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Using AIRS and IASI Data to Evaluate Absolute Radiometric Accuracy and Stability for Climate ApplicationsThe creation of multi-decadal data sets for climate research requires better than 100 mK absolute calibration accuracy for the full range of spectral temperatures encountered under global conditions. Validation that this accuracy is achieved by the operational hyperspectral sounders from polar orbit is facilitated by comparing data from two instruments. Extreme radiometric calibration stability is critical to allow a long time series of noisy, but presumably long-term accurate truth measurements to be used for the validation of absolute accuracy at the 100 mK level. We use the RTGSST in the tropical oceans as ground truth. The difference between the AIRS derived sst2616 and the RTGSST based on six years of data shows a systematic cold bias of about 250 mK, but better than 4 mK/year stability. The double difference between AIRS and the RTGSST and IASI and the RTGSST with less than one year of data already allows statements at the 100 mK absolute level. It shows a 60 mK difference between the AIRS and the IASI calibration at 2616 cm-(sup 1) and 300 K, with a statistically insignificant 20 mK shift in six months.
Document ID
20150008631
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)
Pagano, Thomas S.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
May 20, 2015
Publication Date
August 12, 2008
Subject Category
Meteorology And Climatology
Meeting Information
Meeting: SPIE Instruments, Methods, and Missions for Astrobiology XI
Location: San Diego, CA
Country: United States
Start Date: August 12, 2008
End Date: August 14, 2008
Sponsors: International Society for Optical Engineering
Distribution Limits
Public
Copyright
Other
Keywords
EOS Aqua
polar orbiter
infrared
Hyperspectral
calibration
Metop-A

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