NCL计算涡度问题，请各位大神指导一下

liyuanliu2012 · 发表于 2015-10-1 11:53:56

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本帖最后由 liyuanliu2012 于 2015-10-1 11:58 编辑

请教各位大神，我准备分析一个台风的涡度场，资料用的是NCEP FNL 1x1的，在使用NCL自带函数的时候发现数值严重偏小，而且形状很奇怪。然后使用它原本数据中的绝对涡度也发现有问题，它的单位是S-1，但是里面的数据却很小（和一般使用的e-5s-1相比应该是乘以了1e05，但是数据还是很小，不知道是不是两个数据就不是一个东西，涡度和绝对涡度？）。麻烦各位指导一下，谢谢啦!
这个是用NCL函数算涡度的代码：

load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
;************************************************
begin
;************************************************
; read in grib2 file
;************************************************

  time = "20150809_12_00"

  filename = time+".grib2"

  picname = "vort_500_"+time+"_01"
;  title =

  a = addfile("./data/fnl_"+filename,"r")
;************************************************
; read in  data
;************************************************

  u = a->UGRD_P0_L100_GLL0({50000},:,:)

  v = a->VGRD_P0_L100_GLL0({50000},:,:)    ; read U/V data

  scale=1.e05

  vort = scale*uv2vr_cfd(u,v,u&lat_0,u&lon_0,2)

;************************************************
; create plot
;************************************************
  wks = gsn_open_wks("png",picname)             ; open a png file

  cnres                         = True                         ; plot mods desired
  cnres@gsnFrame                = False
  cnres@gsnDraw                = False
  cnres@gsnMaximize             = True
  cnres@gsnRightString          = " "          ; turn off right string
  cnres@gsnLeftString          = " "          ; turn off left string
;  cnres@tiXAxisString          = " "
;----------------------------------map plot--------------------------------

  mpres = cnres

;---Zoom in on area of interest

  mpres@mpLimitMode          = "LatLon"

  mpres@mpMinLatF             = 10.

  mpres@mpMaxLatF             = 50.

  mpres@mpMinLonF             = 100.

  mpres@mpMaxLonF             = 140.

  mpres@mpDataBaseVersion    = "MediumRes"

  mpres@mpDataSetName          = "Earth..4"

  mpres@mpOutlineOn          = True       ; Turn on map outlines

  mpres@mpOutlineSpecifiers    = (/"China","Taiwan","Zhejiang"/)    ;China:states

  mpres@mpLandFillColor       = "white"

  mpres@mpInlandWaterFillColor  = "white"

  mpres@mpOceanFillColor       = "white"

  mpres@gsnMajorLatSpacing    = 10.

  mpres@gsnMajorLonSpacing    = 10.          ; 设置高级绘图窗口gsn中经纬度刻度的间隔

  mpres@tmXTOn                = False       ;不显示X轴顶部的坐标刻度

  mpres@tmYROn                = False       ;不显示Y轴右侧的坐标刻度

  mpplot=gsn_csm_map(wks,mpres)

;----------------------------- contour plot--------------------------------------

  cnres@gsnAddCyclic = False

  cnres@cnLevelSelectionMode = "ManualLevels"    ; set manual contour levels

  cnres@cnMinLevelValF    = 0.             ; set min contour level

  cnres@cnMaxLevelValF    = 40.             ; set max contour level

  cnres@cnLevelSpacingF    = 1.             ; set contour spacing

  cnres@tiMainString       = picname ; plot title

  cnres@cnLineThicknessF    = 2.

