基于激光云高仪的北京沙尘气溶胶特征分析

发布时间：2018-08-17 19:29

【摘要】：利用激光云高仪对2015年春天北京沙尘天气过程进行连续观测,结合常规地面气象要素、能见度和PM_(10)颗粒物质量浓度变化分析了两次沙尘天气过程中浮尘、扬沙和沙尘暴三类天气现象时气溶胶后向散射系数的时空分布特征,分析了云高仪后向散射系数与PM_(10)颗粒物质量浓度的相关性。结果表明:激光云高仪能够监测沙尘气溶胶粒子的时空变化,扬沙和沙尘暴期间后向散射系数随高度的增加而减小,后向散射系数在0.005 km~(-1)·srad~(-1)以上的沙尘层厚度约500 m;云高仪的近地面大气后向散射系数变化趋势与PM_(10)颗粒物浓度变化相同,10、50和100 m高度上的后向散射系数与PM_(10)颗粒物质量浓度的相关系数均在0.82以上。
[Abstract]:The continuous observation of the dust weather process in Beijing in spring 2015 was carried out by using the laser cloud height instrument. Combined with the conventional surface meteorological elements, the variation of visibility and the mass concentration of PM10 particles, the dust floatation during the two dust weather events was analyzed. The spatial and temporal distribution characteristics of aerosol backscattering coefficient under three weather phenomena of sand and sandstorm are analyzed. The correlation between the backscatter coefficient of cloud height and the mass concentration of PM10 particles is analyzed. The results show that the laser height meter can monitor the temporal and spatial variation of dust aerosol particles, and the backscattering coefficient decreases with the increase of height during sand and sandstorm. The thickness of dust layer with backscattering coefficient above 0.005 km ~ (-1) srad~ (-1) is about 500m, and the variation trend of backscattering coefficient is the same as that of PM _ (10) particle concentration at the height of 1050m and 100m. The correlation coefficient of volume concentration is above 0.82.
【作者单位】：中国气象局气象探测中心;南京信息工程大学大气物理学院;
【基金】：江苏省基础研究计划(BK20141480) 中国气象局气象关键技术与集成项目(CMAGJ2015M79)和中国气象局气象探测中心青年基金项目“基于多种观测手段的视程障碍算法改进研究”共同资助
【分类号】：P407;P425.55;X513

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