中亞沙塵氣溶膠時空分布特征及潛在擴散特性分析
[Abstract]:Central Asia is located in arid and semi-arid climate zones. The aerosol optical thickness (Aerosol Optical Depth,) in Central Asia from 2002 to 2015 was analyzed from a macro perspective by using the medium Resolution Imaging Spectrometer (Moderate-resolution Imaging Spectrometer,MODIS) and cloud-aerosol polarization radar (CloudAerosol Lidar with Orthogonal Polarization,CALIOP) remote sensing data. The temporal and spatial distribution characteristics of AOD) and the vertical distribution characteristics of dust aerosol optical properties were analyzed. The seasonal variation of dust transport was discussed by using Lagrange mixed diffusion model (Hybrid Single Particle Lagrangian Integrated Trajectory,HYSPLIT). The results showed that: (1) the spatial distribution of AOD in Central Asia showed significant seasonal difference, and the mean of spring (0.412), summer (0.258), winter (0.167) and autumn (0.159) showed an increasing trend in 14 years; (2) the high value region of AOD in Central Asia is mainly concentrated in the Aral Sea region and the Tarim Basin in Xinjiang. Among them, the annual average value of AOD in the Aral Sea region is 0.278, and the average annual increase is 3.175%. It is mainly affected by the enlarged exposed area of the dry lake bottom caused by the degradation of the Aral Sea. The annual average value of AOD in Taklimakan desert is 0.421, with an average annual increase of 0.062, which is mainly affected by temperature and wind speed, and the dominant factors are slightly different in different seasons. (3) the aerosol concentration in the dust source region is mainly within the range of 0 ~ 2 km near the ground, and the depolarization ratio of aerosols over the desert (10 ~ 45%) is slightly larger than that over the Aral Sea (15 ~ 30%); The color ratio in the Aral Sea region (0.30.80) is smaller than that in the desert area (0.50.90), and there are two high-frequency color ratios of 0.5 and 0.3 at 0 ~ 2 km and 4 ~ 6 km, respectively, indicating that there is a comparison between the dust aerosol and the sand aerosol. The salt dust aerosols in the Aral Sea area have higher spherical degree, smaller particles and higher height of dispersion. (4) the potential diffusion direction of salt dust in Aral Sea area is mainly northeast, southwest and south, and the distance to northeast is the furthest, and the influence range can reach to the central part of Russia, the height and distance of southwest diffusion path is close. It mainly affects Uzbekistan and Turkmenistan, but the occurrence ratio is relatively high. After dust rising in Taklimakan desert, most of the dust particles are still deposited near the dust source area and spread to the east of the dust aerosol. Mainly affects China's Qinghai, Gansu, Ningxia, Shaanxi and other regions.
【作者單位】: 新疆大學(xué)資源與環(huán)境科學(xué)學(xué)院;綠洲生態(tài)教育部重點實驗室;新疆交通職業(yè)技術(shù)學(xué)院;
【分類號】:X513
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