新疆干旱区气溶胶间接效应区域性分析

发布时间：2018-08-19 13:26

【摘要】：利用MODIS气溶胶和云资料以及实测的降水数据,可从宏观角度分析新疆区域气溶胶时空分布特征,研究气溶胶与云和降水之间的相互影响关系.结果表明:近十年来受区域暖-干趋势的转变影响,新疆地区气溶胶光学厚度空间分布呈现显著的区域性和季节性差异;南疆地区气溶胶光学厚度整体高于北疆地区,春、夏高,秋、冬低,整体呈现增加趋势,其中,北疆地区气溶胶光学厚度变化程度相对较为显著;受气候变化和颗粒粒径差异影响,新疆干旱区云光学厚度与气溶胶光学厚度呈负相关变化趋势,相关系数北疆地区高于南疆地区;云水路径受温度、湿度影响较大,对气溶胶光学厚度的变化的敏感程度北疆大于南疆,夏季最高,冬季最低;气溶胶光学厚度与云滴粒子有效半径关系复杂,受水汽影响较大,在云层含水量较低的情况下,云滴粒子有效半径与气溶胶光学厚度呈负相关,说明在干燥地区或季节,气溶胶的增加,抑制云滴粒子的增长;整体来看,新疆干旱区气溶胶的增加抑制了区域降水的形成.
[Abstract]:Using MODIS aerosol and cloud data and the measured precipitation data, the spatial and temporal distribution characteristics of aerosols in Xinjiang can be analyzed from a macro point of view, and the interaction between aerosol and cloud and precipitation can be studied. The results show that the spatial distribution of aerosol optical thickness in Xinjiang shows significant regional and seasonal differences due to the change of regional warm-dry trend in recent ten years, the aerosol optical thickness in southern Xinjiang is higher than that in northern Xinjiang, and the spatial distribution of aerosol optical thickness in Xinjiang is higher than that in northern Xinjiang in spring. Summer height, autumn, winter low, the whole presents the increase trend, among them, the north Xinjiang area aerosol optical thickness change degree is relatively obvious, is affected by the climate change and the particle size difference, There is a negative correlation between cloud optical thickness and aerosol optical thickness in arid region of Xinjiang, the correlation coefficient is higher in northern Xinjiang than in southern Xinjiang, the cloud water path is influenced by temperature and humidity. The sensitivity to the variation of aerosol optical thickness in northern Xinjiang is greater than that in southern Xinjiang, and is highest in summer and lowest in winter. The relationship between aerosol optical thickness and the effective radius of cloud droplets is complex, which is greatly affected by water vapor, and when the cloud water content is low, the relationship between aerosol optical thickness and the effective radius of cloud droplets is complex. There is a negative correlation between the effective radius of cloud droplets and the optical thickness of aerosols, which indicates that the increase of aerosols in dry areas or seasons inhibits the growth of cloud droplets, and on the whole, the increase of aerosols in arid areas of Xinjiang inhibits the formation of regional precipitation.
【作者单位】：新疆大学资源与环境科学学院;绿洲生态教育部重点实验室;新疆交通职业技术学院;
【基金】：国家自然科学基金项目(41130531;U1303381;41261090;41161063) 新疆大学优秀博士研究生创新项目(XJUBSCX-2014012)
【分类号】：X513

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