External contribution of the Tibetan Plateau dust

doi:10.7522/j.issn.1000-694X.2023.00104

Journal of Desert Research ›› 2024, Vol. 44 ›› Issue (2): 57-65.DOI: 10.7522/j.issn.1000-694X.2023.00104

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External contribution of the Tibetan Plateau dust

Jiahui Cao(), Siyu Chen(), Chao Zhang, Lulu Lian, Dan Zhao, Shikang Du

College of Atmospheric Sciences / Ministry of Education Key Laboratory for Semi-Arid Climate Change，Lanzhou University，Lanzhou 730000，China

Received:2023-06-16 Revised:2023-07-13 Online:2024-03-20 Published:2024-03-19
Contact: Siyu Chen

Abstract

Abstract:

The source of dust over the Tibetan Plateau is an important issue in the field of the plateau environment and climate. Previous studies have found that dust over the plateau comes from local release and transport by external deserts， but there are still deficiencies in quantitative analysis and sensible heat analysis of external deserts and seasonal contribution of dust over the plateau. In this paper， WRF-Chem （Weather Research and Forecasting coupled with Chemistry） is employed to study the seasonal distribution and transport of dust over the Tibetan Plateau and surrounding areas. The results show that the dust column loading seasonal variation trend is consistent with sensible heat in the dust source areas. Dust released by East Asian deserts （Gurbantunggut Desert， Taklimakan Desert， Gobi Desert） and South Asian desert （Thar Desert） accounts for more than 80% of total dust aerosol over the Tibetan Plateau. Dust released by The Taklimakan Desert contributes the most to the dust over the Tibetan Plateau in each season， at 40%. The contribution of Thar desert to plateau dust in spring and summer is relatively significant （about 25%）.

Key words: Tibetan Plateau, dust transport, WRF-Chem, external contribution

CLC Number:

P421

Jiahui Cao, Siyu Chen, Chao Zhang, Lulu Lian, Dan Zhao, Shikang Du. External contribution of the Tibetan Plateau dust[J]. Journal of Desert Research, 2024, 44(2): 57-65.

Figures/Tables 11

Table 1 WRF-Chem configuration options for physical and chemical parameterizations

物理化学过程	设置
微物理方案	Morrison two-moment scheme
长波辐射方案	RRTMG
短波辐射方案	RRTMG
陆面方案	Noah land-surface model
积云参数化方案	Grell 3D
沙尘排放方案	GOCART
气溶胶方案	MOSAIC-4Bin

Table 2 WRF-Chem experimental design

试验设置	试验描述
标准试验	打开模拟区域内所有沙尘源
敏感性实验1	关闭塔克拉玛干沙漠沙源
敏感性实验2	关闭塔尔沙漠沙源
敏感性实验3	关闭戈壁沙漠沙源
敏感性实验4	关闭古尔班通古特沙漠沙源
敏感性实验5	关闭中亚沙漠沙源

Fig.1 Spatial distributions of wind erosion in the simulated area

Fig.2 Seasonal average comparison of MISR 550 nm AOD （first row） and WRF-Chem simulation 550 nm AOD （second row） in 2018

Fig.3 Seasonal average distribution of dust column loading （unit： g·m-2） over the Tibetan Plateau and surrounding areas in 2018

Fig.4 Seasonal average of dust column loading in the desert surrounding the Tibetan Plateau in 2018

Fig.5 Comparison of the monthly mean sensible heat simulation results over the eastern Tibetan Plateau in 2018 with the multi-year monthly mean sensible heat from 32 observation stations located in the eastern Tibetan Plateau during 1960-2016

Fig.6 Seasonal average distribution of sensible heat （unit： W·m-2） over the Tibetan Plateau and surrounding areas in 2018

Fig.7 Seasonal average dust column loading （unit： g·m-2） and sensible heat （unit： W·m-2） over the desert surrounding the Tibetan Plateau in 2018

Fig.8 Seasonal average dust column loading over the Tibetan Plateau （unit： mg·m-2）

Fig.9 The contribution of deserts around the Tibetan Plateau to the seasonal average dust column loading over the Tibetan Plateau

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External contribution of the Tibetan Plateau dust

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