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Methane retrieved from TROPOMI: Improvement of the data product and validation of the first 2 years of measurements

Lorente, A.; Borsdorff, T.; Butz, A.; Hasekamp, O.; Aan De Brugh, J.; Schneider, A.; Wu, L.; Hase, F.; Kivi, R.; Wunch, D.; Pollard, D. F.; Shiomi, K.; Deutscher, N. M.; Velazco, V. A.; Roehl, C. M.; Wennberg, P. O.; Warneke, T.; Landgraf, J.

Abstract:
The TROPOspheric Monitoring Instrument (TROPOMI) on board the Sentinel 5 Precursor (S5-P) satellite provides methane (CH4) measurements with high accuracy and exceptional temporal and spatial resolution and sampling. TROPOMI CH$_{4}$ measurements are highly valuable to constrain emissions inventories and for trend analysis, with strict requirements on the data quality. This study describes the improvements that we have implemented to retrieve CH$_{4}$ from TROPOMI using the RemoTeC full-physics algorithm. The updated retrieval algorithm features a constant regularization scheme of the inversion that stabilizes the retrieval and yields less scatter in the data and includes a higher resolution surface altitude database. We have tested the impact of three state-of-the-art molecular spectroscopic databases (HITRAN 2008, HITRAN 2016 and Scientific Exploitation of Operational Missions – Improved Atmospheric Spectroscopy Databases SEOM-IAS) and found that SEOM-IAS provides the best fitting results. The most relevant update in the TROPOMI XCH$_{4}$ data product is the implementation of an a posteriori correction fully independent of any reference data that is more accurate and corrects for the underestimation at low surface albedo scenes and the overestimation at high surface albedo scenes. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000130274
Veröffentlicht am 05.03.2021
Originalveröffentlichung
DOI: 10.5194/amt-14-665-2021
Scopus
Zitationen: 1
Web of Science
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung (IMK)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 1867-1381, 1867-8548
KITopen-ID: 1000130274
Erschienen in Atmospheric Measurement Techniques
Verlag Copernicus Publications
Band 14
Heft 1
Seiten 665-684
Nachgewiesen in Scopus
Web of Science
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