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Spectral Cloud-Filtering of AIRS Data: Non-Polar OceanThe Atmospheric Infrared Sounder (AIRS) is a grating array spectrometer which covers the thermal infrared spectral range between 640 and 1700/cm. In order to retain the maximum radiometric accuracy of the AIRS data, the effects of cloud contamination have to be minimized. We discuss cloud filtering which uses the high spectral resolution of AIRS to identify about 100,000 of 500,000 non-polar ocean spectra per day as relatively "cloud-free". Based on the comparison of surface channels with the NCEP provided global real time sst (rtg.sst), AIRS surface sensitive channels have a cold bias ranging from O.5K during the day to 0.8K during the night. Day and night spatial coherence tests show that the cold bias is due to cloud contamination. During the day the cloud contamination is due to a 2-3% broken cloud cover at the 1-2 km altitude, characteristic of low stratus clouds. The cloud-contamination effects surface sensitive channels only. Cloud contamination can be reduced to 0.2K by combining the spectral filter with a spatial coherence threshold, but the yield drops to 16,000 spectra per day. AIRS was launched in May 2002 on the Earth Observing System (EOS) Aqua satellite. Since September 2002 it has returned 4 million spectra of the globe each day.
Document ID
20110015997
Acquisition Source
Jet Propulsion Laboratory
Document Type
Conference Paper
External Source(s)
Authors
Aumann, Hartmut H.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Gregorich, David
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Barron, Diana
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 25, 2013
Publication Date
August 2, 2004
Subject Category
Meteorology And Climatology
Meeting Information
Meeting: SPIE 49th Annual Meeting
Location: Denver, CO
Country: United States
Start Date: August 2, 2004
End Date: August 6, 2004
Sponsors: International Society for Optical Engineering
Distribution Limits
Public
Copyright
Other
Keywords
infrared
cloud filter
temperature retrieval
remote sensing
carbon dioxide
ozone

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