气候变化领域集成服务门户(CCPortal): Modeling dust sources, transport, and radiative effects at different altitudes over the Tibetan Plateau

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DOI	10.5194/acp-20-1507-2020
	Modeling dust sources, transport, and radiative effects at different altitudes over the Tibetan Plateau
	Hu Z.; Huang J.; Zhao C.; Jin Q.; Ma Y.; Yang B.
发表日期	2020
ISSN	16807316
起始页码	1507
结束页码	1529
卷号	20 期号:3
英文摘要	Mineral dust plays an important role in the climate of the Tibetan Plateau (TP) by modifying the radiation budget, cloud macro- and microphysics, precipitation, and snow albedo. Meanwhile, the TP, with the highest topography in the world, can affect intercontinental transport of dust plumes and induce typical distribution characteristics of dust at different altitudes. In this study, we conduct a quasi-global simulation to investigate the characteristics of dust source contribution and transport over the TP at different altitudes by using a fully coupled meteorology-chemistry model, the Weather Research and Forecasting model with chemistry (WRF-Chem), with a tracer-tagging technique. Generally, the simulation reasonably captures the spatial distribution of satellite-retrieved dust aerosol optical depth (AOD) at different altitudes. Model results show that dust particles are emitted into atmosphere through updrafts over major desert regions and then transported to the TP. The East Asian dust (mainly from the Gobi and Taklamakan deserts) is transported southward and is lifted up to the TP, contributing a mass loading of 50mgm-2 at a height of 3km and 5mgm-2 at a height of 12km over the northern slope of the TP. Dust from North Africa and the Middle East are concentrated over both of the northern and southern slopes below 6km, where mass loadings range from 10 to 100 and 1 to 10mgm-2 below 3km and above 9km, respectively. As the dust is transported to the north and over the TP, mass loadings are 5-10mgm-2 above a height of 6km. The dust mass flux carried from East Asia to the TP is 7.9Tgyr-1, mostly occurring at heights of 3-6km. The dust particles from North Africa and the Middle East are transported eastward following the westerly jet and then are carried into the TP at the west side with dust mass fluxes of 7.8 and 26.6Tgyr-1, respectively. The maximum mass flux of the North African dust mainly occurs at 0-3km (3.9Tgyr-1), while the Middle Eastern dust occurs at 6-9km (12.3Tgyr-1). The dust outflow occurs on the east side (-17.89Tgyr-1) and south side (-11.22Tgyr-1) of the TP, with a peak value (8.7Tgyr-1) at 6-9km. Moreover, the dust (by mass) is concentrated within the size range of 1.25-5.0μm and the dust (by particle number) is concentrated in the size range of 0.156-1.25μm. Compared with other aerosols, the dust contributes to more than 50% of the total AOD over the TP. The direct radiative forcing induced by the dust is -1.28Wm-2 at the top of the atmosphere (cooling), 0.41Wm-2 in the atmosphere (warming), and -1.68Wm-2 at the surface (cooling). Our quantitative analyses of the dust contributions from different source regions and the associated radiative forcing can help us to better understand the role of dust on the climate over the TP and surrounding regions. © 2020 Copernicus GmbH. All rights reserved.
关键词	aerosol altitude atmospheric modeling dust long range transport optical depth radiative forcing source identification spatial distribution China Qinghai-Xizang Plateau
语种	英语
来源机构	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132249
推荐引用方式 GB/T 7714	Hu Z.,Huang J.,Zhao C.,et al. Modeling dust sources, transport, and radiative effects at different altitudes over the Tibetan Plateau[J]. Atmospheric Chemistry and Physics,2020,20(3).
APA	Hu Z.,Huang J.,Zhao C.,Jin Q.,Ma Y.,&Yang B..(2020).Modeling dust sources, transport, and radiative effects at different altitudes over the Tibetan Plateau.,20(3).
MLA	Hu Z.,et al."Modeling dust sources, transport, and radiative effects at different altitudes over the Tibetan Plateau".20.3(2020).