主振荡型（POP）分析的计算程序及其他多种NCL气象程序与数据等

hillside

• 美国NCAR网站的主振荡型（NCL）分析的计算程序及其他软件与数据等。
• 不过，该程序（见于附件,亦可直接点击本帖底端原链接，免费下载）不是由NCAR官方提供。在程序的开始处说明，此程序由某用户提供。
  

NCL Home> Application examples || Data files for some examples
http://www.ncl.ucar.edu/Applications/list_dataP.shtml
Data Analysis Examples
Hints before you start:

• NCL uses an array syntax similar to Fortran-90.
• NCL has 0-based subscripts and the rightmost subscript varies fastest.
• Fortran has 1-based subscripts, and the leftmost subscript varies fastest.
• Do loops should be avoided, since NCL, like Matlab and IDL, is an interpreted language.
  

How to call external Fortran and C routines from NCLThe following pages contain NCL scripts and graphics that you can download and use.

Anomalies Binning Climate Indices Climatology COADS Complex Coefficients (GRIB) CorrelationsDivergent & rotational wind components

ESMF regridding EOFs Equivalent latitudes Filters Fourier Analysis GrADS CTL files Grid_filling Isentropic levels

Local minima and maxima Meridional overturning MJO Clivar NCL system interactions Omega One-dimensional interpolation PDF: Probability Distributions POP: Principal Oscillation Patterns

Random Data to Grid Regression Regridding Sigma coordinate interpolation Space time spectra Spectral analysis Standardized Precipitation Index Time coordinates

Transects Two-point Correlation Vertical interpolation Vorticity Wavelets Weighted averages Zonal

Principal Oscillation Pattern (POP) Analysis

                               
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NCL version 6.1.1 or higher is required to use the code below.
This is user donated code. It is not supported by the NCL developers. Questions and comments can be sent to ncl-talk@ucar.edu. However, responses are not guaranteed.

The scripts below are intended to be 'guide' to usage. They may work directly but, generally, the user will have to make some changes to the scripts.
The following libraries must be loaded prior to use.
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"; download the following by clicking on the textload "PrnOscPat_driver.ncl"load "pltEofPop.ncl"load "pltClim.ncl"
*********************   REFERENCES  *********************von Storch, Hans, Gerd Berger, Reiner Schnur, Jin-Song von Storch, 1995: Principal Oscillation Patterns: A Review. J. Climate, 8, 377鈥�400 *************************************************** Excerpts from the von Storch et al (1995) reference:

"The principal oscillation pattern (POP) analysis is a multivariate technique used to simultaneously infer the characteristic patterns and times cales of a vector time series. The POPs may be seen as the normal modes of a linearized system whose system matrix is estimated from data.[snip]The basic idea is to identify a linear system with a few free parameters that are fitted to the data. Then, the space-time characteristics of this simple systemis regarded as being the same as those of the full system.[snip]The POP method is not a tool that is useful in all applicaations. If theanalyzed vector time series exhibit a strongly nonlinear behavior, the POPsmay fail to identify a useful subsystem. However, if a significant portionof the variability of a nonlinear system is controlled by linear dynamics,the POP analysis may be successful in extracting principal modes of oscillation."

                               
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prn_osc_pat_1.ncl: This performs a POP analysis on Hadley Center monthly sea surface temperatures. The data may be downloaded from: http://www.metoffice.gov.uk/hadobs/hadisst. (You may have to register.)

guoli15

下载下来看看。

zihan6688

不错的东东，收藏。。。谢谢楼主

爱上温哥华

不错的分享，谢谢~已收藏

haohaoai65

谢谢分享，正在研究

niuda

这个POP怎么感觉跟EOF差不多啊

limoxi

这个pop和eif有什么差异吗？

迹。。。忆

感谢分享{:lxm_24:}{:lxm_24:}

zxlzq

谢谢分享，正在研究