基于CloudSat/CALIPSO卫星的南京地区冰云物理特性分析

Analysis of ice cloud physical characteristics based on CloudSat/CALIPSO data in Nanjing area

该文根据CloudSat卫星搭载的毫米波雷达(CPR)和CALIPSO卫星搭载的激光雷达(CALIOP)联合探测反演2007—2010年南京地区的冰云物理特性,并通过毫米波雷达和激光雷达的对比分析,结果表明:冰云变化趋势随年份先增加后减少,且春夏季发生概率均大于秋冬季;云底高度主要分布在7~8 km之间,云顶高度主要分布在8~12 km之间,云底和云顶高度的最大平均值均出现在2009年,分别为10.07 km、11.69 km,平均值均随年份呈先减后增再减的趋势;冰云冰水含量值主要分布在0~0.0050 g/m^3内,其值大小与出现的概率呈负相关,平均值随年份呈先增后减再增的趋势;粒子有效半径主要集中在20.0~50.0μm内,均值随年份呈逐渐递减的趋势。

Based on the combined detection of millimeter-wave radar(CPR)carried by CloudSat and laser radar(CALIOP)carried by CALIPSO,the physical characteristics of ice cloud in Nanjing from 2007 to 2010 were inverted,and they were compared with the detection results of millimeter-wave radar and lidar,the results shows:the trend of ice cloud changes with the increase of the first and then decreases,and the probability of occurrence in spring and summer is greater than that in autumn and winter.The height of the cloud-base is mainly distributed between 7~8 km.The height of the cloud-top is mainly distributed between 8~12 km.The maximum average values of cloud bottom and cloud top height appeared in 2009,which were 10.07 km and 11.69 km respectively.The average value decreased first,then increased and then decreased.The ice water content of ice cloud is mainly distributed in 0~0.0050 g/m^3,and its value is negatively correlated with the probability of occurrence.The average value increases first,then decreases and then increases.The effective radius of particles is mainly concentrated in 20.0~50.0μm,and the mean value gradually decreases with the year.