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An Investigation of the Characterization of Cloud Contamination in Hyperspectral RadiancesIn regions lacking direct observations, the assimilation of radiances from infrared and microwave sounders is the primary method for characterizing the atmosphere in the analysis process. In recent years, technological advances have led to the launching of more advanced sounders, particularly in the thermal infrared spectrum. With the advent of these hyperspectral sounders, the amount of data available for the analysis process has and will continue to be dramatically increased. However, the utilization of infrared radiances in variational assimilation can be problematic in the presence of clouds; specifically the assessment of the presence of clouds in an instantaneous field of view (IFOV) and the contamination in the individual channels within the IFOV. Various techniques have been developed to determine if a channel is contaminated by clouds. The work presented in this paper and subsequent presentation will investigate traditional techniques and compare them to a new technique, the C02 sorting technique, which utilizes the high spectral resolution of the Atmospheric Infrared Sounder (AIRS) within the framework of the Gridpoint Statistical Interpolation (GSI) 3DVAR system. Ultimately, this work is done in preparation for the assessment of short-term forecast impacts with the regional assimilation of AIRS radiances within the analysis fields of the Weather Research and Forecast Nonhydrostatic Mesoscale Model (WRF-NMM) at the NASA Short-term Prediction Research and Transition (SPORT) Center.
Document ID
20070013862
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
McCarty, William
(Alabama Univ. Huntsville, AL, United States)
Jedlovec, Gary J.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
LeMarshall, John
(National Oceanic and Atmospheric Administration Camp Springs, MD, United States)
Date Acquired
August 23, 2013
Publication Date
January 18, 2007
Subject Category
Meteorology And Climatology
Meeting Information
Meeting: 87th Annual Meeting of the American Meteorologist Society
Location: San Antonio, TX
Country: United States
Start Date: January 14, 2007
End Date: January 18, 2007
Distribution Limits
Public
Copyright
Other

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