河北地区秋季气溶胶飞机探测资料分析

An observational study of the aerosol distributions over Hebei area during autumn

利用河北省2005—2007年秋季不同天气(晴、有云、雾、降水)条件下气溶胶飞机观测资料和宏观天气资料,综合分析了河北地区不同天气、不同高度、不同城市大气气溶胶的分布特征。分析结果表明:2006—2007年探测的气溶胶小粒子平均直径均在0.180μm以上,比2005年秋季的粒子尺度大0.05μm左右。非降水天气下近地面高浓度值一般发生在风速较小、湿度较小、有逆温或是有轻雾和霾存在的情况下。增雨作业时气溶胶数浓度与地面大气状况及降水量的大小有关,降水对气溶胶粒子的清除较为明显。气溶胶粒子谱除在降水天气下呈双峰分布外,晴天、多云、阴天天气下呈单峰分布。石家庄和邯郸的气溶胶污染较为严重,海岛上空浓度最低,陆地上空的气溶胶比海洋上空高一个量级。

Using PMS data obtained in Hebei province during the autumn from 2005 to 2007, combined with weather data, the aerosol particles were analyzed in different weathers and height as well as cities. The results show that the average diameter of fine particles was 0. 180 μm in 2006-2007, it was0. 05 μm bigger than the size in 2005. The high number concentration near surface always occurred under the conditions of weak wind speeds, low humidity, presence of inversion or mist and haze. The number of aerosol concentration was connected with the ground atmospheric conditions and the rainfall amount in ar- tificial rainfall, and the removal of aerosol particles was obvious. The aerosol distribution in precipitation weather followed bimodal distribution; in sunny and cloudy weather, the size distribution followed uni- modal distribution. The aerosol pollution was very heavy in Handan and Shijiazhuang. Over the sea （ Ca- ofeidian）, the aerosol particles concentration was lower than on land over an order of magnitude.