Center for Climatic Research: NCL Scripts and Information

NCL Scripts and Information

How to use NCL scripts.
NCL Data Processing Scripts
NCL Functions
NCAR Graphics Documentation: Helpful Links

How to use NCL scripts.

To run a NCL script: Type ncl < scriptname at the Unix prompt. Example: ncl < sfcwind.ncl.
Data indexing in NCL: All indexing starts with 0 (0 ... n -1) -- unlike GrADS, which indexes data sets from 1 (1 ... n). For example, if there are 5 seasons in a data file, NCL indexes them (0:4).

NCL Data Processing Scripts

Note: scripts that have

load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/shea_util.ncl"

at the beginning are meant for use on NCAR computers. If you use these scripts locally, you will need to download the NCL functions.

Calculate SLP (FOAM example)
Unpack netCDF data that has "scale_factor" and "add_offset" attributes and write it to a new file
Make time "unlimited" in a series of netCDF files
Convert Ascii Data to netCDF
Compute Linear Trend Using SST Data
Regrid FOAM Data from R15 Grid to 128x128 Fixed Grid
Regrid NCEP/NCAR Reanalysis Data for Comparison with CCR GCM Output
Read in data from a netCDF file, do some calculations, and write the new variable to a new netCDF file (Genesis LSX example)
Read in data from a netCDF file, do some calculations, and write the new variable to a new netCDF file while making time "unlimited" (Genesis LSX example)
Convert data from modern calendar to celestial calendar (CSM example)
Compute streamfunction, velocity potential, divergence, and vorticity (FOAM example)
Fit POP ocean data to regular lat/lon grid and output to new file

NCL Functions

NCAR Graphics Documentation: Helpful Links

NCAR Graphics index
NCAR Graphics® FAQ
Getting started using NCL - Hints and tips for using NCL
CSM NCL Pages
NCL reference pages
vinth2p, vinth2p_ecmwf (function to convert sigma to pressure levels)
uv2sfvpf, uv2sfvpg (functions to compute stream function and velocity potential)
uv2vrdvf, uv2vrdvg (functions to compute vorticity and divergence)
NCL Graphics Example Pages
NCL Functions and Procedures Organized by Category
File Handling with the CMPS

ABOUT	RESEARCH	RESOURCES
Home About CCR CCR's 50th Anniversary CCR's Mission Personnel CCR News Reid Bryson Scholarship Supporting CCR Job Opportunities Contact Us		Biogeochemistry Climate Impacts Land Surface Processes Oceanography and Limnology Past Climates		CPEP CPEP Seminars Data and Scripts Laboratories Publications

NCL Scripts and Information

Contents

How to use NCL scripts.

NCL Data Processing Scripts

NCL Functions

NCAR Graphics Documentation: Helpful Links