Observational Analyses on Cloud Condensation Nuclei in Northwestern China in Summer of 2007
Observational Analyses on Cloud Condensation Nuclei in Northwestern China in Summer of 2007
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发表时间：
2010
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通讯作者：
Niu Sheng-jie
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作者：
Niu Sheng-jie
利用DMT（Droplet Measurement Technologies）连续流对流热梯度对流凝结核计数器对2007年夏季我国西北地区的云凝结核进行了观测，并对观测结果进行了对比分析。认为云凝结核的主要来源是地表。对流层低层CCN浓度最高，且随高度增加，CCN浓度逐渐降低。银川市污染城区与惠农市普通城区垂直观测对比表明，银川市污染城区CCN浓度高于惠农市普通城区，且浓度变化无显著差异。本文对石家庄夏季云凝结核的观测结果进行了统计分析，结果表明，在同一过饱和度（S）下，云凝结核的浓度有明显的差异。根据N=CSk的表达式，可以得到云凝结核的谱，拟合出谱参数C（2200）和k拟合的光谱参数C（2200）和k（0.77）反映了银川地区云凝结核的大陆性特征，祁连山地区云凝结核的清洁大陆性特征。
Cloud condensation nuclei-(CCN) was observed by DMT (Droplet Measurement Technologies) continuous flow stream wise thermal gradient CCN counter-on the ground atmosphere-in northwestern China in the summer of 2007 that is contrast analyzed.-It is-suggested-that the main source of CCN is from ground surface.-The CCN particles are the most concentrated in the lower-level troposphere,-and the CCN concentration is decreased with height.The comparison of vertical observation between polluted city-areas in Yinchuan and common-areas in Huinong shows that the former′s CCN concentration-is higher than-the latter′s one,and there is no-difference-in the concentration change.The CCN had a distinctive diurnal cycle-which is related with human activities,meteorological factors and surface conditions.The statistical results of CCN measurements show the obvious difference in concentration at the same supersaturation ( S ) in Shijiazhuang summertime.According to the expression N=CSk ,the CCN spectra can be derived.The fitted spectra parameters C (2200) and k (about 0.7) show the continental characteristic of CCN in Yinchuan,and the fitted spectra parameters C (2200) and k (about 0.77) show the clean continental characteristic of CCN in Qilianshan.