nc格式的fnl文件

zoe_lover

在下载fnl数据的时候在网站上转成了nc格式的数据下载下来，不知道如何处理，很多变量不知道什么意思。

下载了同一时间段的grib2格式的数据，利用兰溪整合的资料生成了CTL文件，具体内容如下：
为什么一种变量有很多种，如下红色标注的部分是什么意思，有什么不同？
在论坛中也看到了一些帖子，但是没能解决问题，麻烦各位大神了。




dset e:/data/fnl_20150623_00_00.grib2
index e:/data/fnl_20150623_00_00.grib2.idx
undef 9.999E+20
title e:/data/fnl_20150623_00_00.grib2
*  produced by g2ctl v0.0.4b
* griddef=1:0:(360 x 181):grid_template=0:winds(N/S): lat-lon grid:(360 x 181) units 1e-06 input WE:NS output WE:SN res 48 lat 90.000000 to -90.000000 by 1.000000 lon 0.000000 to 359.000000 by 1.000000 #points=65160:winds(N/S)

dtype grib2
ydef 181 linear -90.000000 1
xdef 360 linear 0.000000 1.000000
tdef 1 linear 00Z23jun2015 1mo
* PROFILE hPa
zdef 26 levels 100000 97500 95000 92500 90000 85000 80000 75000 70000 65000 60000 55000 50000 45000 40000 35000 30000 25000 20000 15000 10000 7000 5000 3000 2000 1000
options pascals
vars 121
no4LFTXsfc  0,1,0   0,7,193 ** surface none Best (4 layer) Lifted Index [K]
no5WAVH500mb  0,100,50000   0,3,193 ** 500 mb none 5-Wave Geopotential Height [gpm]
ABSVprs   26,100  0,2,10 ** (1000 975 950 925 900.. 70 50 30 20 10) none Absolute Vorticity [1/s]
CAPEsfc  0,1,0   0,7,6 ** surface none Convective Available Potential Energy [J/kg]
CAPE180_0mb 0,108,18000,0   0,7,6 ** 180-0 mb above ground none Convective Available Potential Energy [J/kg]
CAPE255_0mb 0,108,25500,0   0,7,6 ** 255-0 mb above ground none Convective Available Potential Energy [J/kg]
CINsfc  0,1,0   0,7,7 ** surface none Convective Inhibition [J/kg]
CIN180_0mb 0,108,18000,0   0,7,7 ** 180-0 mb above ground none Convective Inhibition [J/kg]
CIN255_0mb 0,108,25500,0   0,7,7 ** 255-0 mb above ground none Convective Inhibition [J/kg]
CLWMRprs   21,100  0,1,22 ** (1000 975 950 925 900.. 300 250 200 150 100) none Cloud Mixing Ratio [kg/kg]
CPOFPsfc  0,1,0   0,1,39 ** surface none Percent frozen precipitation [%]
CWATclm  0,200,0   0,6,6 ** entire atmosphere (considered as a single layer) none Cloud Water [kg/m^2]
DPT2m  0,103,2   0,0,6 ** 2 m above ground none Dew Point Temperature [K]
FIREDLAsfc  0,1,0   2,4,2 ** surface none Fire Outlook Dry Lightning Area [%]
FLDCPsfc  0,1,0   2,3,203 ** surface none Field Capacity [fraction]
GUSTsfc  0,1,0   0,2,22 ** surface none Wind Speed (Gust) [m/s]
HGTsfc  0,1,0   0,3,5 ** surface none Geopotential Height [gpm]
HGTprs   26,100  0,3,5 ** (1000 975 950 925 900.. 70 50 30 20 10) none Geopotential Height [gpm]
HGT2pv  0,109,2e-06   0,3,5 ** PV=2e-06 (Km^2/kg/s) surface none Geopotential Height [gpm]
HGTneg2pv  0,109,-2e-06   0,3,5 ** PV=-2e-06 (Km^2/kg/s) surface none Geopotential Height [gpm]
HGTtop0C  0,204,0   0,3,5 ** highest tropospheric freezing level none Geopotential Height [gpm]
HGT0C  0,4,0   0,3,5 ** 0C isotherm none Geopotential Height [gpm]