  cnres@cnInfoLabelOn       = False          ;去除cnplot右下角的信息标签InfoLabel

  cnres@vpXF = 0    ;左边距

  cnres@vpYF = 0    ;上边距

  cnres@vpWidthF  = 1.0             ; height and width of plot

  cnres@vpHeightF = 1.0

;  cnres@cnSmoothingOn       = True

  cnplot = gsn_csm_contour(wks,vort,cnres)  ; create plot

;--------------------------- draw plot and fram wks------------------------------

  overlay(mpplot,cnplot)

  draw(mpplot)

  frame(wks)
end
结果：

NCEP绝对涡度的就是用vort = f->ABSV_P0_L100_GLL0({50000},:,:)替换了上面代码中计算涡度的部分，其他都相同

MeteroCl · 发表于 2015-10-2 08:08:42

绝对涡度等于相对涡度加上地转涡度，我们平时说的涡度一般都是数值乘上10-5这个量级，台风涡度场应该指的是相对涡度，需用绝对涡度减去地转涡度F（原数据中有）

风子 · 发表于 2015-10-2 09:26:32

是不是文件中的数据类型是short型，而你读取后没转float ?

liyuanliu2012 · 发表于 2015-10-2 09:39:03

MeteroCl 发表于 2015-10-2 08:08
绝对涡度等于相对涡度加上地转涡度，我们平时说的涡度一般都是数值乘上10-5这个量级，台风涡度场应该指的是 ...

谢谢指导，有点懂了，天原学的渣啊

可以再请教一下么，我在数据里面又找了几次也没发现地转涡度，还是只发现了原来的那个绝对涡度 float ABSV_P0_L100_GLL0 ( lv_ISBL0, lat_0, lon_0 )，请问下，地转涡度是哪个变量啊

liyuanliu2012 · 发表于 2015-10-2 09:47:50

风子发表于 2015-10-2 09:26
是不是文件中的数据类型是short型，而你读取后没转float ?

貌似不是这个问题，我看了下，数据都是float型的

MeteroCl · 发表于 2015-10-3 17:15:15

liyuanliu2012 发表于 2015-10-2 09:39
谢谢指导，有点懂了，天原学的渣啊
可以再请教一下么，我在数据里面又找了几次也没发现地转 ...

就是有个量F（下面解释说是科里奥利参数）..

liyuanliu2012 · 发表于 2015-10-10 10:17:33

不好意思，我仔细看了一下数据文件中的各个变量，始终没有发现你说的地转参数，下面我把数据文件的说明贴出来了，麻烦你看下，是数据的问题么？还是你是在其他数据中看到的？

Copyright (C) 1995-2013 - All Rights Reserved
University Corporation for Atmospheric Research
NCAR Command Language Version 6.1.2
The use of this software is governed by a License Agreement.
See http://www.ncl.ucar.edu/ for more details.
warning: Entry (21) not found in code table file /usr/local/lib/ncarg/grib2_codetables/ncep/4/4.2.0.0.table

