气候变化领域集成服务门户(CCPortal): Spatial and temporal variability in the hydroxyl (OH) radical: Understanding the role of large-scale climate features and their influence on OH through its dynamical and photochemical drivers

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DOI	10.5194/acp-21-6481-2021
	Spatial and temporal variability in the hydroxyl (OH) radical: Understanding the role of large-scale climate features and their influence on OH through its dynamical and photochemical drivers
	Anderson D.C.; Duncan B.N.; Fiore A.M.; Baublitz C.B.; Follette-Cook M.B.; Nicely J.M.; Wolfe G.M.
发表日期	2021
ISSN	1680-7316
起始页码	6481
结束页码	6508
卷号	21 期号:8
英文摘要	The hydroxyl radical (OH) is the primary atmospheric oxidant responsible for removing many important trace gases, including methane, from the atmosphere. Although robust relationships between OH drivers and modes of climate variability have been shown, the underlying mechanisms between OH and these climate modes, such as the El Niño-Southern Oscillation (ENSO), have not been thoroughly investigated. Here, we use a chemical transport model to perform a 38 year simulation of atmospheric chemistry, in conjunction with satellite observations, to understand the relationship between tropospheric OH and ENSO, Northern Hemispheric modes of variability, the Indian Ocean Dipole, and monsoons. Empirical orthogonal function (EOF) and regression analyses show that ENSO is the dominant mode of global OH variability in the tropospheric column and upper troposphere, responsible for approximately 30 % of the total variance in boreal winter. Reductions in OH due to El Niño are centered over the tropical Pacific and Australia and can be as high as 10 %-15 % in the tropospheric column. The relationship between ENSO and OH is driven by changes in nitrogen oxides in the upper troposphere and changes in water vapor and O1D in the lower troposphere. While the correlations between monsoons or other modes of variability and OH span smaller spatial scales than for ENSO, regional changes in OH can be significantly larger than those caused by ENSO. Similar relationships occur in multiple models that participated in the Chemistry-Climate Model Initiative (CCMI), suggesting that the dependence of OH interannual variability on these well-known modes of climate variability is robust. Finally, the spatial pattern and r2values of correlation between ENSO and modeled OH drivers - such as carbon monoxide, water vapor, lightning, and, to a lesser extent, NO2- closely agree with satellite observations. The ability of satellite products to capture the relationship between OH drivers and ENSO provides an avenue to an indirect OH observation strategy and new constraints on OH variability. © 2021 Copernicus GmbH. All rights reserved.
语种	英语
scopus关键词	atmospheric chemistry; El Nino-Southern Oscillation; empirical orthogonal function analysis; hydroxyl radical; Indian Ocean Dipole; photochemistry; regression analysis; satellite data; spatiotemporal analysis; Australia; Pacific Ocean; Pacific Ocean (Tropical)
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/246933
作者单位	Universities Space Research Association, GESTAR, Columbia, MD, United States; Atmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, United States; Department of Earth and Environmental Sciences, Columbia University, Palisades, NY, United States; GESTAR, Morgan State University, Baltimore, MD, United States; Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, United States
推荐引用方式 GB/T 7714	Anderson D.C.,Duncan B.N.,Fiore A.M.,et al. Spatial and temporal variability in the hydroxyl (OH) radical: Understanding the role of large-scale climate features and their influence on OH through its dynamical and photochemical drivers[J],2021,21(8).
APA	Anderson D.C..,Duncan B.N..,Fiore A.M..,Baublitz C.B..,Follette-Cook M.B..,...&Wolfe G.M..(2021).Spatial and temporal variability in the hydroxyl (OH) radical: Understanding the role of large-scale climate features and their influence on OH through its dynamical and photochemical drivers.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(8).
MLA	Anderson D.C.,et al."Spatial and temporal variability in the hydroxyl (OH) radical: Understanding the role of large-scale climate features and their influence on OH through its dynamical and photochemical drivers".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.8(2021).