globalchange  > 气候变化与战略
DOI: 10.1073/pnas.2014761117
论文题名:
Revisiting particle dry deposition and its role in radiative effect estimates
作者: Emerson E.W.; Hodshire A.L.; DeBolt H.M.; Bilsback K.R.; Pierce J.R.; McMeeking G.R.; Farmer D.K.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期:42
起始页码: 26076
结束页码: 26082
语种: 英语
英文关键词: Aerosols ; Dry deposition ; Eddy covariance ; Radiation
Scopus关键词: aerosol ; article ; Colorado ; concentration (parameter) ; dry deposition ; Eddy covariance ; forest ; grassland ; Oklahoma ; radiative forcing ; uncertainty ; velocity
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163985
Appears in Collections:气候变化与战略

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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

Recommended Citation:
Emerson E.W.,Hodshire A.L.,DeBolt H.M.,et al. Revisiting particle dry deposition and its role in radiative effect estimates[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(42)
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