气候变化领域集成服务门户(CCPortal): Comprehensive isoprene and terpene gas-phase chemistry improves simulated surface ozone in the southeastern US

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DOI	10.5194/acp-20-3739-2020
	Comprehensive isoprene and terpene gas-phase chemistry improves simulated surface ozone in the southeastern US
	Schwantes R.H.; Emmons L.K.; Orlando J.J.; Barth M.C.; Tyndall G.S.; Hall S.R.; Ullmann K.; St. Clair J.M.; Blake D.R.; Wisthaler A.; Paul V. Bui T.
发表日期	2020
ISSN	1680-7316
起始页码	3739
结束页码	3776
卷号	20 期号:6
英文摘要	Ozone is a greenhouse gas and air pollutant that is harmful to human health and plants. During the summer in the southeastern US, many regional and global models are biased high for surface ozone compared to observations. Past studies have suggested different solutions including the need for updates to model representation of clouds, chemistry, ozone deposition, and emissions of nitrogen oxides (NOx ) or biogenic hydrocarbons. Here, due to the high biogenic emissions in the southeastern US, more comprehensive and updated isoprene and terpene chemistry is added into CESM/CAM-chem (Community Earth System Model/Community Atmosphere Model with full chemistry) to evaluate the impact of chemistry on simulated ozone. Comparisons of the model results with data collected during the Studies of Emissions Atmospheric Composition, Clouds and Climate Coupling by Regional Surveys (SEAC4RS) field campaign and from the US EPA (Environmental Protection Agency) CASTNET (Clean Air Status and Trends Network) monitoring stations confirm the updated chemistry improves simulated surface ozone, ozone precursors, and NOx reservoir compounds. The isoprene and terpene chemistry updates reduce the bias in the daily maximum 8 h average (MDA8) surface ozone by up to 7 ppb. In the past, terpene oxidation in particular has been ignored or heavily reduced in chemical schemes used in many regional and global models, and this study demonstrates that comprehensive isoprene and terpene chemistry is needed to reduce surface ozone model biases. Sensitivity tests were performed in order to evaluate the impact of lingering uncertainties in isoprene and terpene oxidation on ozone. Results suggest that even though isoprene emissions are higher than terpene emissions in the southeastern US, remaining uncertainties in isoprene and terpene oxidation have similar impacts on ozone due to lower uncertainties in isoprene oxidation. Additionally, this study identifies the need for further constraints on the aerosol uptake of organic nitrates derived from isoprene and terpenes in order to reduce uncertainty in simulated ozone. Although the updates to isoprene and terpene chemistry greatly reduce the ozone bias in CAM-chem, a large bias remains. Evaluation against SEAC4RS field campaign results suggests future improvements to horizontal resolution and cloud parameterizations in CAM-chem may be particularly important for further reducing this bias. © 2019 Sissa Medialab Srl. All rights reserved.
语种	英语
scopus关键词	atmospheric chemistry; atmospheric pollution; biogenic emission; concentration (composition); isoprene; ozone; seasonal variation; terpene; United States
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/247881
作者单位	Atmospheric Chemistry Observations and Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO 80301, United States; Atmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD 20771, United States; Joint Center for Earth Systems Technology, University of Maryland, Baltimore County, Baltimore, MD 21228, United States; Department of Chemistry, University of California, Irvine, 570 Rowland Hall, Irvine, CA 92697-2025, United States; Institute for Ion Physics and Applied Physics, University of Innsbruck, Technikerstrasse 25, Innsbruck, 6020, Austria; Department of Chemistry, University of Oslo, P.O. Box 1033 Blindern, Oslo, 0315, Norway; Earth Science Division, NASA Ames Research Center, Moffett FieldCA 94035-1000, United States
推荐引用方式 GB/T 7714	Schwantes R.H.,Emmons L.K.,Orlando J.J.,et al. Comprehensive isoprene and terpene gas-phase chemistry improves simulated surface ozone in the southeastern US[J],2020,20(6).
APA	Schwantes R.H..,Emmons L.K..,Orlando J.J..,Barth M.C..,Tyndall G.S..,...&Paul V. Bui T..(2020).Comprehensive isoprene and terpene gas-phase chemistry improves simulated surface ozone in the southeastern US.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(6).
MLA	Schwantes R.H.,et al."Comprehensive isoprene and terpene gas-phase chemistry improves simulated surface ozone in the southeastern US".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.6(2020).