结合激光雷达分析上海地区一次连续浮尘天气过程

通过分析2010年3月至20日至3月22日上海地区一次典型的连续浮尘天气过程,利用激光雷达数据资料反演得到的气溶胶消光系数图和垂直廓线图,结合地面气象数据和气溶胶观测资料以及卫星遥感资料,初步得出了此次连续浮尘天气形成的原因。外源性输入和垂直风场分布是导致此次浮尘天气发生的重要原因,大气层结变化决定着浮尘天气发生的强度,当存在接地逆温时,浮尘天气维持,而太阳辐射强度变化决定着边界层高度的变化。第一次浮尘过程以大颗粒污染为主,且在消光作用中散射性气溶胶的贡献大于吸收性气溶胶,而第二次回流浮尘过程则PM2.5比重上升,吸收性气溶胶对消光系数的贡献与散射性气溶胶大体相当。

Analysis of a dust case using lidar in Shanghai

The dust case was analyzed by using aerosol extinction coefficient sequence chart retrieved by lidar observation data and meteorological observation data. The key factor of these two dust cases occurred was the dust transferred from North China, and the key reason of those two dust cases maintain so long was exogenous input and the vertical wind. The atmospheric profile affected the intensity of dust case. The dust case was holding when the temperature inversion occurred at the ground. The solar radiation affected the height of boundary layer. The main particulate matter is big size particle in the first dust case, and the aerosol scattering coefficient was higher than the aerosol absorption coefficient. The proportion of PM2.5 rose in the reflux dust case, and the aerosol scattering coefficient corresponded to the aerosol absorption coefficient.