15 October 2012 Level-1C product from AIRS: principal component filtering
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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. In a grating spectrometer each individual radiance measurement is largely independent of all others. Most measurements are extremely accurate and have very low noise levels. However, some channels exhibit high noise levels or other anomalous behavior, complicating applications needing radiances throughout a band, such as cross-calibration with other instruments and regression retrieval algorithms. The AIRS Level-1C product is similar to Level-1B but with instrument artifacts removed. This paper focuses on the “cleaning” portion of Level-1C, which identifies bad radiance values within spectra and produces substitute radiances using redundant information from other channels. The substitution is done in two passes, first with a simple combination of values from neighboring channels, then with principal components. After results of the substitution are shown, differences between principal component reconstructed values and observed radiances are used to investigate detailed noise characteristics and spatial misalignment in other channels.
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Evan M. Manning, Evan M. Manning, Yibo Jiang, Yibo Jiang, Hartmut H. Aumann, Hartmut H. Aumann, Denis A Elliott, Denis A Elliott, Scott Hannon, Scott Hannon, } "Level-1C product from AIRS: principal component filtering", Proc. SPIE 8510, Earth Observing Systems XVII, 85100V (15 October 2012); doi: 10.1117/12.928546; https://doi.org/10.1117/12.928546
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