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| 天津武清地区云凝结核变化特征 | |
| 引用本文： | 王婷婷,孙俊英,沈小静,邓兆泽,张养梅,安林昌,张晓春,颜鹏,梁文德,陈丽丽.天津武清地区云凝结核变化特征[J].气象科技,2012,40(3):466-473. |
| 作者姓名： | 王婷婷 孙俊英 沈小静 邓兆泽 张养梅 安林昌 张晓春 颜鹏 梁文德 陈丽丽 |
| 作者单位： | 1. 中国气象科学研究院,中国气象局大气化学重点开放实验室,北京100081 2. 北京大学物理学院,北京,100871 3. 天津武清区气象局,天津,301700 |
| 基金项目： | 国家重点基础研究发展计划（2011CB403401）、国家科技部国际合作研究项目（2009DFA22800）资助 |
| 摘 要： | 利用2009年11—12月在天津武清气象局测量的云凝结核(CCN:Cloud Condensation Nuclei)浓度资料以及气溶胶数谱分布的观测资料,分析了武清地区在不同过饱和度(0.1%～1.0%)下云凝结核浓度及活化率的变化特征。结果表明:武清地区冬季CCN数浓度变化范围很大,过饱和度1%时,浓度变化范围为4000～32000cm-3,且浓度受风速影响明显,风速2级以下CCN数浓度很高,过饱和度1%时,其平均浓度可达16000cm-3,但对于4级风速以上CCN平均浓度为4000cm-3左右;在过饱和度0.1%～0.4%间CCN浓度变化较大,过饱和度每增加0.1%,CCN浓度增加值平均约为过饱和度0.4%～1.0%间浓度增量的5倍。低过饱和度(0.1%、0.2%)下,活化率受风速影响明显,1级风速下的CCN活化率约为4级风速下的3倍,但在过饱和度1%时活化率则相差不大。CCN浓度的日变化呈双峰型,峰值时刻为北京时间08:00和18:00左右,活化率的日变化则呈双谷型,这主要是受局地排放影响的结果。利用指数函数拟合各风速下CCN浓度过饱和度谱,表明该地谱型为典型的大陆型。 |
| 关 键 词： | 云凝结核 活化率 数谱分布日变化 |
| 收稿时间： | 2010/10/9 0:00:00 |
| 修稿时间： | 2011/2/24 0:00:00 |
Variation Characteristics of Cloud Condensation Nuclei at Wuqing |
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| Wang Tingting,Sun Junying,Shen Xiaojing,Deng Zhaoze,Zhang Yangmei,An Linchang,Zhang Xiaochun,Yan Peng,Liang Wende and Chen Lili.Variation Characteristics of Cloud Condensation Nuclei at Wuqing[J].Meteorological Science and Technology,2012,40(3):466-473. | |
| Authors: | Wang Tingting Sun Junying Shen Xiaojing Deng Zhaoze Zhang Yangmei An Linchang Zhang Xiaochun Yan Peng Liang Wende and Chen Lili |
| Institution: | Wang Tingting Sun Junying Shen Xiaojing Deng Zhaoze Zhang Yangmei An Linchang Zhang Xiaochun Yan Peng Liang Wende Chen Lili (1 Key Laboratory of Atmospheric Chemistry of China Meteorological Service, Chinese Academy of Meteorological Sciences, Beijing 100081 ; 2 School of Physics, Peking University, Beijing 100871 ; 3 Wuqing Meteorological Service, Tianjin 301700) |
| Abstract: | Based on the cloud condensation nuclei （CCN） concentration and aerosol size distribution measured at the Wuqing Meteorological Service of Tianjin from November to December of 2009, the variation characteristics of CCN concentrations and activation rates at different degrees of supersaturation （0.1% to 1.0%） are analyzed. The results show that the CCN concentration varies in the range of 4000 to 32000 cm-3 in the supersaturation of 1% and is affected by the wind speed significantly at Wuqing in winter. Under the wind speed of 1.5 to 3.3 m/s, the CCN concentration is very high, can reach 16000 cm-3 at 1% supersaturation, but is just one forth of that under the wind speed of 3.5 to 5.5 m/s. The CCN concentration varies greatly in the range of 0.1% to 0.4% supersaturation. The increase of CCN concentration for every 0.1% supersaturation in the range of 0.1 to 0.4% is about 5 times of those in the range of 0.4% to 1.0% supersaturation. The activation rate is affected significantly by the wind speed at the low supersaturation （0.1%, 0.2 %）, and the value under the wind speed smaller than 1.5 m. s 1 is about three times of that under the wind speed larger than 5.5 m/s, but at the supersaturation of 1%, the activation rate difference with wind speed is little. The diurnal variation of CCN concentration shows two peaks at 08：00 and 18：00, as there are two valleys in the diurnal variation of the activation rate, which suggests the effects from the local emissions. The power law fitting for the relationship of CCN concentration and supersaturation under different wind speeds shows that the supersaturation spectrum of CCN at Wuqing belongs to the continental style. |
| Keywords: | cloud condensation nuclei activation rate particle number size distribution diurnal variation |
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