Articles | Volume 17, issue 4
https://doi.org/10.5194/amt-17-1297-2024
https://doi.org/10.5194/amt-17-1297-2024
Research article
 | 
23 Feb 2024
Research article |  | 23 Feb 2024

Ship- and aircraft-based XCH4 over oceans as a new tool for satellite validation

Astrid Müller, Hiroshi Tanimoto, Takafumi Sugita, Prabir K. Patra, Shin-ichiro Nakaoka, Toshinobu Machida, Isamu Morino, André Butz, and Kei Shiomi

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Short summary
Satellite CH4 observations with high accuracy are needed to understand changes in atmospheric CH4 concentrations. But over oceans, reference data are limited. We combine various ship and aircraft observations with the help of atmospheric chemistry models to derive observation-based column-averaged mixing ratios of CH4 (obs. XCH4). We discuss three different approaches and demonstrate the applicability of the new reference dataset for carbon cycle studies and satellite evaluation.