| 气溶胶浓度对暖云不同生长阶段物理特征影响的模拟研究 |
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| 引用本文： | 余国行,杨素英,胡成戎,刘炫炫,李娅茹,龙祉怡.气溶胶浓度对暖云不同生长阶段物理特征影响的模拟研究[J].气象与环境学报,2022,38(3):52-64. |
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| 作者姓名： | 余国行 杨素英 胡成戎 刘炫炫 李娅茹 龙祉怡 |
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| 作者单位： | 南京信息工程大学, 江苏 南京 210044 |
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| 基金项目： | 省级大学生创新创业训练计划(202110300003Z);国家自然科学基金项目(41575133);科技部重点研发计划项目(2017YFC1501404) |
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| 摘 要： | 基于云微物理过程完善的TAU2D分档云模式, 模拟研究了用热泡扰动生成的暖云在不同气溶胶数浓度(Na)背景条件下各演变阶段云微物理量的变化特征。结果表明: 在暖云的发展过程中Na越高, 云滴尺度变小, 云滴间的碰并增长发动较晚, 云滴谱因碰并增长而实现的滴谱拓宽变弱, 云滴谱相对较窄, 云滴谱标准差较小, 因此云体发展越缓慢, 云体生命周期越长, 形成降水就越晚; 反之, 云滴尺度越大, 碰并增长发动越早, 云滴谱拓宽更明显, 云滴谱标准差越大, 云体生命周期相对更短, 降水开始时刻越早。高Na背景下, 碰并阶段云滴谱较凝结阶段更宽, 沉降阶段因云体下沉蒸发导致小尺度云滴减少, 使其滴谱较碰并阶段略有拓宽。在凝结阶段, 低气溶胶背景下云滴数浓度(N)和离散度(ε)间呈现正相关关系, 而高气溶胶背景下两者为负相关关系。在碰并阶段, N与ε的相关性关系为负相关, 且随着气溶胶数浓度的增加, 负相关程度降低。在沉降阶段, N和ε间为负相关关系。
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| 关 键 词： | 气溶胶 暖云 凝结增长 碰并增长 模拟 |
| 收稿时间： | 2022-01-18 |
Simulation on impacts of aerosol number concentration on physical characteristics of warm clouds during different growth stages |
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| Guo-hang YU,Su-ying YANG,Cheng-rong HU,Xuan-xuan LIU,Ya-ru LI,Zhi-yi LONG.Simulation on impacts of aerosol number concentration on physical characteristics of warm clouds during different growth stages[J].Journal of Meteorology and Environment,2022,38(3):52-64. |
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| Authors: | Guo-hang YU Su-ying YANG Cheng-rong HU Xuan-xuan LIU Ya-ru LI Zhi-yi LONG |
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| Institution: | Nanjing University of Information Science & Technology, Nanjing 210044, China |
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| Abstract: | Based on the TAU2D cloud model with complete cloud microphysical processes, cloud microphysical characteristics of warm clouds generated by thermal turbulence under different aerosol concentrations(Na) were simulated.The results showed that with higher Na, cloud droplets radius becomes smaller, the collision coalescence of cloud droplets occurs later, and the broadening of cloud droplet spectral due to the collision-coalescence effect becomes weak, which results in narrower cloud droplet spectral with smaller standard deviation, slower development and longer life time of clouds, and later occurrence of precipitation.Otherwise, the larger size of cloud droplets tends to generate earlier collision-coalescence growth, distinct broadening of cloud droplet spectral with larger standard deviation, longer cloud life time, and earlier occurrence of precipitation.In the presence of high Na, the cloud droplet spectral exhibits a wider range during the collision-coalescence stage than in the condensation growth stage.During the deposition stage, the evaporation of clouds reduces small cloud droplets and thus makes the cloud droplet spectral slightly wider than that during the collision-coalescence stage.During the condensation growth stage, there is a positive correlation between cloud droplet number concentration (N) and relative dispersion degree(ε) under low Na conditions, while a negative correlation between them occurs under high Na conditions.During the collision-coalescence stage, there is a negative correlation between N and ε, and such a negative correlation is weakened with the increase of Na.In the deposition stage, there is a negative correlation between N and ε. |
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| Keywords: | Aerosol Warm cloud Condensation growth Collision-coalescence growth Simulation |
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