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Recent checks on the radiometric and spatial calibration of AIRS in-orbit

Show simple item record Pagano, Thomas S. Broberg, Steven E. 2019-06-11T21:58:31Z 2019-06-11T21:58:31Z 2016-04-28
dc.identifier.citation SPIE Optics and Photonics, San Diego, California, August 28 - September 1, 2016 en_US
dc.identifier.clearanceno 16-4265
dc.description.abstract The Atmospheric Infrared Sounder (AIRS) on the EOS Aqua Spacecraft was launched on May 4, 2002 and is currently fully operational. AIRS 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. Currently the AIRS Level 1B Radiance Products are assimilated by NWP centers worldwide and have shown considerable forecast improvement. Although the calibration of AIRS (< 200 mK 3 sigma) is sufficient for data assimilation into Numerical Weather Prediction (NWP) models, long term trends of Earth’s climate require radiances with stability approaching 10 mK/year, and absolute accuracies better than 100 mK. This investigation uses views of space during roll maneuvers of the Aqua spacecraft to calibrate the mirror emission (one of the largest error sources for AIRS) and reduce the residual errors in cold scenes. We also present results of a secondary study that uses MODIS data to determine the alignment of the AIRS boresight. In this study we match AIRS and MODIS data and iterate on the assumed boresight to find the minimum difference in signal. In this way we are able to confirm the boresight projections determined shortly after launch. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher Pasadena, CA: Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2016 en_US
dc.subject Atmosphere en_US
dc.subject Infrared en_US
dc.subject Sounder en_US
dc.subject AIRS en_US
dc.subject Calibration en_US
dc.title Recent checks on the radiometric and spatial calibration of AIRS in-orbit en_US
dc.type Preprint en_US

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