Global CH4 fluxes derived from JAXA/GOSAT lower-tropospheric partial column data and the CarbonTracker Europe-CH4 atmospheric inverse model
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| Název: | Global CH4 fluxes derived from JAXA/GOSAT lower-tropospheric partial column data and the CarbonTracker Europe-CH4 atmospheric inverse model |
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| Autoři: | A. Tsuruta, A. Kuze, K. Shiomi, F. Kataoka, N. Kikuchi, T. Aalto, L. Backman, E. Kivimäki, M. K. Tenkanen, K. McKain, O. E. García, F. Hase, R. Kivi, I. Morino, H. Ohyama, D. F. Pollard, M. K. Sha, K. Strong, R. Sussmann, Y. Te, V. A. Velazco, M. Vrekoussis, T. Warneke, M. Zhou, H. Suto |
| Zdroj: | Atmospheric Chemistry and Physics, Vol 25, Pp 7829-7862 (2025) |
| Informace o vydavateli: | Copernicus GmbH, 2025. |
| Rok vydání: | 2025 |
| Témata: | Chemistry, Physics, QC1-999, Global CH4 Fluxes, Partial Column Data, Lower Tropospheric, QD1-999, Atmospheric Inverse Model |
| Popis: | Satellite-driven inversions provide valuable information about methane (CH4) fluxes, but the assimilation of total column-averaged dry-air mole fractions of CH4 (XCH4) has been challenging. This study explores, for the first time, the potential of the new lower-tropospheric partial column (pXCH4_LT) GOSAT data, retrieved by the Japan Aerospace Exploration Agency (JAXA), to constrain global and regional CH4 fluxes. Using the CarbonTracker Europe-CH4 (CTE-CH4) atmospheric inverse model, we estimated CH4 fluxes between 2016–2019 by assimilating the JAXA/GOSAT pXCH4_LT and XCH4 data and surface CH4 observations independently of each other. The Northern Hemisphere CH4 fluxes derived from the pXCH4_LT data were similar to the estimates derived from the surface observations but were underestimated by about 35 Tg CH4 yr−1 (∼ 6 % of the global total) using the XCH4 data. For the Southern Hemisphere, the estimates from both GOSAT inversions were about 15–30 Tg CH4 yr−1 higher than those derived from surface data. The evaluations against independent data from the Atmospheric Tomography Mission aircraft campaign showed good agreement in the lower-tropospheric CH4 from the inversions using the pXCH4_LT and surface data. However, from these inversions, the modelled north–south gradients showed significant overestimation in the upper troposphere and stratosphere, possibly due to relatively uniform inter-hemispheric OH distributions that control CH4 sinks. Overall, we found that the use of the JAXA/GOSAT pXCH4_LT data shows considerable potential in constraining global and regional CH4 fluxes, advancing our understanding of the CH4 budget. |
| Druh dokumentu: | Article Other literature type |
| Popis souboru: | application/pdf |
| Jazyk: | English |
| ISSN: | 1680-7324 |
| DOI: | 10.5194/acp-25-7829-2025 |
| Přístupová URL adresa: | https://acp.copernicus.org/articles/25/7829/2025/ https://doaj.org/article/51c2ef89d1734dbfa8e65a0577d7b505 http://hdl.handle.net/20.500.11765/16657 |
| Rights: | CC BY |
| Přístupové číslo: | edsair.doi.dedup.....bf8719c2ece7694646f0380e88631479 |
| Databáze: | OpenAIRE |
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Nájsť tento článok vo Web of Science | Abstrakt: | Satellite-driven inversions provide valuable information about methane (CH4) fluxes, but the assimilation of total column-averaged dry-air mole fractions of CH4 (XCH4) has been challenging. This study explores, for the first time, the potential of the new lower-tropospheric partial column (pXCH4_LT) GOSAT data, retrieved by the Japan Aerospace Exploration Agency (JAXA), to constrain global and regional CH4 fluxes. Using the CarbonTracker Europe-CH4 (CTE-CH4) atmospheric inverse model, we estimated CH4 fluxes between 2016–2019 by assimilating the JAXA/GOSAT pXCH4_LT and XCH4 data and surface CH4 observations independently of each other. The Northern Hemisphere CH4 fluxes derived from the pXCH4_LT data were similar to the estimates derived from the surface observations but were underestimated by about 35 Tg CH4 yr−1 (∼ 6 % of the global total) using the XCH4 data. For the Southern Hemisphere, the estimates from both GOSAT inversions were about 15–30 Tg CH4 yr−1 higher than those derived from surface data. The evaluations against independent data from the Atmospheric Tomography Mission aircraft campaign showed good agreement in the lower-tropospheric CH4 from the inversions using the pXCH4_LT and surface data. However, from these inversions, the modelled north–south gradients showed significant overestimation in the upper troposphere and stratosphere, possibly due to relatively uniform inter-hemispheric OH distributions that control CH4 sinks. Overall, we found that the use of the JAXA/GOSAT pXCH4_LT data shows considerable potential in constraining global and regional CH4 fluxes, advancing our understanding of the CH4 budget. |
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| ISSN: | 16807324 |
| DOI: | 10.5194/acp-25-7829-2025 |