【摘要】：基于CALIOP/CALIPSO氣溶膠廓線及類型產(chǎn)品,并綜合AERONET產(chǎn)品、地面常規(guī)及探空資料和HYSPLIT后向軌跡模式,分析了華北地區(qū)2013年12月22-25日一次霾過程中氣溶膠垂直分布特征及其成因。結(jié)果表明:低層存在均勻混合氣溶膠消光層,層高及平均氣溶膠消光系數(shù)(σ)霾日為0.481 km與0.766 km~(-1),無霾日為0.181 km與0.375 km~(-1),消光層之上σ呈指數(shù)衰減;500 m以下氣溶膠光學(xué)厚度(AOD)對總AOD貢獻(xiàn)霾日為47%,無霾日為36%;1 km以下,霾日體積退偏振比(VDR)與色比(CR)分別介于5%~15%與0.4~0.8,無霾日為15%~35%與0.6~1.0,霾日VDR與CR均值分別為13.883%與0.518,無霾日為26.371%與0.853。污染沙塵和煙塵為此次霾過程的主要?dú)馊苣z類型,本地排放及周邊區(qū)域輸送是此次霾過程中氣溶膠的主要來源。小氣壓梯度、弱風(fēng)速、高相對濕度及持續(xù)逆溫層是導(dǎo)致此次霾事件的主要天氣原因。
[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，

本文編號：2500911