Suppression of precipitation by dust particles originated in the Tibetan Plateau |
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| Authors: | Yongxiang Han Xiaomin Fang Tianliang Zhao Huzhi Bai Shichang Kang Lianchun Song |
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| Affiliation: | 1. Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, USA;2. Earth Sciences Division, NASA Goddard Space Flight Center, Greenbelt, MD, USA;3. Joint Center for Earth Science and Technology, University of Maryland at Baltimore County, Baltimore, MD, USA;4. Cooperative Institute for Marine and Atmospheric Studies, Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, USA;5. NASA Langley Research Center, Hampton, VA, USA;6. Universities Space Research Association, Columbia, MD, USA;7. Department of Physics, University of Maryland at Baltimore County, Baltimore, MD, USA;1. Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences (CAS), 100101, Beijing, China;2. State Key Laboratory of Cryospheric Science, Cold and Arid Regions Environment and Engineering Research Institute, CAS, 730000, Lanzhou, China;3. CAS Center for Excellence in Tibetan Plateau Earth Sciences, 100101, Beijing, China;4. Laboratory of Green Chemistry, Lappeenranta University of Technology, Sammonkatu 12, FI-50130, Mikkeli, Finland |
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| Abstract: | Dust aerosols play an important role in modulating the hydrologic cycle. The Tibetan Plateau (TP) is little polluted by human activities as an ideal site to study the effect of dust aerosol on precipitation. In this study, observational data of dust storms and precipitation in the TP and its vicinities as well as CALIPSO satellite data were used to analyze the distributions and vertical structure of dust storms on the plateau. The results showed that dust storms occur with high frequency and raise dust particles into the troposphere from ground level to a height of 5–9 km to modulate the hydrologic cycle in the TP. There are significant negative correlations between dust aerosol and precipitation in the dust source regions during the period of both 40 and 200 years. It is found that the role of precipitation in suppressing dust storms could be unimportant, while dust aerosol may play an important role in suppressing precipitation in the hinterland of the TP. Our study provides a potential approach to better understand the climate changes in the TP. |
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