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Effect of Aerosols on the Ice Cloud Properties Over the Tibetan Plateau

机译:气溶胶对青藏高原冰云性质的影响

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摘要

With the highlight of environmental problems over the Tibetan Plateau (TP), aerosol pollution and the influence of this pollution on cloud properties are becoming a new area of research. Based on the aerosol index and cloud property parameters derived from satellite observations, in this study, the inconsistent effects of aerosols on ice cloud properties between daytime and nighttime over the TP are investigated. The results indicate that ice clouds are mainly distributed over the TP margin area, especially over the north slope, during both daytime and nighttime. The occurrence frequency of ice cloud is higher during the daytime than during the nighttime over the margin areas of the TP. Similarly, aerosols are mainly concentrated over the northern margin of the TP. A potential relationship may exist between the aerosol index and ice cloud properties. When the aerosol index increases from 0.05 to 0.17, the ice cloud droplet radius (ICDR) during the daytime decreases from 32.1 to 27.9 mu m, while the ICDR during the nighttime remains almost constant (approximately 25 mu m); furthermore, the ice water path (IWP) during the daytime decreases slightly due to the saturation effect, while the nocturnal IWP increases significantly. The changes in ice cloud optical depth (ICOD) during daytime and nighttime show significant and completely opposite trends. The removal of the influence of meteorological factors showed that aerosols have a more dominant influence than meteorological conditions on ice cloud properties (except for the nocturnal ICDR and IWP during the daytime).
机译:随着青藏高原环境问题的突出,气溶胶污染及其对云特性的影响正在成为一个新的研究领域。本文基于卫星观测得出的气溶胶指数和云属性参数,研究了青藏高原上空昼夜气溶胶对冰云性质的不一致影响。结果表明:白天和夜间冰云主要分布在青藏高原边缘地区,尤其是北坡地区。青藏高原边缘地区白天冰云的出现频率高于夜间。同样,气溶胶主要集中在青藏高原的北缘。气溶胶指数和冰云特性之间可能存在潜在的关系。当气溶胶指数从0.05增加到0.17时,白天的冰滴半径(ICDR)从32.1μm减小到27.9μm,而夜间的ICDR几乎保持不变(约25μm);此外,由于饱和效应,白天的冰水路径(IWP)略有下降,而夜间的IWP显著增加。白天和夜间冰云光学深度(ICOD)的变化呈现出显著且完全相反的趋势。去除气象因素的影响表明,气溶胶对冰云性质的影响比气象条件更主要(夜间ICDR和IWP在白天除外)。

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