A250-02
Impact of Hyperspectral Infrared Radiance Assimilation in Cloudy Regions: A Study of the 2017 Atlantic Tropical Cyclone Season with the NASA GEOS

Thursday, 17 December 2020: 04:05
Virtual
Erica L McGrath-Spangler1, Oreste Reale2, Manisha Ganeshan2, Niama Boukachaba3, Christopher D Barnet4, Will McCarty5 and Ron Gelaro5, (1)Universities Space Research Association Greenbelt, GESTAR, Greenbelt, MD, United States, (2)Universities Space Research Association Greenbelt, Greenbelt, MD, United States, (3)Universities Space Research Association, Greenbelt, MD, United States, (4)Science and Technology Corporation (STC), Columbia, MD, United States, (5)NASA/GMAO, Greenbelt, MD, United States
Recorded Presentation
Abstract:
The development of assimilation techniques for infrared radiances in regions affected by clouds is lagging behind, compared to microwave sensors, which are now routinely assimilated under all-sky conditions. This study examines the benefits achieved when assimilating cloud-cleared radiances (CCRs), using the NASA’s Goddard Earth Observing System (GEOS) hybrid 4DEnVar system. The focus is on the 2017 Atlantic hurricane season. Three infamous hurricanes (Harvey, Irma, and Maria) are investigated in depth, showing the impact on the analyzed representation of horizontal and vertical structure and on forecast skill. In addition, the effect of IR data density on the forecasts is discussed.
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