气候变化领域集成服务门户(CCPortal): The Global Budget of Atmospheric Methanol: New Constraints on Secondary, Oceanic, and Terrestrial Sources

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DOI	10.1029/2020JD033439
	The Global Budget of Atmospheric Methanol: New Constraints on Secondary, Oceanic, and Terrestrial Sources
	Bates K.H.; Jacob D.J.; Wang S.; Hornbrook R.S.; Apel E.C.; Kim M.J.; Millet D.B.; Wells K.C.; Chen X.; Brewer J.F.; Ray E.A.; Commane R.; Diskin G.S.; Wofsy S.C.
发表日期	2021
ISSN	2169897X
卷号	126 期号:4
英文摘要	Methanol is the second-most abundant organic gas in the remote atmosphere after methane, but its sources are poorly understood. Here, we report a global budget of methanol constrained by observations from the ATom aircraft campaign as implemented in the GEOS-Chem global atmospheric chemistry model. ATom observations under background marine conditions can be fit in the model with a surface ocean methanol concentration of 61 nM and a methanol yield of 13% from the newly implemented CH3O2 + OH reaction. While terrestrial biogenic emissions dominate the global atmospheric methanol budget, secondary production from CH3O2 + OH and CH3O2 + CH3O2 accounts for 29% of the total methanol source, and makes up the majority of methanol in the background marine atmosphere sampled by ATom. Net emission from the ocean is comparatively minor, particularly because of rapid deposition from the marine boundary layer. Aged anthropogenic and pyrogenic plumes sampled in ATom featured large methanol enhancements to constrain the corresponding sources. Methanol enhancements in pyrogenic plumes did not decay with age, implying in-plume secondary production. The atmospheric lifetime of methanol is only 5.3 days, reflecting losses of comparable magnitude from photooxidation and deposition. GEOS-Chem model results indicate that methanol photochemistry contributes 5%, 4%, and 1.5% of the tropospheric burdens of formaldehyde, CO, and ozone, respectively, with particularly pronounced effects in the tropical upper troposphere. The CH3O2 + OH reaction has substantial impacts on radical budgets throughout the troposphere and should be included in global atmospheric chemistry models. © 2021. The Authors.
英文关键词	air-sea exchange; atmospheric tomography; chemical transport modeling; methanol
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185455
作者单位	School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, United States; Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, United States; Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, United States; Everactive, Inc., Charlottesville, VA, United States; Department of Soil, Water, and Climate, University of Minnesota, St. Paul, MN, United States; Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO, United States; Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, United States; Department of Earth and Environmental Sciences, Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States; Langley Research Center, National Aeronautics and Space Administration, Hampton, VA, United States; Department of Earth and Planetary Sciences, Harvard University, Cambridg...
推荐引用方式 GB/T 7714	Bates K.H.,Jacob D.J.,Wang S.,et al. The Global Budget of Atmospheric Methanol: New Constraints on Secondary, Oceanic, and Terrestrial Sources[J],2021,126(4).
APA	Bates K.H..,Jacob D.J..,Wang S..,Hornbrook R.S..,Apel E.C..,...&Wofsy S.C..(2021).The Global Budget of Atmospheric Methanol: New Constraints on Secondary, Oceanic, and Terrestrial Sources.Journal of Geophysical Research: Atmospheres,126(4).
MLA	Bates K.H.,et al."The Global Budget of Atmospheric Methanol: New Constraints on Secondary, Oceanic, and Terrestrial Sources".Journal of Geophysical Research: Atmospheres 126.4(2021).