气候变化领域集成服务门户(CCPortal): Contribution of the world's main dust source regions to the global cycle of desert dust

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DOI	10.5194/acp-21-8169-2021
	Contribution of the world's main dust source regions to the global cycle of desert dust
	Kok J.F.; Adebiyi A.A.; Albani S.; Balkanski Y.; Checa-Garcia R.; Chin M.; Colarco P.R.; Hamilton D.S.; Huang Y.; Ito A.; Klose M.; Li L.; Mahowald N.M.; Miller R.L.; Obiso V.; Pérez García-Pando C.; Rocha-Lima A.; Wan J.S.
发表日期	2021
ISSN	1680-7316
起始页码	8169
结束页码	8193
卷号	21 期号:10
英文摘要	Even though desert dust is the most abundant aerosol by mass in Earth s atmosphere, the relative contributions of the world s major source regions to the global dust cycle remain poorly constrained. This problem hinders accounting for the potentially large impact of regional differences in dust properties on clouds, the Earth s energy balance, and terrestrial and marine biogeochemical cycles. Here, we constrain the contribution of each of the world s main dust source regions to the global dust cycle. We use an analytical framework that integrates an ensemble of global aerosol model simulations with observationally informed constraints on the dust size distribution, extinction efficiency, and regional dust aerosol optical depth (DAOD). We obtain a dataset that constrains the relative contribution of nine major source regions to size-resolved dust emission, atmospheric loading, DAOD, concentration, and deposition flux. We find that the 22 29 Tg (1 standard error range) global loading of dust with a geometric diameter up to 20 um is partitioned as follows: North African source regions contribute 50% (11 15 Tg), Asian source regions contribute 40% (8 13 Tg), and North American and Southern Hemisphere regions contribute 10% (1.8 3.2 Tg). These results suggest that current models on average overestimate the contribution of North African sources to atmospheric dust loading at 65 %, while underestimating the contribution of Asian dust at 30 %. Our results further show that each source region s dust loading peaks in local spring and summer, which is partially driven by increased dust lifetime in those seasons. We also quantify the dust deposition flux to the Amazon rainforest to be 10 Tg yr1, which is a factor of 2 3 less than inferred from satellite data by previous work that likely overestimated dust deposition by underestimating the dust mass extinction efficiency. The data obtained in this paper can be used to obtain improved constraints on dust impacts on clouds, climate, biogeochemical cycles, and other parts of the Earth system. © 2021 BMJ Publishing Group. All rights reserved.
语种	英语
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/246855
作者单位	Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA 90095, United States; Department of Environmental and Earth Sciences, University of Milano-Bicocca, Milan, Italy; Laboratoire des Sciences du Climat et de l'Environnement, CEA-CNRS-UVSQ-UPSaclay, Gif-sur-Yvette, France; Atmospheric Chemistry and Dynamics Laboratory, Nasa Goddard Space Flight Center, Greenbelt, MD 20771, United States; Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY 14850, United States; Yokohama Institute for Earth Sciences, Jamstec, Yokohama, Kanagawa, 236-0001, Japan; Barcelona Supercomputing Center (BSC), Barcelona, 08034, Spain; Nasa Goddard Institute for Space Studies, New York, NY 10025, United States; Icrea, Catalan Institution for Research and Advanced Studies, Barcelona, 08010, Spain; Physics Department, Umbc, Baltimore, MD, United States; Joint Center Joint Center for Earth Systems Technology, Umbc, Baltimore, MD, United States; Institute of Meteorology and ...
推荐引用方式 GB/T 7714	Kok J.F.,Adebiyi A.A.,Albani S.,et al. Contribution of the world's main dust source regions to the global cycle of desert dust[J],2021,21(10).
APA	Kok J.F..,Adebiyi A.A..,Albani S..,Balkanski Y..,Checa-Garcia R..,...&Wan J.S..(2021).Contribution of the world's main dust source regions to the global cycle of desert dust.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(10).
MLA	Kok J.F.,et al."Contribution of the world's main dust source regions to the global cycle of desert dust".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.10(2021).