Variable: f
Type: file
filename: fnl_20150810_12_00
path: ./data/fnl_20150810_12_00.grib2
file global attributes:
dimensions:
   lat_0 = 181
   lon_0 = 360
   lv_ISBL0 = 26
   lv_AMSL1 = 3
   lv_HTGL2 = 3
   lv_PVL3 = 2
   lv_HTGL4 = 2
   lv_SIGL5 = 4
   lv_ISBL6 = 21
   lv_HTGL7 = 3
   lv_SPDL8 = 2
   lv_ISBL9 = 12
   lv_DBLL10 = 4
variables:
   float TMP_P0_L1_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Temperature
      units : K
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Temperature
      parameter_template_discipline_category_number : ( 0, 0, 0, 0 )
      level_type : Ground or water surface
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float TMP_P0_L6_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Temperature
      units : K
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Temperature
      parameter_template_discipline_category_number : ( 0, 0, 0, 0 )
      level_type : Maximum wind level
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float TMP_P0_L7_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Temperature
      units : K
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Temperature
      parameter_template_discipline_category_number : ( 0, 0, 0, 0 )
      level_type : Tropopause
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float TMP_P0_L100_GLL0 ( lv_ISBL0, lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Temperature
      units : K
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Temperature
      parameter_template_discipline_category_number : ( 0, 0, 0, 0 )
      level_type : Isobaric surface (Pa)
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float TMP_P0_L102_GLL0 ( lv_AMSL1, lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Temperature
      units : K
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Temperature
      parameter_template_discipline_category_number : ( 0, 0, 0, 0 )
      level_type : Specific altitude above mean sea level (m)
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float TMP_P0_L103_GLL0 ( lv_HTGL2, lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Temperature
      units : K
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Temperature
      parameter_template_discipline_category_number : ( 0, 0, 0, 0 )
      level_type : Specified height level above ground (m)
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float TMP_P0_L104_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Temperature
      units : K
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Temperature
      parameter_template_discipline_category_number : ( 0, 0, 0, 0 )
      level_type : Sigma level (sigma value)
      level : 0.995
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float TMP_P0_2L108_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Temperature
      units : K
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Temperature
      parameter_template_discipline_category_number : ( 0, 0, 0, 0 )
      level_type : Level at specified pressure difference from ground to level (Pa)
      level : ( 3000,  0 )
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float TMP_P0_L109_GLL0 ( lv_PVL3, lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Temperature
      units : K
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Temperature
      parameter_template_discipline_category_number : ( 0, 0, 0, 0 )
      level_type : Potential vorticity (K m2 kg-1 s-1)
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float POT_P0_L104_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Potential temperature
      units : K
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Temperature
      parameter_template_discipline_category_number : ( 0, 0, 0, 2 )
      level_type : Sigma level (sigma value)
      level : 0.995
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float DPT_P0_L103_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Dew point temperature
      units : K
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Temperature
      parameter_template_discipline_category_number : ( 0, 0, 0, 6 )
      level_type : Specified height level above ground (m)
      level :    2
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float VAR_0_0_21_P0_L103_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : unknown variable name
      units : unknown
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Temperature
      parameter_template_discipline_category_number : ( 0, 0, 0, 21 )
      level_type : Specified height level above ground (m)
      level :    2
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float SPFH_P0_L103_GLL0 ( lv_HTGL4, lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Specific humidity
      units : kg kg-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Moisture
      parameter_template_discipline_category_number : ( 0, 0, 1, 0 )
      level_type : Specified height level above ground (m)
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float SPFH_P0_2L108_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Specific humidity
      units : kg kg-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Moisture
      parameter_template_discipline_category_number : ( 0, 0, 1, 0 )
      level_type : Level at specified pressure difference from ground to level (Pa)
      level : ( 3000,  0 )
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float RH_P0_L4_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Relative humidity
      units : %
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Moisture
      parameter_template_discipline_category_number : ( 0, 0, 1, 1 )
      level_type : Level of 0o C isotherm
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float RH_P0_L100_GLL0 ( lv_ISBL0, lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Relative humidity
      units : %
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Moisture
      parameter_template_discipline_category_number : ( 0, 0, 1, 1 )
      level_type : Isobaric surface (Pa)
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float RH_P0_L103_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Relative humidity
      units : %
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Moisture
      parameter_template_discipline_category_number : ( 0, 0, 1, 1 )
      level_type : Specified height level above ground (m)
      level :    2
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float RH_P0_2L104_GLL0 ( lv_SIGL5, lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Relative humidity
      units : %
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Moisture
