一次强沙尘输送过程中气溶胶垂直分布特征研究

采用CALIPSO卫星的星载激光雷达资料,分析了2007年3月28日~4月2日由西向东途经新疆、青海、甘肃、内蒙古、宁夏、陕西、山西、河北、北京、山东、江苏、上海、台湾等省、市、自治区的一次远程强沙尘污染传输过程,对后向散射系数、退偏比、色比等光学特性参数进行了研究.结果表明,这次过程中,较大的沙尘颗粒大多出现在近地面附近,而相对小的沙尘颗粒在对流层中高层垂直剖面上分布比较均匀.CALIPSO卫星资料能够较好地反映强沙尘远程传输过程中沙尘气溶胶光学特性的垂直分布特征及其粒子大小、不规则性随高度的变化特征.

Vertical distribution characteristics of aerosol during a long-distance transport of heavy dust pollution

A case of long-distance transport of heavy dust pollution from west to east passing through Xinjiang, Qinghai, Gansu, Inner Mongolia, Ningxia, Shaanxi, Shanxi, Hebei, Beijing, Shandong, Jiangsu, Shanghai and Taiwan during March 28-April 2, 2007 was analyzed by using the lidar data onboard CALIPSO satellite. The optical parameters including back scattering coefficient, depolarization ratio, and color ratio were studied. Most large dust particles were near surface while relatively small ones stayed at middle and high altitude and had an even distribution. The lidar data from CALIPSO could reflect the vertical distributions of optical properties of dust aerosols as well as the features of particle size and irregularity varying with altitude during long-distance transport of heavy dust pollution.