气候变化领域集成服务门户(CCPortal): A high-resolution satellite-based map of global methane emissions reveals missing wetland, fossil fuel, and monsoon sources

CCPortal

DOI	10.5194/acp-23-3325-2023
	A high-resolution satellite-based map of global methane emissions reveals missing wetland, fossil fuel, and monsoon sources
	Yu, Xueying; Millet, Dylan B.; Henze, Daven K.; Turner, Alexander J.; Delgado, Alba Lorente; Bloom, A. Anthony; Sheng, Jianxiong
发表日期	2023
ISSN	1680-7316
EISSN	1680-7324
起始页码	3325
结束页码	3346
卷号	23 期号:5 页码:22
英文摘要	We interpret space-borne observations from the TROPOspheric Monitoring Instrument (TROPOMI) in a multi-inversion framework to characterize the 2018-2019 global methane budget. Evaluation of the inverse solutions indicates that simultaneous source + sink optimization using methane observations alone remains an ill-posed problem - even with the dense TROPOMI sampling coverage. Employing remote carbon monoxide (CO) and hydroxyl radical (OH) observations with independent methane measurements to distinguish between candidate solutions, we infer from TROPOMI a global methane source of 587 (586-589) Tg yr(-1) and sink of 571 Tg yr(-1) for our analysis period. We apply a new downscaling method to map the derived monthly emissions to 0.1 degrees x 0.1 degrees resolution, using the results to uncover key gaps in the prior methane budget. The TROPOMI data point to an underestimate of tropical wetland emissions (a posteriori increase of +13 % [6 %-25 %] or 20 [7-25] Tg yr(-1)), with adjustments following regional hydrology. Some simple wetland parameterizations represent these patterns as accurately as more sophisticated process-based models. Emissions from fossil fuel activities are strongly underestimated over the Middle East (+5 [2-6] Tg yr(-1) a posteriori increase) and over Venezuela. The TROPOMI observations also reveal many fossil fuel emission hotspots missing from the prior inventory, including over Mexico, Oman, Yemen, Turkmenistan, Iran, Iraq, Libya, and Algeria. Agricultural methane sources are underestimated in India, Brazil, the California Central Valley, and Asia. Overall, anthropogenic sources worldwide are increased by +19 [11-31] Tg yr(-1) over the prior estimate. More than 45 % of this adjustment occurs over India and Southeast Asia during the summer monsoon (+8.5 [3.1-10.7] Tg in July-October), likely due to rainfall-enhanced emissions from rice, manure, and landfills/sewers, which increase during this season along with the natural wetland source.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000953028200001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/272972
作者单位	University of Minnesota System; Stanford University; University of Colorado System; University of Colorado Boulder; University of Washington; University of Washington Seattle; California Institute of Technology; National Aeronautics & Space Administration (NASA); NASA Jet Propulsion Laboratory (JPL); Massachusetts Institute of Technology (MIT)
推荐引用方式 GB/T 7714	Yu, Xueying,Millet, Dylan B.,Henze, Daven K.,et al. A high-resolution satellite-based map of global methane emissions reveals missing wetland, fossil fuel, and monsoon sources[J],2023,23(5):22.
APA	Yu, Xueying.,Millet, Dylan B..,Henze, Daven K..,Turner, Alexander J..,Delgado, Alba Lorente.,...&Sheng, Jianxiong.(2023).A high-resolution satellite-based map of global methane emissions reveals missing wetland, fossil fuel, and monsoon sources.ATMOSPHERIC CHEMISTRY AND PHYSICS,23(5),22.
MLA	Yu, Xueying,et al."A high-resolution satellite-based map of global methane emissions reveals missing wetland, fossil fuel, and monsoon sources".ATMOSPHERIC CHEMISTRY AND PHYSICS 23.5(2023):22.