AIRS polarization and radiometric calibration update using data from the Aqua deep space maneuver

Thomas S. Pagano; Steven E. Broberg; Evan M. Manning; Hartmut H. Aumann

doi:10.1117/12.2633486

30 September 2022 AIRS polarization and radiometric calibration update using data from the Aqua deep space maneuver

Thomas S. Pagano, Steven E. Broberg, Evan M. Manning, Hartmut H. Aumann

Proceedings Volume 12232, Earth Observing Systems XXVII; 122320B (2022) https://doi.org/10.1117/12.2633486
Event: SPIE Optical Engineering + Applications, 2022, San Diego, California, United States

Abstract

The Atmospheric Infrared Sounder (AIRS) on the EOS Aqua Spacecraft acquires hyperspectral infrared radiances in 2378 channels ranging in wavelength from 3.7-15.4 um with spectral resolution of better than 1200, and spatial resolution of 13.5 km with global daily coverage. The AIRS was designed to measure temperature and water vapor profiles for improvement in weather forecast and improved parameterization of climate processes. Coupling of the polarization emitted from the AIRS scan mirror and the polarization of the spectrometer introduces a scan dependent modulation of the instrument radiometric response. Measurements of the polarization pre-flight were used to determine the current calibration coefficients in Version 5. A Deep Space Maneuver (DSM) of the Aqua Spacecraft, which was performed on September 23, 2021, provides a unique measurement of the radiometric modulation that we can use to derive a new set of polarization parameters for the system. The test involves pitching the Aqua spacecraft in the form of a ‘back flip’ that enables the AIRS instrument (and other instruments on the spacecraft) to view cold space in the Earth view for all scan angles for a good portion of the maneuver. The observed modulation of the data while viewing space is a direct measurement of the mirror polarized emission. The polarization coefficients derived from the maneuver are expected to improve left/right asymmetries and reduce radiometric errors in cold scenes. This paper summarizes the methodologies used, and compares the new polarization parameters to those derived pre-flight and in-orbit using space views.

Conference Presentation

Citation Download Citation

Thomas S. Pagano, Steven E. Broberg, Evan M. Manning, and Hartmut H. Aumann "AIRS polarization and radiometric calibration update using data from the Aqua deep space maneuver", Proc. SPIE 12232, Earth Observing Systems XXVII, 122320B (30 September 2022); https://doi.org/10.1117/12.2633486

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