20 August 2008 Level 1C spectra from the Atmospheric Infrared Sounder (AIRS)
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Abstract
The Atmospheric Infrared Sounder (AIRS), launched on the EOS Aqua spacecraft on May 4, 2002, is a grating spectrometer with 2378 channels in the range 3.7 to 15.4 microns. Spectra from grating spectrometers are capable of unsurpassed absolute radiometric accuracy, which makes them excellent potential sources for climate data records used in climate trending analyses. However, because each channel has its own detector and (partially) its own electronics, some individual channels can suffer from higher noise than other channels and, in extreme cases, can fail completely. Radiometric quality non-uniformity can complicate error and noise estimation for some products. In particular, crosscalibration with other instruments, frequency interpolation, and frequency shifting are made more difficult. AIRS level 1B data are calibrated spectral radiances from each channel. This paper describes results of creating level 1C spectra from level 1B data, where radiances from channels determined to be very noisy are replaced with values determined by taking advantage of channel-to-channel correlations. Several methods are evaluated and validated.
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Denis A. Elliott, Denis A. Elliott, Hartmut H. Aumann, Hartmut H. Aumann, Yibo Jiang, Yibo Jiang, Steven E. Broberg, Steven E. Broberg, } "Level 1C spectra from the Atmospheric Infrared Sounder (AIRS)", Proc. SPIE 7081, Earth Observing Systems XIII, 70810L (20 August 2008); doi: 10.1117/12.795491; https://doi.org/10.1117/12.795491
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