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Sensitivity analysis for Atmospheric Infrared Sounder (AIRS) CO₂ retrieval

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dc.contributor.author Li, Zhijin
dc.date.accessioned 2013-06-21T16:04:57Z
dc.date.available 2013-06-21T16:04:57Z
dc.date.issued 2012-09-27
dc.identifier.citation Summer Undergrad Research Fellowship, Pasadena, California, September 27, 2012. en_US
dc.identifier.clearanceno 12-4965
dc.identifier.uri http://hdl.handle.net/2014/43292
dc.description.abstract The Atmospheric Infrared Sounder (AIRS) is a thermal infrared sensor able to retrieve the daily atmospheric state globally for clear as well as partially cloudy field-of-views. The AIRS spectrometer has 2378 channels sensing from 15.4 μm to 3.7 μm, of which a small subset in the 15 μm region has been selected, to date, for CO2 retrieval. To improve upon the current retrieval method, we extended the retrieval calculations to include a prior estimate component and developed a channel ranking system to optimize the channels and number of channels used. The channel ranking system uses a mathematical formalism to rapidly process and assess the retrieval potential of large numbers of channels. Implementing this system, we identifed a larger optimized subset of AIRS channels that can decrease retrieval errors and minimize the overall sensitivity to other iridescent contributors, such as water vapor, ozone, and atmospheric temperature. This methodology selects channels globally by accounting for the latitudinal, longitudinal, and seasonal dependencies of the subset. The new methodology increases accuracy in AIRS CO2 as well as other retrievals and enables the extension of retrieved CO2 vertical profiles to altitudes ranging from the lower troposphere to upper stratosphere. The extended retrieval method for CO2 vertical profile estimation using a maximum-likelihood estimation method. We use model data to demonstrate the benenifcial impact of the extended retrieval method using the new channel ranking system on CO2 retrieval. 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, 2012. en_US
dc.subject Atmospheric Infrared Sounder (AIRS) en_US
dc.subject carbon dioxide en_US
dc.subject sensitivity analysis en_US
dc.subject channel selection en_US
dc.title Sensitivity analysis for Atmospheric Infrared Sounder (AIRS) CO₂ retrieval en_US
dc.type Student Report en_US
dc.subject.NASATaxonomy Earth Resources and Remote Sensing en_US


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