Community Gridpoint Statistical Interpolation System
Welcome to the users page for the Community Gridpoint Statistical Interpolation (GSI) system. The GSI system is a variational data assimilation system. It is designed to be a flexible, state-of-art system that is efficient on available parallel computing platforms. The GSI system is in the public domain and is freely available for community use.
The Developmental Testbed Center (DTC) currently maintains and supports a community version of the GSI system (now at Version 3.0). The testing and support of this GSI system at the DTC currently focus on limited area numerical weather prediction (NWP) applications coupled with the Weather Research and Forecasting (WRF) Model , but this sytem may be applied to global forecast applications as well as other modelling systems. The following lists some of new functions and changes included in the release version 3.0 of the GSI:
- Improve current use of satellite data
- SST updating and direct assimilation of radiances for SST
- Update observation error statistic and background error statistics
- Inclusion of ASCAT data
- Include GOES wind thinning - improve QC and observation error specification for all satellite winds
- Update ozone assimilation
- Assimilating tropical storm pseudo sea-level pressure observations
- Features to use hybrid ensemble/var data assimilation
- Bundle to set state and control vector flexible
- Inclusion of GSD cloud analysis scheme
- Inclusion of PM2.5 data analysis with CMAQ background
- Fix and improve GPS bending angle assimilation
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