【摘要】 本文利用定时激光探测资料,分析了华北秋季晴天低层大气分层光学厚度的一些特征,并对大气光学厚度的计算方法和误差因素进行了讨论.初步分析结果表明:(1)低层大气光学厚度与气团属性有很密切的关系;(2)在白天,随对流发展、气溶胶由下向上输送的高度可超过3公里,最大输送在2公里以下;(3)消光系数的垂直结构具有明显的日变化;(4)光学厚度与地面水平能见度不呈简单的对应关系.更多还原

【Abstract】 In this paper, some characteristics of layered optical depth in the lower atmosphere in North China during fine days of autumn are analysed by using routine lidar-measur-ed data. The calculating method and errors of atmospheric extinction coefficient are also discussed. The following results are obtained: (1) The optical depth in the lower atmosphere is close relevant to the properties of surrounding air mass. (2) In the daytime, the upward transport height of aerosols from the ground increases with convection development and may be higher than 3 km with maximum transport being below 2 km. (3) The profile of extinction coefficient has an obvious diurnal variation. (4) There is no simple one-to-one correspondence between optical depth and surface horizontal visibility.更多还原