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 2.0). 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 is a list of new functions and changes included in the NCEP operational global implementation version of the GSI:
- Assimilating tropical storm pseudo sea-level pressure observations
- Assimilating NOAA-19 HIRS/4 and AMSU-A brightness temperature observations
- Assimilating RARS 1B data
- Assimilating NOAA-18 SBUV/2 and AURA OMI Ozone observations. Monitor NOAA-19 and METOP-2 GOME Ozone observations
- Assimilating EUMETSAT-9 Atmospheric Motion Vectors
- Using uniform thinning mesh for brightness temperature data
- Improving assimilation of GPS radio occultation data (forward operator, QC procedures, observation error tuning)
- Adding dry mass pressure constraint
- Using GODDARD Modeling and Assimilation Office/EMC merged code including hooks for 4DVAR and Observation Sensitivity
- Updating background error covariance file
