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Accuracy of Geophysical Parameters Derived from AIRS/AMSU as a Function of Fractional Cloud CoverAIRS was launched on EOS Aqua on May 4,2002, together with AMSU A and HSB, to form a next generation polar orbiting infrared and microwave atmospheric sounding system. The primary products of AIRS/AMSU are twice daily global fields of atmospheric temperature-humidity profiles, ozone profiles, sea/land surface skin temperature, and cloud related parameters including OLR. The sounding goals of AIRS are to produce 1 km tropospheric layer mean temperatures with an rms error of lK, and layer precipitable water with an rms error of 20 percent, in cases with up to 80 percent effective cloud cover. The basic theory used to analyze Atmospheric InfraRed Sounder/Advanced Microwave Sounding Unit/Humidity Sounder Brazil (AIRS/AMSU/HSB) data in the presence of clouds, called the at-launch algorithm, was described previously. Pre-launch simulation studies using this algorithm indicated that these results should be achievable. Some modifications have been made to the at-launch retrieval algorithm as described in this paper. Sample fields of parameters retrieved from AIRS/AMSU/HSB data are presented and validated as a function of retrieved fractional cloud cover. As in simulation, the degradation of retrieval accuracy with increasing cloud cover is small and the RMS accuracy of lower tropospheric temperature retrieved with 80 percent cloud cover is about 0.5 K poorer than for clear cases. HSB failed in February 2003, and consequently HSB channel radiances are not used in the results shown in this paper. The AIRS/AMSU retrieval algorithm described in this paper, called Version 4, become operational at the Goddard DAAC (Distributed Active Archive Center) in April 2003 and is being used to analyze near-real time AIRS/AMSU data. Historical AIRS/AMSU data, going backwards from March 2005 through September 2002, is also being analyzed by the DAAC using the Version 4 algorithm.
Document ID
Document Type
Preprint (Draft being sent to journal)
Susskind, Joel (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Barnet, Chris (National Oceanic and Atmospheric Administration Camp Springs, MD, United States)
Blaisdell, John (Science Applications International Corp. Greenbelt, MD, United States)
Iredell, Lena (Science Applications International Corp. Greenbelt, MD, United States)
Keita, Fricky (Science Applications International Corp. Greenbelt, MD, United States)
Kouvaris, Lou (Science Applications International Corp. Greenbelt, MD, United States)
Molnar, Gyula (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Chahine, Moustafa (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 23, 2013
Publication Date
January 1, 2006
Subject Category
Earth Resources and Remote Sensing
Distribution Limits
Public Use Permitted.

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