HGTmwl  0,6,0   0,3,5 ** max wind none Geopotential Height [gpm]
HGTtrop  0,7,0   0,3,5 ** tropopause none Geopotential Height [gpm]
HLCY3000_0m 0,103,3000,0   0,7,8 ** 3000-0 m above ground none Storm Relative Helicity [m^2/s^2]
HPBLsfc  0,1,0   0,3,196 ** surface none Planetary Boundary Layer Height [m]
ICAHTmwl  0,6,0   0,3,3 ** max wind none ICAO Standard Atmosphere Reference Height [m]
ICAHTtrop  0,7,0   0,3,3 ** tropopause none ICAO Standard Atmosphere Reference Height [m]
ICECsfc  0,1,0   10,2,0 ** surface none Ice Cover [Proportion]
LANDsfc  0,1,0   2,0,0 ** surface none Land Cover (1=land, 0=sea) [Proportion]
LFTXsfc  0,1,0   0,7,192 ** surface none Surface Lifted Index [K]
MSLETmsl  0,101,0   0,3,192 ** mean sea level none MSLP (Eta model reduction) [Pa]
O3MRprs   26,100  0,14,192 ** (400 350 300 250 200.. 70 50 30 20 10) none Ozone Mixing Ratio [kg/kg]
PLPL255_0mb 0,108,25500,0   0,3,200 ** 255-0 mb above ground none Pressure of level from which parcel was lifted [Pa]
POTsig995  0,104,0.995   0,0,2 ** 0.995 sigma level none Potential Temperature [K]
PRESsfc  0,1,0   0,3,0 ** surface none Pressure [Pa]
PRES80m  0,103,80   0,3,0 ** 80 m above ground none Pressure [Pa]
PRES2pv  0,109,2e-06   0,3,0 ** PV=2e-06 (Km^2/kg/s) surface none Pressure [Pa]
PRESneg2pv  0,109,-2e-06   0,3,0 ** PV=-2e-06 (Km^2/kg/s) surface none Pressure [Pa]
PRESmwl  0,6,0   0,3,0 ** max wind none Pressure [Pa]
PREStrop  0,7,0   0,3,0 ** tropopause none Pressure [Pa]
PRMSLmsl  0,101,0   0,3,1 ** mean sea level none Pressure Reduced to MSL [Pa]
PWATclm  0,200,0   0,1,3 ** entire atmosphere (considered as a single layer) none Precipitable Water [kg/m^2]
RHprs   26,100  0,1,1 ** (1000 975 950 925 900.. 70 50 30 20 10) none Relative Humidity [%]
RH2m  0,103,2   0,1,1 ** 2 m above ground none Relative Humidity [%]
RHsg330_1000 0,104,0.33,1   0,1,1 ** 0.33-1 sigma layer none Relative Humidity [%]
RHsg440_1000 0,104,0.44,1   0,1,1 ** 0.44-1 sigma layer none Relative Humidity [%]
RHsg720_940 0,104,0.72,0.94   0,1,1 ** 0.72-0.94 sigma layer none Relative Humidity [%]
RHsg440_720 0,104,0.44,0.72   0,1,1 ** 0.44-0.72 sigma layer none Relative Humidity [%]
RHsig995  0,104,0.995   0,1,1 ** 0.995 sigma level none Relative Humidity [%]
RH30_0mb 0,108,3000,0   0,1,1 ** 30-0 mb above ground none Relative Humidity [%]
RHclm  0,200,0   0,1,1 ** entire atmosphere (considered as a single layer) none Relative Humidity [%]
RHtop0C  0,204,0   0,1,1 ** highest tropospheric freezing level none Relative Humidity [%]
RH0C  0,4,0   0,1,1 ** 0C isotherm none Relative Humidity [%]
SNODsfc  0,1,0   0,1,11 ** surface none Snow Depth [m]
SOILW0_10cm 0,106,0,0.1   2,0,192 ** 0-0.1 m below ground none Volumetric Soil Moisture Content [Fraction]
