2007年冬季大连市区气溶胶垂直剖面特征

Vertical section characteristics of aerosol in winter of 2007 over Dalian,Liaoning province

选用2007年1月8—30日期间8个无云日的激光雷达资料进行分析。基于Fernald方法反演得到气溶胶消光系数廓线,结合无线电探空资料分析了边界层内气溶胶时空分布,并将反演的激光雷达最低观测高度处(180 m)的气溶胶消光系数与地面PM10、能见度资料进行对比分析。结果表明:冬季大连市区气溶胶主要分布在2 km以下区域,早晨和夜间在0.5 km以下区域经常存在一个气溶胶层;气溶胶消光系数廓线与探空资料较吻合;反演激光雷达最低观测高度处(180 m)的气溶胶消光系数与地面的PM10浓度呈正相关,与能见度呈负相关,相关性较好。

Lidar data of 8 clear weather days selecting from January 8 to 30 in 2007 were analyzed in Dalian. Aerosol extinction coefficient profiles were retrieved based on Fernald method. The temporal-spatial distributions of aerosol in boundary layer were discussed in terms of the wireless sounding data. At the same time, aerosol extinction coefficient at 180 m height （the lowest observation height） was contrasted with PM10 and visibility on the ground. The results show that aerosol mainly distributes within the height of 2 km in winter over Dalian. There exists an aerosol layer within the height of 0.5 km in the morning and at night. Aerosol extinction coefficient profiles accord with the sounding data. Aerosol extinction coefficient at 180 m height is a positive relation with PM10 concentration on the ground, and it is negative with visibility.