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Aug.  2019

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# Anthropogenic Aerosol Pollution over the Eastern Slope of the Tibetan Plateau

• In this study, a combination of satellite observations and reanalysis datasets is used to analyze the spatiotemporal distribution, classification and source of pollutants over the eastern slope of the Tibetan Plateau (ESTP). The aerosol optical depth (AOD) over the ESTP is extremely large and even larger than some important industrialized regions and deserts. The main aerosol component over the ESTP is sulfate, followed by carbonaceous and dust aerosols. Local emissions related to human activity directly contribute to the accumulation of sulfate and carbonaceous aerosols over the Sichuan Basin. In addition, in spring, abundant carbonaceous aerosols emitted from forest, grassland and savanna fires in Southeast Asia can be transported by the prevailing southwesterly wind to southern China and the ESTP. The dust AOD over the ESTP peaks in spring because of the transport from the Taklimakan and Gobi deserts. Additionally, the high aerosol loading over the ESTP is also directly related to the meteorological background. Due to the special topography, the terrain-driven circulation can trap aerosols in the Sichuan Basin and these aerosols can climb along the ESTP due to the perennial updraft. The aerosol loading is lowest in summer because of effective wet deposition induced by the strong precipitation and better dispersion conditions due to the larger vertical temperature gradients and ascending air movement enhanced by the plateau heat pump effect. In contrast, the aerosol loading is greatest in winter. Abundant anthropogenic aerosols over the ESTP may generate some climatic and environmental risks and consequently greatly influence the downstream regions.
摘要: 本文结合卫星观测和再分析数据分析了青藏高原东坡污染物的时空分布、分类和源。青藏高原东坡气溶胶光学厚度较大，甚至超过了一些重要的工业区和沙漠。青藏高原东坡气溶胶的主要成分是硫酸盐，其次是含碳气溶胶和沙尘。与人类活动有关的局地排放直接导致了四川盆地硫酸盐和含碳气溶胶的积累。此外，春季东南亚森林、草原和稀疏灌木火灾产生了大量的含碳气溶胶，这些含碳气溶胶可以通过盛行西南风输送到华南地区和青藏高原东部。由于来自塔克拉玛干沙漠和戈壁沙漠的气溶胶输送，青藏高原东坡沙尘气溶胶光学厚度在夏季达到峰值。此外，青藏高原东坡气溶胶聚集也与气候背景直接相关。特殊地形驱动的局地环流可以将气溶胶局限在四川盆地内部，青藏高原东坡常年存在上升气流，这些气溶胶可以沿着青藏高原东坡抬升到高空。夏季，由于较大的垂直温度递减率和高原热力泵效应增强的上升运动，扩散条件较好，再加上强降水的有效清除，青藏高原东坡气溶胶含量最低。冬季，与之相反。青藏高原东坡的大量人为气溶胶可能会带来一些气候和环境风险，对下游地区也会产生影响。
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## Manuscript History

Manuscript revised: 04 April 2019
Manuscript accepted: 30 April 2019
###### 通讯作者: 陈斌, bchen63@163.com
• 1.

沈阳化工大学材料科学与工程学院 沈阳 110142

## Anthropogenic Aerosol Pollution over the Eastern Slope of the Tibetan Plateau

###### Corresponding author: Yuzhi LIU, liuyzh@lzu.edu.cn;
• 1. Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China
• 2. Zibo Meteorological Bureau, Zibo 255000, China

Abstract: In this study, a combination of satellite observations and reanalysis datasets is used to analyze the spatiotemporal distribution, classification and source of pollutants over the eastern slope of the Tibetan Plateau (ESTP). The aerosol optical depth (AOD) over the ESTP is extremely large and even larger than some important industrialized regions and deserts. The main aerosol component over the ESTP is sulfate, followed by carbonaceous and dust aerosols. Local emissions related to human activity directly contribute to the accumulation of sulfate and carbonaceous aerosols over the Sichuan Basin. In addition, in spring, abundant carbonaceous aerosols emitted from forest, grassland and savanna fires in Southeast Asia can be transported by the prevailing southwesterly wind to southern China and the ESTP. The dust AOD over the ESTP peaks in spring because of the transport from the Taklimakan and Gobi deserts. Additionally, the high aerosol loading over the ESTP is also directly related to the meteorological background. Due to the special topography, the terrain-driven circulation can trap aerosols in the Sichuan Basin and these aerosols can climb along the ESTP due to the perennial updraft. The aerosol loading is lowest in summer because of effective wet deposition induced by the strong precipitation and better dispersion conditions due to the larger vertical temperature gradients and ascending air movement enhanced by the plateau heat pump effect. In contrast, the aerosol loading is greatest in winter. Abundant anthropogenic aerosols over the ESTP may generate some climatic and environmental risks and consequently greatly influence the downstream regions.

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