AEDAL在青岛、渤海及黄海探测的定标反演

Inversion Results of the Atmospheric Environment Detecting Airborne Lidar in Qingdao,Bohai and Yellow Sea Area

在不进行大气参数假设和加载其他辅助设备的情况下,通过对AEDAL机载大气环境探测激光雷达探测数据的分析,证明了用Slope法对空基激光雷达进行定标反演的可行性。AEDAL的定标反演结果,生动地展现了青岛地区及渤海、黄海海域气溶胶垂直分布、边界层结构及边界层光学厚度的重要特征。首先,冷锋过境,边界层高度明显下降的同时,气溶胶出现多层分布的现象,海区气溶胶垂直分布较陆地有明显的沉降现象。其次,青岛地区整个边界层光学厚度表现为城区最大、丘陵地区最小、渤海海区介于两者之间的分布特点,海区边界层光学厚度变化相对平缓,迎风坡附近的边界层光学厚度较周围有所增大。青岛至渤海这一区域,晴朗天气下边界层光学厚度的大小介于0.15～0.35之间,雾天则在0.3～0.45之间,而黄海海域则可达到0.55左右。这说明,青岛地区边界层气溶胶主要来自于城市和海洋,在冬季季风对气溶胶分布起作用的同时,山脉及地面风场对边界层气溶胶的输送有重要影响。

Without the hypothesis of atmospheric parameters and auxiliary equipment, it is proven the slope method is capable of deriving extinction coefficients profiles and atmosphere optical depth through the analysis of the atmospheric environment detecting airborne lidar （AEDAL） data collected during November 7 to 11, 2005. The spatial and temporal variations of the planet boundary layer （PBL）, aerosol optical depth （AOD） of the PBL and aerosol distribution along flight lines are exhibited from the AEDAL inversion results. Firstly, the sinking of aerosol was found in Yellow Sea area, moreover, the PBL altitude also dropped while the multi-layer aerosol presented after a cold front passagel secondly, the AOD of the PBL is the highest over Qingdao cit- y, the lowest over foothill area and in between them over sea area, Meanwhile, it is relatively stable over sea area but slightly in- creases nearby upslope. The AOD values of the PBL were determined to be 0. 15-0. 35 in clear day and 0. 3-0. 45 in foggy day o- ver the area from Qingdao to Bohai, but they are higher and reach around 0. 55 in Yellow Sea area. It is evidenced that the aero- sol in the PBL mainly comes from city and also is contributed by salt sea over Qingdao area, and ridge and surface wind play an important role in the aerosol transport while the monsoon affects the aerosol distribution.