Validation of JEDI Software for NCEP's Next Generation Unified Forecast System

The Joint Effort for Data-assimilation Integration (JEDI) project, developed by the Joint Center for Satellite Data Assimilation (JCSDA), is intended as the next-generation DA software for use throughout NOAA and other organizations. In addition to replacing much of the existing code infrastructure, JEDI software aims to account for additional components of the Earth system and allow for faster development and research-to-operations of advanced DA to meet the requirements of NOAA’s Unified Forecast System (UFS).

For JEDI software to be accepted by the National Centers for Environmental Prediction (NCEP) for use in a future version of the Global Forecast System (GFS), the system components must be verified independently for scientific validity and computational stability. Some of the components to verify include observation error and background error covariance matrices.

In the presentation, we will validate JEDI software for atmospheric assimilation by comparing static background error and observation error impacts on the assimilation using a three-dimensional, deterministic data assimilation (3DVar) procedure; this will be done using atmospheric GFS forecasts at the operational resolution. Results from single observation impact tests of air temperature and wind speed will be shown.