      parameter_template_discipline_category_number : ( 0, 0, 1, 1 )
      level_type : Sigma level (sigma value)
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float RH_P0_L104_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Relative humidity
      units : %
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Moisture
      parameter_template_discipline_category_number : ( 0, 0, 1, 1 )
      level_type : Sigma level (sigma value)
      level : 0.995
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float RH_P0_2L108_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Relative humidity
      units : %
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Moisture
      parameter_template_discipline_category_number : ( 0, 0, 1, 1 )
      level_type : Level at specified pressure difference from ground to level (Pa)
      level : ( 3000,  0 )
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float RH_P0_L200_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Relative humidity
      units : %
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Moisture
      parameter_template_discipline_category_number : ( 0, 0, 1, 1 )
      level_type : Entire atmosphere (considered as a single layer)
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float RH_P0_L204_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Relative humidity
      units : %
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Moisture
      parameter_template_discipline_category_number : ( 0, 0, 1, 1 )
      level_type : Highest tropospheric freezing level
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float PWAT_P0_L200_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Precipitable water
      units : kg m-2
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Moisture
      parameter_template_discipline_category_number : ( 0, 0, 1, 3 )
      level_type : Entire atmosphere (considered as a single layer)
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float SNOD_P0_L1_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Snow depth
      units : m
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Moisture
      parameter_template_discipline_category_number : ( 0, 0, 1, 11 )
      level_type : Ground or water surface
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float WEASD_P0_L1_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Water equivalent of accumulated snow depth
      units : kg m-2
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Moisture
      parameter_template_discipline_category_number : ( 0, 0, 1, 13 )
      level_type : Ground or water surface
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float CLWMR_P0_L100_GLL0 ( lv_ISBL6, lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Cloud mixing ratio
      units : kg kg-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Moisture
      parameter_template_discipline_category_number : ( 0, 0, 1, 22 )
      level_type : Isobaric surface (Pa)
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float CPOFP_P0_L1_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Percent frozen precipitation
      units : %
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Moisture
      parameter_template_discipline_category_number : ( 0, 0, 1, 39 )
      level_type : Ground or water surface
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float UGRD_P0_L6_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : U-component of wind
      units : m s-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Momentum
      parameter_template_discipline_category_number : ( 0, 0, 2, 2 )
      level_type : Maximum wind level
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float UGRD_P0_L7_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : U-component of wind
      units : m s-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Momentum
      parameter_template_discipline_category_number : ( 0, 0, 2, 2 )
      level_type : Tropopause
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float UGRD_P0_L100_GLL0 ( lv_ISBL0, lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : U-component of wind
      units : m s-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Momentum
      parameter_template_discipline_category_number : ( 0, 0, 2, 2 )
      level_type : Isobaric surface (Pa)
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float UGRD_P0_L102_GLL0 ( lv_AMSL1, lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : U-component of wind
      units : m s-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Momentum
      parameter_template_discipline_category_number : ( 0, 0, 2, 2 )
      level_type : Specific altitude above mean sea level (m)
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float UGRD_P0_L103_GLL0 ( lv_HTGL7, lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : U-component of wind
      units : m s-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Momentum
      parameter_template_discipline_category_number : ( 0, 0, 2, 2 )
      level_type : Specified height level above ground (m)
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float UGRD_P0_L104_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : U-component of wind
      units : m s-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Momentum
      parameter_template_discipline_category_number : ( 0, 0, 2, 2 )
      level_type : Sigma level (sigma value)
      level : 0.995
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float UGRD_P0_2L108_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : U-component of wind
      units : m s-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Momentum
      parameter_template_discipline_category_number : ( 0, 0, 2, 2 )
      level_type : Level at specified pressure difference from ground to level (Pa)
      level : ( 3000,  0 )
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float UGRD_P0_L109_GLL0 ( lv_PVL3, lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : U-component of wind
      units : m s-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Momentum
      parameter_template_discipline_category_number : ( 0, 0, 2, 2 )
      level_type : Potential vorticity (K m2 kg-1 s-1)
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float UGRD_P0_L220_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : U-component of wind
      units : m s-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Momentum
      parameter_template_discipline_category_number : ( 0, 0, 2, 2 )
      level_type : Planetary boundary layer
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float VGRD_P0_L6_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : V-component of wind
