Case study of dust event sources from the Gobi and Taklamakan deserts:An investigation of the horizontal evolution and topographical effect using numerical modeling and remote sensing  

作　　者：Jin Fan Xiaoying Yue Qinghua Sun Shigong Wang 

机构地区：[1]College of Atmospheric Sciences,Lanzhou University,Lanzhou 730000,Gansu,China [2]College of Geography and Environmental Science,Northwest Normal University,Lanzhou 7S0070,Gansu,China [3]Division of Environmental Health Sciences,College of Public Health,The Ohio State University,Columbus,OH 43210,USA [4]College of Atmospheric Sciences,Chengdu University of Information Technology,Chengdu 610103,Sichuan,China

出　　处：《Journal of Environmental Sciences》2017年第6期62-70,共9页环境科学学报（英文版）

基　　金：sponsored in part by the China Scholarship Council;the National Natural Science Foundation of China(No.41075103);the National Natural Science Foundation of China(No.41075102);the National Natural Science Foundation of China(No.41305105)

摘　　要：A severe dust event occurred from April 23 to April 27, 2014, in East Asia. A state-of-the-art online atmospheric chemistry model, WRF/Chem, was combined with a dust model, GOCART, to better understand the entire process of this event. The natural color images and aerosol optical depth （AOD） over the dust source region are derived from datasets of moderate resolution imaging spectroradiometer （MODIS） loaded on a NASA Aqua satellite to trace the dust variation and to verify the model results. Several meteorological conditions, such as pressure, temperature, wind vectors and relative humidity, are used to analyze meteorological dynamic. The results suggest that the dust emission occurred only on April 23 and 24, although this event lasted for 5 days. The Gobi Desert was the main source for this event, and the Taklamakan Desert played no important role. This study also suggested that the landform of the source region could remarkably interfere with a dust event. The Tarim Basin has a topographical effect as a ＂dust reservoir＂ and can store unsettled dust, which can be released again as a second source, making a dust event longer and heavier.A severe dust event occurred from April 23 to April 27, 2014, in East Asia. A state-of-the-art online atmospheric chemistry model, WRF/Chem, was combined with a dust model, GOCART, to better understand the entire process of this event. The natural color images and aerosol optical depth （AOD） over the dust source region are derived from datasets of moderate resolution imaging spectroradiometer （MODIS） loaded on a NASA Aqua satellite to trace the dust variation and to verify the model results. Several meteorological conditions, such as pressure, temperature, wind vectors and relative humidity, are used to analyze meteorological dynamic. The results suggest that the dust emission occurred only on April 23 and 24, although this event lasted for 5 days. The Gobi Desert was the main source for this event, and the Taklamakan Desert played no important role. This study also suggested that the landform of the source region could remarkably interfere with a dust event. The Tarim Basin has a topographical effect as a ＂dust reservoir＂ and can store unsettled dust, which can be released again as a second source, making a dust event longer and heavier.

关 键 词：East Asia dustWRFMODISTarim BasinTopographical effect 

分 类 号：X513[环境科学与工程—环境工程]