東亞沙塵分布、源匯及輸送特征的模擬研究
[Abstract]:Using the global aerosol model (GOCART) simulation results, the spatial and temporal distribution, emission and deposition of dust aerosols in East Asia and the characteristics of regional transport are discussed. The results show that the sand source in China is mainly located in Taklimakan Desert, Hexi Corridor and Hetao area. The emission intensity was the largest in spring, gradually decreased in summer and autumn, and the weakest in winter, and the intensity decreased year by year. The average annual emission in the region was 581Tg / a. The simulated optical thickness of sand dust (AOD) is in good agreement with satellite observation. The AOD of Taklimakan desert is closely related to the sandstorm activity, and its occurrence time is the earliest and the duration is the longest. On the regional average, dry deposition and wet deposition can eliminate 77% and 22% of dust emissions respectively, among which dry deposition plays a leading role in the source area, far from the source region of the northeast and northwest Pacific Ocean, wet deposition is more important. Dust particles are moved out mainly by gravity dry deposition, while wet deposition contributes more than 60% to small particles. Gravity dry deposition plays a leading role throughout the year (especially in spring), and the effect of convective precipitation and wet deposition increases significantly in summer, and generally, the total rate of dust deposition decreases year by year. East Asian dust aerosols are transported from west to east through three conveyors, which can affect North, Central and South China of China. The study on divergence shows that the aerosol advection term has a great effect on aerosol divergence in the source area of sand dust, and dust emission has a significant effect on dust transport and AOD.The west side of Tarim Basin is caused by convergence and divergence term of wind field. It shows that topography and wind field are very important for dust transport and AOD in this area.
【作者單位】: 南京信息工程大學(xué)中國氣象局氣溶膠與云降水重點開放實驗室;江蘇省氣候中心;南京信息工程大學(xué)氣象災(zāi)害預(yù)報預(yù)警與評估協(xié)同創(chuàng)新中心;中國氣象局廣州熱帶海洋氣象研究所;
【基金】:國家自然科學(xué)基金資助項目(91337101,41590873,41505052)
【分類號】:X513
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