      units : m s-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Momentum
      parameter_template_discipline_category_number : ( 0, 0, 2, 3 )
      level_type : Maximum wind level
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float VGRD_P0_L7_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : V-component of wind
      units : m s-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Momentum
      parameter_template_discipline_category_number : ( 0, 0, 2, 3 )
      level_type : Tropopause
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float VGRD_P0_L100_GLL0 ( lv_ISBL0, lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : V-component of wind
      units : m s-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Momentum
      parameter_template_discipline_category_number : ( 0, 0, 2, 3 )
      level_type : Isobaric surface (Pa)
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float VGRD_P0_L102_GLL0 ( lv_AMSL1, lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : V-component of wind
      units : m s-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Momentum
      parameter_template_discipline_category_number : ( 0, 0, 2, 3 )
      level_type : Specific altitude above mean sea level (m)
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float VGRD_P0_L103_GLL0 ( lv_HTGL7, lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : V-component of wind
      units : m s-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Momentum
      parameter_template_discipline_category_number : ( 0, 0, 2, 3 )
      level_type : Specified height level above ground (m)
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float VGRD_P0_L104_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : V-component of wind
      units : m s-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Momentum
      parameter_template_discipline_category_number : ( 0, 0, 2, 3 )
      level_type : Sigma level (sigma value)
      level : 0.995
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float VGRD_P0_2L108_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : V-component of wind
      units : m s-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Momentum
      parameter_template_discipline_category_number : ( 0, 0, 2, 3 )
      level_type : Level at specified pressure difference from ground to level (Pa)
      level : ( 3000,  0 )
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float VGRD_P0_L109_GLL0 ( lv_PVL3, lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : V-component of wind
      units : m s-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Momentum
      parameter_template_discipline_category_number : ( 0, 0, 2, 3 )
      level_type : Potential vorticity (K m2 kg-1 s-1)
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float VGRD_P0_L220_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : V-component of wind
      units : m s-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Momentum
      parameter_template_discipline_category_number : ( 0, 0, 2, 3 )
      level_type : Planetary boundary layer
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float VVEL_P0_L100_GLL0 ( lv_ISBL6, lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Vertical velocity (pressure)
      units : Pa s-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Momentum
      parameter_template_discipline_category_number : ( 0, 0, 2, 8 )
      level_type : Isobaric surface (Pa)
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float VVEL_P0_L104_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Vertical velocity (pressure)
      units : Pa s-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Momentum
      parameter_template_discipline_category_number : ( 0, 0, 2, 8 )
      level_type : Sigma level (sigma value)
      level : 0.995
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float ABSV_P0_L100_GLL0 ( lv_ISBL0, lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Absolute vorticity
      units : s-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Momentum
      parameter_template_discipline_category_number : ( 0, 0, 2, 10 )
      level_type : Isobaric surface (Pa)
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float GUST_P0_L1_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Wind speed (gust)
      units : m s-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Momentum
      parameter_template_discipline_category_number : ( 0, 0, 2, 22 )
      level_type : Ground or water surface
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float VWSH_P0_L7_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Vertical speed sheer
      units : s-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Momentum
      parameter_template_discipline_category_number : ( 0, 0, 2, 192 )
      level_type : Tropopause
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float VWSH_P0_L109_GLL0 ( lv_PVL3, lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Vertical speed sheer
      units : s-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Momentum
      parameter_template_discipline_category_number : ( 0, 0, 2, 192 )
      level_type : Potential vorticity (K m2 kg-1 s-1) 位势涡度
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float USTM_P0_2L103_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : U-component storm motion
      units : m s-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Momentum
      parameter_template_discipline_category_number : ( 0, 0, 2, 194 )
      level_type : Specified height level above ground (m)
      level : ( 6000,  0 )
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float VSTM_P0_2L103_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : V-component storm motion
      units : m s-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Momentum
      parameter_template_discipline_category_number : ( 0, 0, 2, 195 )
      level_type : Specified height level above ground (m)
      level : ( 6000,  0 )
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float VRATE_P0_L220_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Ventilation rate
      units : m2/s
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Momentum
      parameter_template_discipline_category_number : ( 0, 0, 2, 224 )
      level_type : Planetary boundary layer
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float PRES_P0_L1_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Pressure
      units : Pa
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Mass
      parameter_template_discipline_category_number : ( 0, 0, 3, 0 )
      level_type : Ground or water surface
