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All-sky radiance assimilation using individual hydrometeors as cloud control variables for FV3GFS with GFDL microphysics scheme

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Tuesday, 28 May 2019, 10:30

Tuesday, May 28, 2019. 10:30AM. All-sky radiance assimilation using individual hydrometeors as cloud control variables for FV3GFS with GFDL microphysics scheme. Minjin Lee, Cooperative Institute for Climate Science. Sponsored by NOAA GFDL. More information here.

 

The all-sky radiance assimilation framework of FV3GFS has been upgraded to use five individual hydrometeors as cloud control variables. This development effort was motivated by the model microphysics upgrade to the GFDL microphysics scheme. With this model upgrade, cloud liquid water, cloud ice, rain, snow and graupel become model prognostic variables. Adding precipitation hydrometeors allows the assimilation of precipitation-affected radiance in addition to cloudy radiance in the all-sky framework. The Community Radiative Transfer Model (CRTM) was carefully configured for the assimilation of precipitation-affected radiance. More stringent quality control was used to handle larger first guess departures when precipitation hydrometeors were included. Radiance observations from the Advanced Microwave Sounding Unit-A (AMSU-A) and the Advanced Technology Microwave Sounder (ATMS) over water were assimilated in all-sky approach. This new constructed all-sky framework works reasonably well. Improvement was found in 500 hPa geopotential height forecast and temperature forecast in the lower troposphere.

Location  NOAA GFDL, Smagorinsky Seminar Room, Princeton University, Princeton, NJ.