摘要
利用CALIPSO卫星提供的激光雷达数据分析了长三角地区云光学特性特征,可知,长三角地区主要云类型为碎积云、卷云、透光高积云、蔽光高积云和层积云,云平均消光系数在0.2~0.4之间,色比值范围在0.02~1.9之间,退偏比分布范围为0~0.9之间,液相云粒子形状更偏向于球型。对云光学参数随季节变化的分析表明,与春夏季相比,秋季10 km以上的云消光能力更强,秋冬季节5 km以下的云色比值更大,但与其他季节相比,夏季对流活动活跃,8 km以下的云粒子退偏比和色比值分布更加均匀。
Using lidar data provided by the CALIPSO satellite,clouds’optical characteristics in the Yangtze River Delta are analysed.It is known that the main cloud types in the Yangtze River Delta are cumulus,cirrus,transparent altocumulus,obscured altocumulus and stratocumulus.The average extinction coefficient of clouds is between 0.2 and0.4,the colour ratio is between 0.02 and 1.9,and the distribution range of the depolarisation ratio is 0-0.9 In the ball type.The analysis of the seasonal variation of cloud optical parameters shows that compared with spring and summer,the cloud extinction capacity of more than 10 km in autumn is more robust,and the cloud colour ratio below 5 km in autumn and winter is larger.However,the convective activity is active in summer,and the depolarisation ratio and colour ratio distribution of cloud particles below 8 km is more uniform than other seasons.
作者
赵忆睿
范广强
曹念文
沈吉
贾鹏程
ZHAO Yirui;FAN Guangqiang;CAO Nianwen;SHEN Ji;JIA Pengcheng(Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science and Technology,Nanjing 210044,China;Key Laboratory of Environmental Optics and Technology,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Hefei 230031,China)
出处
《激光杂志》
CAS
北大核心
2021年第4期9-15,共7页
Laser Journal
基金
国家重点研发计划项目(No.2018YFC0213100
2017YFC0209600)。
关键词
大气光学
云
CALIPSO
消光系数
退偏比
色比
atmospheric optics
cloud
CALIPSO
extinction coefficient
depolarization ratio
color ratio