气候变化领域集成服务门户(CCPortal): Climate Models and Remote Sensing Retrievals Neglect Substantial Desert Dust Asphericity

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DOI	10.1029/2019GL086592
	Climate Models and Remote Sensing Retrievals Neglect Substantial Desert Dust Asphericity
	Huang Y.; Kok J.F.; Kandler K.; Lindqvist H.; Nousiainen T.; Sakai T.; Adebiyi A.; Jokinen O.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:6
英文摘要	Climate models and remote sensing retrievals generally assume that dust aerosols are spherical or spheroidal. However, measurements show that dust aerosols deviate substantially from spherical and spheroidal shapes, as ratios of particle length to width (the aspect ratio) and height to width (height-to-width ratio) deviate substantially from unity. Here, we quantify dust asphericity by compiling dozens of measurements of aspect ratio and height-to-width ratio across the globe. We find that the length is on average 5 times larger than the height and that climate models and remote sensing retrievals underestimate this asphericity by a factor of ~3–5. Compiled measurements further suggest that North African dust becomes more aspherical during transport, whereas Asian dust might become less aspherical. We obtain globally-averaged shape distributions, from which we find that accounting for dust asphericity increases gravitational settling lifetime by ~20%. This increased lifetime helps explain the underestimation of coarse dust transport by models. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Aerosols; Aspect ratio; Aspherics; Dust; Remote sensing; African dust; Dust aerosols; Dust transport; Gravitational settlings; Measurements of; Particle length; Shape distribution; Spheroidal shapes; Climate models; aerosol; climate modeling; dust; remote sensing; Asia
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170588
作者单位	Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA, United States; Institute for Applied Geosciences, Technical University Darmstadt, Darmstadt, Germany; Finnish Meteorological Institute, Helsinki, Finland; Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Japan; Sole Proprietorship, Espoo, Finland
推荐引用方式 GB/T 7714	Huang Y.,Kok J.F.,Kandler K.,et al. Climate Models and Remote Sensing Retrievals Neglect Substantial Desert Dust Asphericity[J],2020,47(6).
APA	Huang Y..,Kok J.F..,Kandler K..,Lindqvist H..,Nousiainen T..,...&Jokinen O..(2020).Climate Models and Remote Sensing Retrievals Neglect Substantial Desert Dust Asphericity.Geophysical Research Letters,47(6).
MLA	Huang Y.,et al."Climate Models and Remote Sensing Retrievals Neglect Substantial Desert Dust Asphericity".Geophysical Research Letters 47.6(2020).