Coupled Assimilation of Geostationary Satellite Sounder Data into a Mesoscale Model Using the Bratseth Analysis Approach

Frank H. Ruggiero Battlespace Environment Division, Air Force Research Laboratory, Hanscom AFB, Massachusetts

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Keith D. Sashegyi Remote Sensing Division, Naval Research Laboratory, Washington, D.C.

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Alan E. Lipton Battlespace Environment Division, Air Force Research Laboratory, Hanscom AFB, Massachusetts

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Rangarao V. Madala Remote Sensing Division, Naval Research Laboratory, Washington, D.C.

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Sethu Raman Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University, Raleigh, North Carolina

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Abstract

A satellite–model coupled procedure for assimilating geostationary satellite sounder data was adapted to a mesoscale analysis and forecast system jointly developed by the Naval Research Laboratory and the Air Force Research Laboratory. The coupled procedure involves the use of the model output fields as the first guess for the thermodynamic retrievals. Atmospheric thermodynamic profiles and ground temperatures were retrieved from observed radiances of the VISSR Atmospheric Sounder (VAS) on board the Geostationary Operational Environmental Satellite. The successive corrections objective analysis scheme in the mesoscale analysis and forecast system was modified to consider the horizontal spatial correlation of the satellite data. The procedure was tested using a wintertime case from the 1986 Genesis of Atlantic Lows Experiment project. The retrievals generated by the coupled method were modestly improved relative to independent stand-alone retrievals. Coupled analyses and forecasts of temperature and moisture fields compared favorably to forecasts from a control run without the VAS assimilation.

* Current affiliation: Atmospheric and Environmental Research Inc., Cambridge, Massachusetts.

Corresponding author address: Dr. Frank H. Ruggiero, AFRL/VSBE, 29 Randolph Road, Hanscom AFB, MA 01731-3010.

Email: ruggiero@arcdbs.plh.af.mil

Abstract

A satellite–model coupled procedure for assimilating geostationary satellite sounder data was adapted to a mesoscale analysis and forecast system jointly developed by the Naval Research Laboratory and the Air Force Research Laboratory. The coupled procedure involves the use of the model output fields as the first guess for the thermodynamic retrievals. Atmospheric thermodynamic profiles and ground temperatures were retrieved from observed radiances of the VISSR Atmospheric Sounder (VAS) on board the Geostationary Operational Environmental Satellite. The successive corrections objective analysis scheme in the mesoscale analysis and forecast system was modified to consider the horizontal spatial correlation of the satellite data. The procedure was tested using a wintertime case from the 1986 Genesis of Atlantic Lows Experiment project. The retrievals generated by the coupled method were modestly improved relative to independent stand-alone retrievals. Coupled analyses and forecasts of temperature and moisture fields compared favorably to forecasts from a control run without the VAS assimilation.

* Current affiliation: Atmospheric and Environmental Research Inc., Cambridge, Massachusetts.

Corresponding author address: Dr. Frank H. Ruggiero, AFRL/VSBE, 29 Randolph Road, Hanscom AFB, MA 01731-3010.

Email: ruggiero@arcdbs.plh.af.mil

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