SOILW10_40cm 0,106,0.1,0.4   2,0,192 ** 0.1-0.4 m below ground none Volumetric Soil Moisture Content [Fraction]
SOILW40_100cm 0,106,0.4,1   2,0,192 ** 0.4-1 m below ground none Volumetric Soil Moisture Content [Fraction]
SOILW100_200cm 0,106,1,2   2,0,192 ** 1-2 m below ground none Volumetric Soil Moisture Content [Fraction]
SPFH2m  0,103,2   0,1,0 ** 2 m above ground none Specific Humidity [kg/kg]
SPFH80m  0,103,80   0,1,0 ** 80 m above ground none Specific Humidity [kg/kg]
SPFH30_0mb 0,108,3000,0   0,1,0 ** 30-0 mb above ground none Specific Humidity [kg/kg]
SUNSDsfc  0,1,0   0,6,201 ** surface none Sunshine Duration
TMPsfc  0,1,0   0,0,0 ** surface none Temperature [K]
TMPprs   26,100  0,0,0 ** (1000 975 950 925 900.. 70 50 30 20 10) none Temperature [K]
TMP_1829m  0,102,1829   0,0,0 ** 1829 m above mean sea level none Temperature [K]
TMP_2743m  0,102,2743   0,0,0 ** 2743 m above mean sea level none Temperature [K]
TMP_3658m  0,102,3658   0,0,0 ** 3658 m above mean sea level none Temperature [K]
TMP2m  0,103,2   0,0,0 ** 2 m above ground none Temperature [K]
TMP80m  0,103,80   0,0,0 ** 80 m above ground none Temperature [K]
TMP100m  0,103,100   0,0,0 ** 100 m above ground none Temperature [K]
TMPsig995  0,104,0.995   0,0,0 ** 0.995 sigma level none Temperature [K]
TMP30_0mb 0,108,3000,0   0,0,0 ** 30-0 mb above ground none Temperature [K]
TMP2pv  0,109,2e-06   0,0,0 ** PV=2e-06 (Km^2/kg/s) surface none Temperature [K]
TMPneg2pv  0,109,-2e-06   0,0,0 ** PV=-2e-06 (Km^2/kg/s) surface none Temperature [K]
TMPmwl  0,6,0   0,0,0 ** max wind none Temperature [K]
TMPtrop  0,7,0   0,0,0 ** tropopause none Temperature [K]
TOZNEclm  0,200,0   0,14,0 ** entire atmosphere (considered as a single layer) none Total Ozone [Dobson]
TSOIL0_10cm 0,106,0,0.1   2,0,2 ** 0-0.1 m below ground none Soil Temperature [K]
TSOIL10_40cm 0,106,0.1,0.4   2,0,2 ** 0.1-0.4 m below ground none Soil Temperature [K]
TSOIL40_100cm 0,106,0.4,1   2,0,2 ** 0.4-1 m below ground none Soil Temperature [K]
TSOIL100_200cm 0,106,1,2   2,0,2 ** 1-2 m below ground none Soil Temperature [K]
UGRDprs   26,100  0,2,2 ** (1000 975 950 925 900.. 70 50 30 20 10) none U-Component of Wind [m/s]
UGRD_1829m  0,102,1829   0,2,2 ** 1829 m above mean sea level none U-Component of Wind [m/s]
UGRD_2743m  0,102,2743   0,2,2 ** 2743 m above mean sea level none U-Component of Wind [m/s]
UGRD_3658m  0,102,3658   0,2,2 ** 3658 m above mean sea level none U-Component of Wind [m/s]
UGRD10m  0,103,10   0,2,2 ** 10 m above ground none U-Component of Wind [m/s]
UGRD80m  0,103,80   0,2,2 ** 80 m above ground none U-Component of Wind [m/s]
UGRD100m  0,103,100   0,2,2 ** 100 m above ground none U-Component of Wind [m/s]
UGRDsig995  0,104,0.995   0,2,2 ** 0.995 sigma level none U-Component of Wind [m/s]
