Abstract:Based on the 10-years (1995~2004) aerosol simulations of the global aerosol model GEM-AQ/EC, Asian dust aerosol in respect of source and sink distributions and vertical profiles was investigated. Two major dust source regions in East Asia were distributed 1) over the desert areas from southern Mongolia to the middle and west Inner Mongolia; 2) the Taklimakan Desert in southern Xinjiang; Dust emissions reached the peak in spring, accounting for 66.81% of the annual dust emissions with the maximum value of 15.29 Mt in April. The Asian dust emissions weaken in summer, level up in autumn and bottom in winter. The significant inter-annual variations and an increasing trend in East Asian dust emissions were experienced over 1995~2004. The high dust depositions were found over East Asian emission areas. Dry dust deposition was a dominant dust removal process over deserts and the surrounding regions, while wet dust deposition was the major process over the long range transport path ways from Northeast China, Southern China, Korea, Japan to West Pacific. Dust deposition had the same seasonal variation to the dust emission and but an increasing trend over the 10 years. The regional dust emissions from East Asian dominated changes of East Asian dust aerosol, the maximum net dust sink areas were concentrated over the immediate downwind regions from the Loess Plateau to the western part of the North China Plain. Taking Asian East region as a whole, East Asian region were the net source of dust aerosol in spring, summer and autumn and but a dust sink in winter, when the strongest westerly jets import dust aerosol from dust sources beyond East Asia into East Asia. Over the most regions of East Asian continent, the vertical profiles of dust aerosols were structured with the high values below 3km in the lower troposphere, while the high dust concentrations were centered around 5km height in the mid-troposphere over the western Pacific and between 6km and 8km in the mid-and upper troposphere north of the desert areas.
熊洁, 赵天良, 韩永翔, Gong S L. 1995~2004年东亚沙尘气溶胶的模拟源汇分布及垂直结构[J]. 中国环境科学, 2013, 33(6): 961-968.
XIONG Jie, ZHAO Tian-Liang, HAN Yong-Xiang, Gong S L. A simulation of dust aerosols source and sink distributions and vertical profiles in East Asia over 1995~2004. . CHINA ENVIRONMENTAL SCIENCECE, 2013, 33(6): 961-968.