Evaluation of Dual Geostationary Stereo Winds in NAVGEM
The National Environmental Satellite, Data, and Information Service (NESDIS) and the National Aeronautics and Space Administration (NASA) developed and produced dual geostationary winds using the stereo method to jointly retrieve wind vectors with their geometric heights from geostationary satellite pairs1, GOES16 and GOES17 in their overlap region, and GOES17 and Himawari-8 in their overlap region. The winds were tested in NAVGEM, the U.S. Navy’s global numerical weather prediction system. Part of the motivation for our work was to mitigate errors due GOES-17 saturation of key channels, when operational AMVs become fewer in number and use less optimal height assignment methods, so we compare NAVGEM innovation statistics for the stereo winds to the statistics for winds using multi-channel height assignment method during time periods affected by channel saturation as well as unaffected time periods. We present two types of evaluation of these winds: comparisons of collocated stereo winds with AMVs produced using operational height assignments; and comparison of results of the superobbed stereo winds in an assimilative NAVGEM test run with a control run assimilating superobbed AMVs with operational height assignments.
1 Carr JL, Wu DL, Daniels J, Friberg MD, Bresky W, Madani H. GEO–GEO Stereo‐Tracking of Atmospheric Motion Vectors (AMVs) from the Geostationary Ring. Remote Sensing. 2020; 12(22):3779. https://doi.org/10.3390/rs12223779
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