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© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 12 Jun 2019

Submitted as: research article | 12 Jun 2019

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This discussion paper is a preprint. A revision of the manuscript is under review for the journal Atmospheric Chemistry and Physics (ACP).

Spatiotemporal variation of aerosol and potential long-range transport impact over Tibetan Plateau, China

Jun Zhu1,2,3, Xiangao Xia2,4, Huizheng Che3, Jun Wang5, Zhiyuan Cong6, Tianliang Zhao1, Shichang Kang7,9, Xuelei Zhang8, Xingna Yu1, and Yanlin Zhang1 Jun Zhu et al.
  • 1Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Key Laboratory for Aerosol–Cloud–Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing 210044, China
  • 2LAGEO, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
  • 3State Key Laboratory of Severe Weather (LASW) and Key Laboratory of Atmospheric Chemistry (LAC), Chinese Academy of Meteorological Sciences, CMA, Beijing, 100081, China
  • 4University of Chinese Academy of Sciences, Beijing, 100049, China
  • 5Center of Global and Regional Environmental Research and Department of Chemical and Biochemical Engineering, University of Iowa, Iowa City, Iowa, USA
  • 6Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
  • 7State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
  • 8Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China
  • 9CAS Center for Excellence in Tibetan Plateau Earth Sciences, China

Abstract. The long-term temporal-spatial variations of aerosol optical properties in Tibetan Plateau (TP) and the potential long-range transport from surrounding areas to TP were analyzed in this work, by using multiple years of sunphotometer measurements (CE318) at five stations in TP, satellite aerosol productions from Moderate Resolution Imaging Spectroradiometer (MODIS) and Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP), back-trajectory analysis from the Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) and model simulation of the Goddard Earth Observing System (GEOS)-Chem chemistry transport model. The results from ground-based observations show that the annual aerosol optical depth (AOD) at most TP sites increased in the past decades with trends of 0.001 ± 0.003/year at Lhasa, 0.013 ± 0.003/year at Mt_WLG, 0.002 ± 0.002/year at NAM_CO, and 0.000 ± 0.002/year at QOMS_CAS. The increasing trend is also found for the aerosol Extinction Ångstrom exponent (EAE) at most sites, except for Mt_WLG sites with an obvious decreasing trend. Spatially, the AOD observed from MODIS shows negative trends in the northwest edge closed to the Taklimakan Desert and east of the Qaidam Basin and slightly positive trends in most of the other area of TP. Different aerosol types and sources contribute to the polluted day (with CE318 AOD at 440 nm > 0.4) in the five sites of TP: dust dominant in Lhasa, Mt_WLG and Muztagh with sources from the Taklimakan Desert but fine aerosol pollution dominant at NAM_CO and QOMS_CAS with the transport from South Asia. A case of aerosol pollution at Lhasa, NAM_CO and QOMS_CAS during 28 April–3 May 2016 reveals that the smoke aerosols in South Asia were lifted up to 10 km and transported to TP, while the dust from Taklimakan Desert could climb the north slope of TP and then be transported to center TP. The long-range transport thereby seriously impact aerosol loading over the TP.

Jun Zhu et al.
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Jun Zhu et al.
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Short summary
The long-term temporal-spatial variations of the aerosol optical properties over TP based on the multiple ground-based sunphotometer sites and the MODIS product is presented. Besides, the aerosol pollution and aerosol transport processes over TP was also analyzed by the observation and models. The results in this region could help reduce the assessment uncertainties of aerosol radiative forcing and provide more information on aerosol transportation.
The long-term temporal-spatial variations of the aerosol optical properties over TP based on the...