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DOI	10.1073/pnas.2014761117
	Revisiting particle dry deposition and its role in radiative effect estimates
	Emerson E.W.; Hodshire A.L.; DeBolt H.M.; Bilsback K.R.; Pierce J.R.; McMeeking G.R.; Farmer D.K.
发表日期	2020
ISSN	0027-8424
起始页码	26076
结束页码	26082
卷号	117 期号:42
英文摘要	Wet and dry deposition remove aerosols from the atmosphere, and these processes control aerosol lifetime and thus impact climate and air quality. Dry deposition is a significant source of aerosol uncertainty in global chemical transport and climate models. Dry deposition parameterizations in most global models were developed when few particle deposition measurements were available. However, new measurement techniques have enabled more size-resolved particle flux observations. We combined literature measurements with data that we collected over a grassland in Oklahoma and a pine forest in Colorado to develop a dry deposition parameterization. We find that relative to observations, previous parameterizations overestimated deposition of the accumulation and Aitken mode particles, and underestimated in the coarse mode. These systematic differences in observed and modeled accumulation mode particle deposition velocities are as large as an order of magnitude over terrestrial ecosystems. As accumulationmode particles formmost of the cloud condensation nuclei (CCN) that influence the indirect radiative effect, this model-measurement discrepancy in dry deposition alters modeled CCN and radiative forcing. We present a revised observationally driven parameterization for regional and global aerosol models. Using this revised dry deposition scheme in the Goddard Earth Observing System (GEOS)-Chem chemical transport model, we find that global surface accumulation-mode number concentrations increase by 62% and enhance the global combined anthropogenic and natural aerosol indirect effect by -0.63 W m-2. Our observationally constrained approach should reduce the uncertainty of particle dry deposition in global chemical transport models. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Aerosols; Dry deposition; Eddy covariance; Radiation
语种	英语
scopus关键词	aerosol; article; Colorado; concentration (parameter); dry deposition; Eddy covariance; forest; grassland; Oklahoma; radiative forcing; uncertainty; velocity
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160758
作者单位	Emerson, E.W., Department of Chemistry, Colorado State University, Fort Collins, CO 80523, United States, Handix Scientific LLC, Boulder, CO 80301, United States; Hodshire, A.L., Department of Chemistry, Colorado State University, Fort Collins, CO 80523, United States, Department of Atmospheric Sciences, Colorado State University, Fort Collins, CO 80523, United States; DeBolt, H.M., Department of Chemistry, Colorado State University, Fort Collins, CO 80523, United States; Bilsback, K.R., Department of Atmospheric Sciences, Colorado State University, Fort Collins, CO 80523, United States; Pierce, J.R., Department of Atmospheric Sciences, Colorado State University, Fort Collins, CO 80523, United States; McMeeking, G.R., Handix Scientific LLC, Boulder, CO 80301, United States; Farmer, D.K., Department of Chemistry, Colorado State University, Fort Collins, CO 80523, United States
推荐引用方式 GB/T 7714	Emerson E.W.,Hodshire A.L.,DeBolt H.M.,et al. Revisiting particle dry deposition and its role in radiative effect estimates[J],2020,117(42).
APA	Emerson E.W..,Hodshire A.L..,DeBolt H.M..,Bilsback K.R..,Pierce J.R..,...&Farmer D.K..(2020).Revisiting particle dry deposition and its role in radiative effect estimates.Proceedings of the National Academy of Sciences of the United States of America,117(42).
MLA	Emerson E.W.,et al."Revisiting particle dry deposition and its role in radiative effect estimates".Proceedings of the National Academy of Sciences of the United States of America 117.42(2020).