石家庄地区气溶胶和CCN垂直廓线的飞机观测分析
投稿时间: 2017-03-18  最后修改时间: 2017-05-31  点此下载全文
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作者单位E-mail
沙桐 南京信息工程大学 582016892@qq.com 
马晓燕 南京信息工程大学 xma@nuist.edu.cn 
银燕 南京信息工程大学  
李军霞 山西省气象局人工影响天气办  
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)(40475005);江苏省六大人才高峰计划(2014JY019);南京信息工程大学人才启动费
中文摘要:利用2010年春夏之交石家庄地区11架次的气溶胶和云凝结核(CCN)飞机同步观测资料,对比分析该地区云天和晴天气溶胶粒子的垂直廓线、不同高度气溶胶数谱特征,以及CCN的垂直分布、活化特性等。结果表明:云天气溶胶数浓度均值为1553.28cm-3,有效直径均值为0.52祄,比晴天数浓度(883.82cm-3)大76%,有效直径(0.37祄)大41%。云天气溶胶数浓度呈指数型递减分布,有效半径在2500m以下随高度变化不明显,2500m以上随高度逐渐增大。晴天气溶胶数浓度在800-1500m内有累积,有效半径随高度没有明显的变化趋势。不同高度上气溶胶谱型基本一致,云天和晴天在气溶胶小尺度端(<0.3祄)谱分布是连续的,在0.3祄处数谱均明显下降。云天和晴天CCN数浓度均随高度增大而减小,且各个高度层上云天CCN数浓度均大于晴天。云天CCN活化比率随高度变化不明显,晴天CCN活化比率随高度增大。气溶胶粒子尺度与CCN活化比率之间呈线性正相关。
中文关键词:石家庄地区 飞机观测 气溶胶 云凝结核(CCN) 垂直廓线
 
Aircraft measurements and analysis of the vertical distribution of aerosol particles and CCN over Shijiazhuang area
Abstract:In-situ aircraft measurements of aerosols and CCN of 11 flights during the spring and summer of 2010 were analyzed in Shijiazhuang area, including the comparison of the vertical distribution of aerosol particles, particle size distribution at different heights, as well as the vertical distribution and activation characteristics of CCN under cloudy and clear conditions. The results show that the mean aerosol number concentration (Na) under cloudy conditions is 1553.28cm-3, the mean effective diameter (De) is 0.52μm, which is 76% larger than that of clear sky (Na: 883.82cm-3) and 41% for effective diameter (De: 0.37μm). Under cloudy conditions, Na decreases exponentially with height, and the particle effective radius (Re) does not change obviously with height below 2500m, but it increases gradually with height above 2500m. Under clear sky, Na accumulates in the height range from 800 to 1500m,and Re does not change significantly with height. The shape of aerosol number size distributions are almost same at different heights, and it has a successive distribution for smaller particles (<0.3祄) both on cloudy and clear sky, and a sharp decrease at 0.3祄. Both on cloudy and clear sky, the number concentration of CCN (NCCN) decreases with altitude in each observation height, moreover it is higher on cloudy than clear sky. The activation ratio of CCN (NCCN/NCN) does not change significantly with height under cloudy conditions, however it increases with altitude on clear sky. Particle size andNCCN/NCN is positively linear correlation.
keywords:Shijiazhuang area, aircraft measurements, aerosol, CCN, vertical distribution
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