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float PRES_P0_L6_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Pressure
      units : Pa
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Mass
      parameter_template_discipline_category_number : ( 0, 0, 3, 0 )
      level_type : Maximum wind level
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float PRES_P0_L7_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Pressure
      units : Pa
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Mass
      parameter_template_discipline_category_number : ( 0, 0, 3, 0 )
      level_type : Tropopause
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float PRES_P0_L103_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Pressure
      units : Pa
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Mass
      parameter_template_discipline_category_number : ( 0, 0, 3, 0 )
      level_type : Specified height level above ground (m)
      level : 80
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float PRES_P0_L109_GLL0 ( lv_PVL3, lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Pressure
      units : Pa
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Mass
      parameter_template_discipline_category_number : ( 0, 0, 3, 0 )
      level_type : Potential vorticity (K m2 kg-1 s-1)
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float PRMSL_P0_L101_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Pressure reduced to MSL
      units : Pa
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Mass
      parameter_template_discipline_category_number : ( 0, 0, 3, 1 )
      level_type : Mean sea level (Pa)
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float ICAHT_P0_L6_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : ICAO standard atmosphere reference height
      units : m
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Mass
      parameter_template_discipline_category_number : ( 0, 0, 3, 3 )
      level_type : Maximum wind level
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float ICAHT_P0_L7_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : ICAO standard atmosphere reference height
      units : m
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Mass
      parameter_template_discipline_category_number : ( 0, 0, 3, 3 )
      level_type : Tropopause
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float HGT_P0_L1_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Geopotential height
      units : gpm
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Mass
      parameter_template_discipline_category_number : ( 0, 0, 3, 5 )
      level_type : Ground or water surface
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float HGT_P0_L4_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Geopotential height
      units : gpm
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Mass
      parameter_template_discipline_category_number : ( 0, 0, 3, 5 )
      level_type : Level of 0o C isotherm
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float HGT_P0_L6_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Geopotential height
      units : gpm
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Mass
      parameter_template_discipline_category_number : ( 0, 0, 3, 5 )
      level_type : Maximum wind level
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float HGT_P0_L7_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Geopotential height
      units : gpm
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Mass
      parameter_template_discipline_category_number : ( 0, 0, 3, 5 )
      level_type : Tropopause
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float HGT_P0_L100_GLL0 ( lv_ISBL0, lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Geopotential height
      units : gpm
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Mass
      parameter_template_discipline_category_number : ( 0, 0, 3, 5 )
      level_type : Isobaric surface (Pa)
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float HGT_P0_L109_GLL0 ( lv_PVL3, lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Geopotential height
      units : gpm
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Mass
      parameter_template_discipline_category_number : ( 0, 0, 3, 5 )
      level_type : Potential vorticity (K m2 kg-1 s-1)
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float HGT_P0_L204_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Geopotential height
      units : gpm
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Mass
      parameter_template_discipline_category_number : ( 0, 0, 3, 5 )
      level_type : Highest tropospheric freezing level
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float MSLET_P0_L101_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : MSLP (Eta model reduction)
      units : Pa
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Mass
      parameter_template_discipline_category_number : ( 0, 0, 3, 192 )
      level_type : Mean sea level (Pa)
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float 5WAVH_P0_L100_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : 5-wave geopotential height
      units : gpm
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Mass
      parameter_template_discipline_category_number : ( 0, 0, 3, 193 )
      level_type : Isobaric surface (Pa)
      level : 50000
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float HPBL_P0_L1_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Planetary boundary layer height
      units : m
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Mass
      parameter_template_discipline_category_number : ( 0, 0, 3, 196 )
      level_type : Ground or water surface
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float PLPL_P0_2L108_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Pressure of level from which parcel was lifted
      units : Pa
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Mass
      parameter_template_discipline_category_number : ( 0, 0, 3, 200 )
      level_type : Level at specified pressure difference from ground to level (Pa)
      level : ( 25500,  0 )
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float CWAT_P0_L200_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Cloud water
      units : kg m-2
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Cloud
      parameter_template_discipline_category_number : ( 0, 0, 6, 6 )
      level_type : Entire atmosphere (considered as a single layer)
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float SUNSD_P0_L1_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Sunshine duration
