利用三架飞机联合探测资料分析层积混合云催化物理效应
投稿时间: 2016-10-12  最后修改时间: 2016-10-12  点此下载全文
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作者单位E-mail
王元 南京信息工程大学 wangy2012@nuist.edu.cn 
基金项目:The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)
中文摘要:本文利用2009年4月18日三架飞机联合探测层积混合云资料,结合MICAPS再分析资料、雷达、卫星及地面台站资料等,在准确区分自然云区与催化响应区的基础上,对这次降水性层积混合云的微结构和催化物理响应进行了深入研究。结果表明:云顶部(4800m层)为云的主体,累积了云中大部分的过冷水;云顶部嵌入式积云区温度低于周围层云区2℃,积云区含水量分布不均,最大值为1.5 g/m^3,标准差为0.4 g/m^3,而层云区含水量最大值和标准差分别为0.6 g/m^3和0.15 g/m^3,积云区和层云区的云滴谱峰值直径分别为25μm和15μm,云滴数浓度的量级分别为10^2/cm^3和10^1/cm^3。对催化云而言,此次联合探测在4800米层捕捉到嵌入式积云区的催化响应,人工播撒AgI会促进顶层云的消散过程,催化后一小时内云区占比由71%降至13%,云中液态含水量持续减少且趋于均匀分布,催化后十分钟与二十分钟云中含水量的最大值分别为1.0 g/m^3 和0.5 g/m^3,标准差为0.3 g/m^3和0.15 g/m^3,凇附与聚合增长为主要冰相微物理过程,云滴谱先因贝吉龙过程而变窄,后因H-M冰晶凇附繁生而拓宽;在云的中下层则受上层催化影响而产生旺盛云区,十分钟内云区范围显著扩大,云滴及冰晶尺度均增加一倍,同时旺盛云区自上而下扩展。
中文关键词:三机联合探测  层积混合云  云微结构  催化物理响应
 
Studies on Microphysical Response to Aircraft Seeding in Stratiform Clouds with Embedded Convection Using Three Aircrafts’ Joint Observation Data
Abstract:Microphysical responses in stratiform clouds on April 18th, 2009 are studied by analyzing three aircrafts’ observation data. On the basis of distinguishing natural and seeded clouds, observations from radar, satellite and ground-based sites, together with MICAPS reanalysis, are used. The results indicate that the top part of the cloud (above 4800 m) was the main part, with most of the subcooled water accumulated in it. The embedded cumulus part held a temperature measuring 2℃ lower than that of the stratus cloud at the same altitude. while the water concentration in cumulus part varied greatly, Maximum value of water concentration was 1.5 g/m^3, with a standard deviation of 0.4 g/m^3. The maximum water concentration and its standard deviation in the stratus area were 0.6 and 0.15 g/m^3, respectively. The peak diameters of cloud droplet spectra in the cumulus part and stratus part were 25 and 15μm, respectively; and there existed a difference in the cloud drop concentration, with 10^2/cm^3 in the cumulus part and 10^1/cm^3 in the stratus one. For the seeded clouds, the observation revealed a response in the cumulus part at 4800 m. Artificial AgI released in the cloud caused a dissipation in the top part of the cloud, resulting in a decrease in the proportion of cloud area from 71% to 13%. Liquid water in the cloud was consumed and tends to fit an equal distribution. At 10 and 20 minutes after the AgI release, the maximum cloud water concentrations dropped to 1.0 and 0.5 g/m^3, respectively; and their corresponding standard deviations of it were 0.3 and 0.15 g/m^3, respectively. Riming and cohering effects were the major microphysics processes in the ice phase. The cloud droplets spectrum was narrowed because of the Bergeron process at first, and was then widened because of the H-M ice crystal proliferation mechanism. Below the top part, the cloud became vigorous because of the catalytic process there. Within 10 minutes, the cloud ranges increased significantly from top to bottom, with the cloud drops and ice crystals enlarged to double its size horizontally.
keywords:Three aircrafts’ joint observation  Stratiform clouds with embedded convection  Cloud microphysical parameter  Microphysical responses to cloud seeding
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