UGRD30_0mb 0,108,3000,0   0,2,2 ** 30-0 mb above ground none U-Component of Wind [m/s]
UGRD2pv  0,109,2e-06   0,2,2 ** PV=2e-06 (Km^2/kg/s) surface none U-Component of Wind [m/s]
UGRDneg2pv  0,109,-2e-06   0,2,2 ** PV=-2e-06 (Km^2/kg/s) surface none U-Component of Wind [m/s]
UGRDpbl  0,220,0   0,2,2 ** planetary boundary layer none U-Component of Wind [m/s]
UGRDmwl  0,6,0   0,2,2 ** max wind none U-Component of Wind [m/s]
UGRDtrop  0,7,0   0,2,2 ** tropopause none U-Component of Wind [m/s]
USTM6000_0m 0,103,6000,0   0,2,194 ** 6000-0 m above ground none U-Component Storm Motion [m/s]
VGRDprs   26,100  0,2,3 ** (1000 975 950 925 900.. 70 50 30 20 10) none V-Component of Wind [m/s]
VGRD_1829m  0,102,1829   0,2,3 ** 1829 m above mean sea level none V-Component of Wind [m/s]
VGRD_2743m  0,102,2743   0,2,3 ** 2743 m above mean sea level none V-Component of Wind [m/s]
VGRD_3658m  0,102,3658   0,2,3 ** 3658 m above mean sea level none V-Component of Wind [m/s]
VGRD10m  0,103,10   0,2,3 ** 10 m above ground none V-Component of Wind [m/s]
VGRD80m  0,103,80   0,2,3 ** 80 m above ground none V-Component of Wind [m/s]
VGRD100m  0,103,100   0,2,3 ** 100 m above ground none V-Component of Wind [m/s]
VGRDsig995  0,104,0.995   0,2,3 ** 0.995 sigma level none V-Component of Wind [m/s]
VGRD30_0mb 0,108,3000,0   0,2,3 ** 30-0 mb above ground none V-Component of Wind [m/s]
VGRD2pv  0,109,2e-06   0,2,3 ** PV=2e-06 (Km^2/kg/s) surface none V-Component of Wind [m/s]
VGRDneg2pv  0,109,-2e-06   0,2,3 ** PV=-2e-06 (Km^2/kg/s) surface none V-Component of Wind [m/s]
VGRDpbl  0,220,0   0,2,3 ** planetary boundary layer none V-Component of Wind [m/s]
VGRDmwl  0,6,0   0,2,3 ** max wind none V-Component of Wind [m/s]
VGRDtrop  0,7,0   0,2,3 ** tropopause none V-Component of Wind [m/s]
VRATEpbl  0,220,0   0,2,224 ** planetary boundary layer none Ventilation Rate [m2/s]
VSTM6000_0m 0,103,6000,0   0,2,195 ** 6000-0 m above ground none V-Component Storm Motion [m/s]
VVELprs   21,100  0,2,8 ** (1000 975 950 925 900.. 300 250 200 150 100) none Vertical Velocity (Pressure) [Pa/s]
VVELsig995  0,104,0.995   0,2,8 ** 0.995 sigma level none Vertical Velocity (Pressure) [Pa/s]
VWSH2pv  0,109,2e-06   0,2,192 ** PV=2e-06 (Km^2/kg/s) surface none Vertical speed sheer [1/s]
VWSHneg2pv  0,109,-2e-06   0,2,192 ** PV=-2e-06 (Km^2/kg/s) surface none Vertical speed sheer [1/s]
VWSHtrop  0,7,0   0,2,192 ** tropopause none Vertical speed sheer [1/s]
WEASDsfc  0,1,0   0,1,13 ** surface none Water Equivalent of Accumulated Snow Depth [kg/m^2]
WILTsfc  0,1,0   2,0,201 ** surface none Wilting Point [Fraction]
var00212m  0,103,2   0,0,21 ** 2 m above ground none desc [unit]
ENDVARS

MeteoInfo

nc文件是自描述文件，可以用ncdump之类的工具看数据的信息。