      units : s
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Cloud
      parameter_template_discipline_category_number : ( 0, 0, 6, 201 )
      level_type : Ground or water surface
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float CAPE_P0_L1_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Convective available potential energy
      units : J kg-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Thermodynamic stability indices
      parameter_template_discipline_category_number : ( 0, 0, 7, 6 )
      level_type : Ground or water surface
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float CAPE_P0_2L108_GLL0 ( lv_SPDL8, lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Convective available potential energy
      units : J kg-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Thermodynamic stability indices
      parameter_template_discipline_category_number : ( 0, 0, 7, 6 )
      level_type : Level at specified pressure difference from ground to level (Pa)
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float CIN_P0_L1_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Convective inhibition 对流抑制
      units : J kg-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Thermodynamic stability indices
      parameter_template_discipline_category_number : ( 0, 0, 7, 7 )
      level_type : Ground or water surface
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float CIN_P0_2L108_GLL0 ( lv_SPDL8, lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Convective inhibition
      units : J kg-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Thermodynamic stability indices
      parameter_template_discipline_category_number : ( 0, 0, 7, 7 )
      level_type : Level at specified pressure difference from ground to level (Pa)
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float HLCY_P0_2L103_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Storm relative helicity 风暴相对螺旋度
      units : m2 s-2
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Thermodynamic stability indices
      parameter_template_discipline_category_number : ( 0, 0, 7, 8 )
      level_type : Specified height level above ground (m)
      level : ( 3000,  0 )
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float LFTX_P0_L1_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Surface lifted index
      units : K
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Thermodynamic stability indices
      parameter_template_discipline_category_number : ( 0, 0, 7, 192 )
      level_type : Ground or water surface
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float 4LFTX_P0_L1_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Best (4 layer) lifted index
      units : K
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Thermodynamic stability indices
      parameter_template_discipline_category_number : ( 0, 0, 7, 193 )
      level_type : Ground or water surface
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float TOZNE_P0_L200_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Total ozone
      units : Dobson
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Trace gases (e.g. ozone, CO2)
      parameter_template_discipline_category_number : ( 0, 0, 14, 0 )
      level_type : Entire atmosphere (considered as a single layer)
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float O3MR_P0_L100_GLL0 ( lv_ISBL9, lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Ozone mixing ratio
      units : kg kg-1
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Meteorological products, Trace gases (e.g. ozone, CO2)
      parameter_template_discipline_category_number : ( 0, 0, 14, 192 )
      level_type : Isobaric surface (Pa)
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float LAND_P0_L1_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Land cover (1=land, 0=sea)
      units : Proportion
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Land surface products, Vegetation/biomass
      parameter_template_discipline_category_number : ( 0, 2, 0, 0 )
      level_type : Ground or water surface
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float TSOIL_P0_2L106_GLL0 ( lv_DBLL10, lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Soil temperature
      units : K
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Land surface products, Vegetation/biomass
      parameter_template_discipline_category_number : ( 0, 2, 0, 2 )
      level_type : Depth below land surface (m)
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float SOILW_P0_2L106_GLL0 ( lv_DBLL10, lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Volumetric soil moisture content 土壤体积含水量
      units : Fraction
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Land surface products, Vegetation/biomass
      parameter_template_discipline_category_number : ( 0, 2, 0, 192 )
      level_type : Depth below land surface (m)
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float WILT_P0_L1_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Wilting point
      units : Fraction
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Land surface products, Vegetation/biomass
      parameter_template_discipline_category_number : ( 0, 2, 0, 201 )
      level_type : Ground or water surface
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float FLDCP_P0_L1_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Field capacity 田间含水量
      units : fraction
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Land surface products, Soil products
      parameter_template_discipline_category_number : ( 0, 2, 3, 203 )
      level_type : Ground or water surface
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float HINDEX_P0_L1_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Haines index 海恩斯指数
      units : Numeric
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Land surface products, Fire weather
      parameter_template_discipline_category_number : ( 0, 2, 4, 2 )
      level_type : Ground or water surface
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float ICEC_P0_L1_GLL0 ( lat_0, lon_0 )
      center : US National Weather Service - NCEP (WMC)
      production_status : Operational products
      long_name : Ice cover
      units : Proportion
      _FillValue : 1e+20
      grid_type : Latitude/longitude
      parameter_discipline_and_category : Oceanographic products, Ice
      parameter_template_discipline_category_number : ( 0, 10, 2, 0 )
      level_type : Ground or water surface
      level :    0
      forecast_time : 0
      forecast_time_units : hours
      initial_time : 08/10/2015 (12:00)

