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Obtaining the source code & setting up the directory

This exercise is intended to give you practice building the GSI system. This version of GSI system includes a WRF I/O library. There are no need to build the WRF model for this version GSI building.

The community GSI resources, including source code, build system, utilities, and fix files, are available for download from the DTC community GSI users website: http://www.dtcenter.org/com-GSI/users/downloads/index.php

The code downloads will result in the following tar file:

comGSIv3.7_EnKFv1.3.tar.gz

GSI requires use of CRTM coefficients to analyze satellite radiance observations. Due to their large size, these are available as a separate tarfile available for download by selecting the link: CRTM 2.3.0 Big_Endian coefficients tarball

The tars file may be unpacked using the UNIX commands:

tar -zxvf comGSIv3.7_EnKFv1.3.tar.gz

This creates the top level GSI directory: comGSIv3.7_EnKFv1.3