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Synergetic use of IASI profile and TROPOMI total-column level 2 methane retrieval products

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<p><strong class="journal-contentHeaderColor">Abstract.</strong> The thermal infrared nadir spectra of IASI (Infrared Atmospheric Sounding Interferometer) are successfully used for retrievals of different atmospheric trace gas profiles. However, these retrievals offer gen...

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Main Authors: Schneider, Matthias (Author) , Ertl, Benjamin (Author) , Tu, Qiansi (Author) , Diekmann, Christopher J. (Author) , Khosrawi, Farahnaz (Author) , Röhling, Amelie N. (Author) , Hase, Frank (Author) , Dubravica, Darko (Author) , García, Omaira E. (Author) , Sepúlveda, Eliezer (Author) , Borsdorff, Tobias (Author) , Landgraf, Jochen (Author) , Lorente, Alba (Author) , Butz, André (Author) , Chen, Huilin (Author) , Kivi, Rigel (Author) , Laemmel, Thomas (Author) , Ramonet, Michel (Author) , Crevoisier, Cyril (Author) , Pernin, Jérome (Author) , Steinbacher, Martin (Author) , Meinhardt, Frank (Author) , Strong, Kimberly (Author) , Wunch, Debra (Author) , Warneke, Thorsten (Author) , Roehl, Coleen (Author) , Wennberg, Paul O. (Author) , Morino, Isamu (Author) , Iraci, Laura (Author) , Shiomi, Kei (Author) , Deutscher, Nicholas M. (Author) , Griffith, David W. T. (Author) , Velazco, Voltaire (Author) , Pollard, David F. (Author)
Format: Article (Journal)
Language:English
Published: 29 July 2022
In: Atmospheric measurement techniques
Year: 2022, Volume: 15, Issue: 14, Pages: 4339-4371
ISSN:1867-8548
DOI:10.5194/amt-15-4339-2022
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.5194/amt-15-4339-2022
Verlag, lizenzpflichtig, Volltext: https://amt.copernicus.org/articles/15/4339/2022/
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Author Notes:Matthias Schneider, Benjamin Ertl, Qiansi Tu, Christopher J. Diekmann, Farahnaz Khosrawi, Amelie N. Röhling, Frank Hase, Darko Dubravica, Omaira E. García, Eliezer Sepúlveda, Tobias Borsdorff, Jochen Landgraf, Alba Lorente, André Butz, Huilin Chen, Rigel Kivi, Thomas Laemmel, Michel Ramonet, Cyril Crevoisier, Jérome Pernin, Martin Steinbacher, Frank Meinhardt, Kimberly Strong, Debra Wunch, Thorsten Warneke, Coleen Roehl, Paul O. Wennberg, Isamu Morino, Laura T. Iraci, Kei Shiomi, Nicholas M. Deutscher, David W.T. Griffith, Voltaire A. Velazco, and David F. Pollard
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Summary:<p><strong class="journal-contentHeaderColor">Abstract.</strong> The thermal infrared nadir spectra of IASI (Infrared Atmospheric Sounding Interferometer) are successfully used for retrievals of different atmospheric trace gas profiles. However, these retrievals offer generally reduced information about the lowermost tropospheric layer due to the lack of thermal contrast close to the surface. Spectra of scattered solar radiation observed in the near-infrared and/or shortwave infrared, for instance by TROPOMI (TROPOspheric Monitoring Instrument), offer higher sensitivity near the ground and are used for the retrieval of total-column-averaged mixing ratios of a variety of atmospheric trace gases. Here we present a method for the synergetic use of IASI profile and TROPOMI total-column level 2 retrieval products. Our method uses the output of the individual retrievals and consists of linear algebra a posteriori calculations (i.e. calculation after the individual retrievals). We show that this approach has strong theoretical similarities to applying the spectra of the different sensors together in a single retrieval procedure but with the substantial advantage of being applicable to data generated with different individual retrieval processors, of being very time efficient, and of directly benefiting from the high quality and most recent improvements of the individual retrieval processors.</p> <p>We demonstrate the method exemplarily for atmospheric methane (CH<span class="inline-formula"><sub>4</sub></span>). We perform a theoretical evaluation and show that the a posteriori combination method yields a total-column-averaged CH<span class="inline-formula"><sub>4</sub></span> product (XCH<span class="inline-formula"><sub>4</sub></span>) that conserves the good sensitivity of the corresponding TROPOMI product while merging it with the high-quality upper troposphere-lower stratosphere (UTLS) CH<span class="inline-formula"><sub>4</sub></span> partial-column information of the corresponding IASI product. As a consequence, the combined product offers additional sensitivity for the tropospheric CH<span class="inline-formula"><sub>4</sub></span> partial column, which is not provided by the individual TROPOMI nor the individual IASI product. The theoretically predicted synergetic effect is verified by comparisons to CH<span class="inline-formula"><sub>4</sub></span> reference data obtained from collocated XCH<span class="inline-formula"><sub>4</sub></span> measurements at 14 globally distributed TCCON (Total Carbon Column Observing Network) stations, CH<span class="inline-formula"><sub>4</sub></span> profile measurements made by 36 individual AirCore soundings, and tropospheric CH<span class="inline-formula"><sub>4</sub></span> data derived from continuous ground-based in situ observations made at two nearby Global Atmospheric Watch (GAW) mountain stations. The comparisons clearly demonstrate that the combined product can reliably detect the actual variations of atmospheric XCH<span class="inline-formula"><sub>4</sub></span>, CH<span class="inline-formula"><sub>4</sub></span> in the UTLS, and CH<span class="inline-formula"><sub>4</sub></span> in the troposphere. A similar good reliability for the latter is not achievable by the individual TROPOMI and IASI products.</p>
Item Description:Gesehen am 06.09.2022
Physical Description:Online Resource
ISSN:1867-8548
DOI:10.5194/amt-15-4339-2022

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