华北地区一次霾过程中气溶胶垂直分布特征研究

发布时间：2019-06-17 10:09

【摘要】：基于CALIOP/CALIPSO气溶胶廓线及类型产品,并综合AERONET产品、地面常规及探空资料和HYSPLIT后向轨迹模式,分析了华北地区2013年12月22-25日一次霾过程中气溶胶垂直分布特征及其成因。结果表明:低层存在均匀混合气溶胶消光层,层高及平均气溶胶消光系数(σ)霾日为0.481 km与0.766 km~(-1),无霾日为0.181 km与0.375 km~(-1),消光层之上σ呈指数衰减;500 m以下气溶胶光学厚度(AOD)对总AOD贡献霾日为47%,无霾日为36%;1 km以下,霾日体积退偏振比(VDR)与色比(CR)分别介于5%~15%与0.4~0.8,无霾日为15%~35%与0.6~1.0,霾日VDR与CR均值分别为13.883%与0.518,无霾日为26.371%与0.853。污染沙尘和烟尘为此次霾过程的主要气溶胶类型,本地排放及周边区域输送是此次霾过程中气溶胶的主要来源。小气压梯度、弱风速、高相对湿度及持续逆温层是导致此次霾事件的主要天气原因。
[Abstract]:Based on CALIOP/CALIPSO aerosol profile and type products, combined with AERONET products, surface routine and sounding data and HYSPLIT backward trajectory model, the vertical distribution characteristics and causes of aerosols in a haze process in North China from December 22 to 25, 2013 are analyzed. The results show that there is a uniform mixed aerosol extinction layer in the lower layer, the haze days of layer height and average aerosol extinction coefficient are 0.481 km and 0.766 km~ (- 1), the haze days without haze are 0.181 km and 0.375 km~ (- 1), the above extinction layer is exponential attenuation, the contribution of (AOD) to total AOD is 47%, and the haze free day is 36%. Below 1 km, the daily volume depolarization ratio (VDR) and color ratio (CR) are 5% 鈮，

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