气候变化领域集成服务门户(CCPortal): Transport Patterns, Size Distributions, and Depolarization Characteristics of Dust Particles in East Asia in Spring 2018

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DOI	10.1029/2019JD031752
	Transport Patterns, Size Distributions, and Depolarization Characteristics of Dust Particles in East Asia in Spring 2018
	Tian Y.; Pan X.; Wang Z.; Wang D.; Ge B.; Liu X.; Zhang Y.; Liu H.; Lei S.; Yang T.; Fu P.; Sun Y.; Wang Z.
发表日期	2020
ISSN	2169897X
卷号	125 期号:16
英文摘要	The long-range transport of Asian dust and its complex interaction with anthropogenic pollutants have a significant yet poorly quantified effect on the global climate. In this study, dust events were observed based on an optical particle counter with a polarization detection module at an urban site in North China. The temporal variations in the size distribution and morphological changes of dust particles were analyzed. The results demonstrate that the dust events were induced by a deep Siberian low-pressure anomaly and/or Mongolian cyclone in the low troposphere. The morphology of dust particles, as indicated by the depolarization ratio (δ = s/(s + p), the ratio of the parallel signal to the total backscattering signal), varied significantly at different transport heights. A decreasing tendency was found when dust was trapped within the boundary layer over polluted areas, particularly when the atmospheric loading of pollutants and the relative humidity were high. During a typical polluted dust case, the δ value of mineral dust (Dp = 5 μm) decreased by 39%, as the conditions were stagnant in East China, consistent with the Cloud-Aerosol LIDAR with Orthogonal Polarization results. The morphological variation was evaluated according to the aspect ratio, presuming that the dust particles were ellipsoidal. The interaction between dust particles and water vapor could lead to an increase of at least 6% in volume when the relative humidity increased up to 90%. An aerosol classification based on δ values and size information could be performed to estimate the contributions of different aerosol types to pollution days. The results should be helpful for evaluating satellite-borne and ground-based light detection and ranging data analyses. ©2020. The Authors.
英文关键词	depolarization ratio; dust particles; mixing state; morphology
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185846
作者单位	State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China; Research Institute for Applied Mechanics (RIAM), Kyushu University, Fukuoka, Japan; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Science, Xiamen, China; Institute of Surface-Earth System Sciences, Tianjin University, Tianjin, China
推荐引用方式 GB/T 7714	Tian Y.,Pan X.,Wang Z.,et al. Transport Patterns, Size Distributions, and Depolarization Characteristics of Dust Particles in East Asia in Spring 2018[J],2020,125(16).
APA	Tian Y..,Pan X..,Wang Z..,Wang D..,Ge B..,...&Wang Z..(2020).Transport Patterns, Size Distributions, and Depolarization Characteristics of Dust Particles in East Asia in Spring 2018.Journal of Geophysical Research: Atmospheres,125(16).
MLA	Tian Y.,et al."Transport Patterns, Size Distributions, and Depolarization Characteristics of Dust Particles in East Asia in Spring 2018".Journal of Geophysical Research: Atmospheres 125.16(2020).