摘要
为评估气溶胶的直接和间接辐射强迫,利用CALIPSO卫星2级产品,分析了中国气溶胶光学厚度(AOD)的季节空间分布、季节光学属性及其垂直分布特征,结合AERONET观测数据,对气溶胶的季节光学属性进行了验证.结果表明,塔克拉玛干沙漠和青藏高原的退偏振比(PDR)和色比(CR)值最大,东北平原、四川盆地、华北平原和长江三角洲的PDR和CR值最小,黄土高原的PDR和CR值居中,珠江三角洲的PDR值与污染地区一样大,CR值较高.春季沙尘被传输至对流层中部及以上,夏季强烈的垂直对流活动使大量气溶胶被从边界层内带至自由对流层;秋冬季稳定的气象条件使大量气溶胶滞留在边界层内,冬季地面1.5 km内AOD与总AOD的比值及消光递减率均达到了最大值48.25%和0.13 km-2,污染严重的地区在边界层内的消光递减率比污染程度轻的地区大.
To assess the direct and indirect aerosol radiative forcing,the spatial distribution of seasonal aerosol optical depth(AOD),seasonal aerosol optical properties,and seasonal aerosol vertical distribution characteristics were analyzed over China by using Level 2 products from CALIPSO satellite.The seasonal aerosol optical properties were validated by the AERONET observation data.The results showed that the Taklimakan Desert and Tibet Plateau had the greatest depolarization and color ratios while the Northeast Plain,Sichuan Basin,North China Plain and Changjiang River Delta had the smallest depolarization and color ratios.The results also showed that the Loess Plateau had intermediate depolarization and color ratios,while the Zhujiang River Delta had the same depolarization ratio and greater color ratio compared with the polluted regions.The dust in spring was transported to the middle and upper troposphere.The strong vertical convection activities in summer transported massive aerosols from the atmospheric boundary layer to the free troposphere.The stable meteorological conditions in autumn and winter trapped massive aerosols within the boundary layer.The ratio of the AOD within 1.5 km above the ground to the total AOD and the extinction lapse rate in winter were greater than those in other seasons,being 48.25%and 0.13 km-2,respectively.The extinction lapse rates in the planetary boundary layer for the heavily polluted regions were greater than those in the lightly polluted regions.
作者
高星星
陈艳
张镭
张武
Gao Xing-xing;ChenYan;Zhang Lei;Zhang Wu(Key Laboratory of Serai-Arid Climate Changes with the Ministry of Education,College of Atmospheric Sciences,Lanzhou University,Lanzhou 730000,China;Shaanxi Meteorological Observatory,Xi'an 710015,China)
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
2018年第4期431-439,共9页
Journal of Lanzhou University(Natural Sciences)
基金
国家自然科学基金重点项目(41430425)
中央高校基本科研业务费专项资金项目(LZUJBKY-2017-62).
作者简介
通信联系人:陈艳(1982-),女,内蒙古阿拉善人,工程师,硕士,e-mail:chenyan@lzu.edu.cn,研究方向为大气辐射与遥感。
