基于离子配对法的黄山地区云凝结核闭合研究

为了对黄山地区云凝结核(Cloud Condensation Nuclei,CCN)进行闭合研究,2014年6月30日至7月28日在黄山光明顶对大气气溶胶理化性质和CCN数浓度进行观测,分析了气溶胶化学组分、谱分布以及CCN数浓度随时间变化的特征,通过κ-K?hler理论并使用离子配对法计算得到CCN数浓度与观测得到的...

Study on the closure of cloud condensation nuclei based onion pairing method at Huangshan Mountain

To conduct a closed study on cloud condensation nuclei( CCN) at Guangmingding,Huangshan Mountain,physical and chemical properties and CCN number concentration of atmospheric aerosols were observed from June 30 to July 28,2014. The temporal characteristics of chemical composition,spectral distribution,and CCN number concentration were analyzed. The CCN number concentration calculated by ion-pairing method based on κ-Kohler theory was compared with the observations. The results indicated that the calculated and measured CCN concentrations show close correlation and high accuracy. The results of low supersaturation CCN closure are better than those of the high supersaturation,the CCN number concentration is underestimated when the supersaturation is low and overestimated when that is high,which shows that the chemical composition data of aerosol is very important for the prediction of the CCN number concentration,and the use of this method can lead to the closure of CCN. Considering the influence of 40% Water Soluble Organic Carbon( WSOC) on the hygroscopicity of aerosol particles,CCN closure results are better at the lower supersaturation,but the effect is not significant,especially when the fitting results are relatively low,there is no effect under poor high supersaturation. Therefore,the watersoluble inorganic components in aerosol particles have an important effect on the activation of CCN,while the WSOC,which contains more content,complex chemical components,and uncertain hygroscopicity,has a limited effect on the activation of CCN,which is consistent with some studies that the influence of aerosol hygroscopicity is more important than that of organic components with complex characteristics.