Methane retrieved from TROPOMI: improvement of the data product and validation of the first 2 years of measurements
The TROPOspheric Monitoring Instrument (TROPOMI) on board the Sentinel 5 Precursor (S5-P) satellite provides methane measurements with high accuracy and exceptional temporal and spatial resolution and sampling. TROPOMI CH<span class="inline-formula"><sub>4</sub></span&...
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| Main Authors: | , , , , , , , , , , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
28 January 2021
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| In: |
Atmospheric measurement techniques
Year: 2021, Volume: 14, Issue: 1, Pages: 665-684 |
| ISSN: | 1867-8548 |
| DOI: | 10.5194/amt-14-665-2021 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.5194/amt-14-665-2021 Verlag, lizenzpflichtig, Volltext: https://amt.copernicus.org/articles/14/665/2021/ 
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| Author Notes: | Alba Lorente, Tobias Borsdorff, Andre Butz, Otto Hasekamp, Joost aan de Brugh, Andreas Schneider, Lianghai Wu, Frank Hase, Rigel Kivi, Debra Wunch, David F. Pollard, Kei Shiomi, Nicholas M. Deutscher, Voltaire A. Velazco, Coleen M. Roehl, Paul O. Wennberg, Thorsten Warneke, and Jochen Landgraf |
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| 245 | 1 | 0 | |a Methane retrieved from TROPOMI |b improvement of the data product and validation of the first 2 years of measurements |c Alba Lorente, Tobias Borsdorff, Andre Butz, Otto Hasekamp, Joost aan de Brugh, Andreas Schneider, Lianghai Wu, Frank Hase, Rigel Kivi, Debra Wunch, David F. Pollard, Kei Shiomi, Nicholas M. Deutscher, Voltaire A. Velazco, Coleen M. Roehl, Paul O. Wennberg, Thorsten Warneke, and Jochen Landgraf |
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| 520 | |a The TROPOspheric Monitoring Instrument (TROPOMI) on board the Sentinel 5 Precursor (S5-P) satellite provides methane measurements with high accuracy and exceptional temporal and spatial resolution and sampling. TROPOMI CH<span class="inline-formula"><sub>4</sub></span> 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<span class="inline-formula 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<span class="inline-formula"><sub>4</sub></span> 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. After applying the correction, the albedo dependence is removed to a large extent in the TROPOMI versus satellite (Greenhouse gases Observing SATellite - GOSAT) and TROPOMI versus ground-based observations (Total Carbon Column Observing Network - TCCON) comparison, which is an independent verification of the correction scheme. We validate 2 years of TROPOMI CH<span class="inline-formula"><sub>4</sub></span> data that show the good agreement of the updated TROPOMI CH<span class="inline-formula"><sub>4</sub></span> with TCCON (<span class="inline-formula">−</span>3.4 <span class="inline-formula">±</span> 5.6 ppb) and GOSAT (<span class="inline-formula">−</span>10.3 <span class="inline-formula">±</span> 16.8 ppb) (mean bias and standard deviation). Low- and high-albedo scenes as well as snow-covered scenes are the most challenging for the CH<span class="inline-formula"><sub>4</sub></span> retrieval algorithm, and although the a posteriori correction accounts for most of the bias, there is a need to further investigate the underlying cause.</p> | ||
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