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- W3099683732 abstract "<p align="justify"><span>The TROPOspheric Monitoring Instrument (TROPOMI) aboard of the Sentinel 5 Precursor (S5P) has provided methane measurements for more than two years. The high accuracy together with the exceptional spatial resolution (7 x 7 km</span><sup><span>2</span></sup><span>, 7 x 5.2 km</span><sup><span>2 </span></sup><span>since August 2019) and temporal coverage (daily) of TROPOMI provides a unique perspective on local to regional methane enhancements. In this contribution, we discuss observations of enhanced methane concentrations over the United States. We analyse in detail temporal and spatial variability of methane over wetlands and agricultural areas along the Mississippi river and in Florida. To understand the observed CH4 anomalies regarding both natural and anthropogenic sources and transport at regional scales, we support our analysis with simulations from the GEOS-Chem atmospheric chemistry and transport model. We also investigate the possibility to use other datasets as a proxy for CH4 emissions (e.g. NO2 for agricultural areas, land surface temperature for wetlands). These results are based on an improved TROPOMI methane product that features among others a new bias correction that is fully independent of any reference measurements. The verification of the TROPOMI XCH4 data with ground-based measurements by the TCCON network yields a station-to-station variability of the XCH</span><sub><span>4</span></sub><span> error below 10 ppb, in agreement with the comparison with the proxy methane product from the Japanese GOSAT and GOSAT-2 missions. The improved TROPOMI methane product is planned as a future update of the operational TROPOMI processor.</span></p><p align="justify">&#160;</p><p>&#160;</p>" @default.
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- W3099683732 date "2020-03-23" @default.
- W3099683732 modified "2023-09-27" @default.
- W3099683732 title "Detection of methane enhancements over the Eastern United States with improved TROPOMI retrievals" @default.
- W3099683732 doi "https://doi.org/10.5194/egusphere-egu2020-16074" @default.
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