The Impact of AMSU-A Radiance Assimilation in the U.S. Navy's Operational Global Atmospheric Prediction System (NOGAPS)
NAVAL RESEARCH LAB MONTEREY CA MARINE METEOROLOGY DIV
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The Navy Operational Global Atmospheric Prediction System NOGAPS is the U.S. Department of Defenses high-resolution global weather prediction system, which is used for operational mesoscale and oceanographic models and numerical weather prediction NWP research. The analysis for NOGAPS is produced by the NRL Atmospheric Variational Data Assimilation System NAVDAS. On June 9, 2004, NAVDAS began operational assimilation of ASMU-A radiances from the Advanced TIROS Operational Vertical Sounder ATOVS sensor suite onboard NOAA 15 and 16 for NOGAPS. The direct assimilation of AMSU-A radiances replaced the assimilation of ATOVS temperature retrievals produced by NOAAs National Environmental Satellite, Data and Information Service NESDIS. The results of medium-range forecast tests of radiance assimilation versus NESDIS ATOVS retrieval assimilation show substantial improvement in the forecasts of height, wind, and temperature in both the Northern and Southern Hemispheres. In the tropics, the tropical cyclone track errors are smaller with radiance assimilation, even though the upper- and lower-level errors are essentially the same. Overall, there are fewer forecast busts with radiance assimilation, especially in the Southern Hemisphere.
- Unmanned Spacecraft