   float lv_DBLL10_l1 ( lv_DBLL10 )
      long_name : Depth below land surface
      units : m

   float lv_DBLL10_l0 ( lv_DBLL10 )
      long_name : Depth below land surface
      units : m

   float lv_ISBL9 ( lv_ISBL9 )
      long_name : Isobaric surface
      units : Pa

   float lv_SPDL8_l1 ( lv_SPDL8 )
      long_name : Level at specified pressure difference from ground to level
      units : Pa

   float lv_SPDL8_l0 ( lv_SPDL8 )
      long_name : Level at specified pressure difference from ground to level
      units : Pa

   float lv_HTGL7 ( lv_HTGL7 )
      long_name : Specified height level above ground
      units : m

   float lv_ISBL6 ( lv_ISBL6 )
      long_name : Isobaric surface
      units : Pa

   float lv_SIGL5_l1 ( lv_SIGL5 )
      long_name : Sigma level (sigma value)
      units : none

   float lv_SIGL5_l0 ( lv_SIGL5 )
      long_name : Sigma level (sigma value)
      units : none

   float lv_HTGL4 ( lv_HTGL4 )
      long_name : Specified height level above ground
      units : m

   float lv_PVL3 ( lv_PVL3 )
      long_name : Potential vorticity
      units : K m2 kg-1 s-1

   float lv_HTGL2 ( lv_HTGL2 )
      long_name : Specified height level above ground
      units : m

   float lv_AMSL1 ( lv_AMSL1 )
      long_name : Specific altitude above mean sea level
      units : m

   float lv_ISBL0 ( lv_ISBL0 )
      long_name : Isobaric surface
      units : Pa

   float lat_0 ( lat_0 )
      long_name : latitude
      grid_type : Latitude/Longitude
      units : degrees_north
      Dj :    1
      Di :    1
      Lo2 : 359
      La2 : -90
      Lo1 :    0
      La1 : 90

   float lon_0 ( lon_0 )
      long_name : longitude
      grid_type : Latitude/Longitude
      units : degrees_east
      Dj :    1
      Di :    1
      Lo2 : 359
      La2 : -90
      Lo1 :    0
      La1 : 90

fishcy413 · 发表于 2015-10-19 15:40:48

正好我也要算相对涡度~~参考了~

jiaohe1990 · 发表于 2015-11-2 22:26:04

顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶

d1268y · 发表于 2016-1-30 14:07:08

Thanks a lot!

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[作图] NCL计算涡度问题，请各位大神指导一下

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