[Gsi_news] Announcing GSI Version 3.1 Release

Hui Shao huishao at ucar.edu
Fri Jul 20 12:21:54 MDT 2012

The Developmental Testbed Center (DTC) is pleased to announce the release of Version 3.1 of the Community Gridpoint Statistical Interpolation (GSI) data assimilation system. The new GSI code, its support libraries, and documentation can be obtained at: 

This version of the GSI code is based on the GSI community trunk and National Centers for Environmental Prediction (NCEP) operational trunk from May 2012. New functions and changes included in the released code are in various areas, including:

* Development of new data assimilation techniques, such as enhancement of hybrid capabilities and additional features for cloudy radiance assimilation.
* Improvement to general data analysis techniques, such as adding the Bi-Conjugate Gradient minimization option, including the NCEP’s latest Radiance Monitoring package, and improving the cloud analysis scheme and surface data assimilation analysis. 
* Improvement to the use of observations and addition of new observations. Some of the observations involved are, but are not limited to: GPS-RO, CO2, ATMS, PM2.5, MODIS AOD, Doppler wind Lidar data, MLS ozone, and SEVIRI data.

A detailed release note can be found at: 
and a complete list of the observation data that can be used in GSI can be found at: 

Basic skills applying this version of GSI as well as other advanced applications of GSI will be introduced during the upcoming annual GSI tutorial at NCAR held on August 21-23, 2012. For details, please check:

Please send questions and comments to gsi_help at ucar.edu.

This release is the result of the joint efforts of National Oceanic and Atmospheric Administration (NOAA)/NCEP and DTC through the support of NOAA, the U.S. Air Force Weather Agency (AFWA), and the National Science Foundation (NSF).

DTC Data Assimilation Team

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