主办单位：中国气象局沈阳大气环境研究所
国际刊号：ISSN 1673-503X
国内刊号：CN 21-1531/P
气象与环境学报

气象与环境学报 ›› 2022, Vol. 38 ›› Issue (6): 48-56.doi: 10.3969/j.issn.1673-503X.2022.06.006

• 论文 • 上一篇    下一篇

山西太原地区一次暖云云滴谱离散度和云滴数浓度垂直分布特征

伊智铭1(),杨素英1,*(),李义宇2,康娜1,余国行1,李娅茹1,张严哲1   

  1. 1. 南京信息工程大学中国气象局气溶胶-云降水重点实验室, 江苏南京 210044
    2. 山西省人工增雨防雹办公室, 山西太原 030032
  • 收稿日期:2021-02-03 出版日期:2022-12-28 发布日期:2022-12-27
  • 通讯作者: 杨素英 E-mail:836081581@qq.com;ysy@nuist.edu.cn
  • 作者简介:伊智铭, 男, 1995年生, 在读硕士研究生, 主要从事云降水物理观测和数值模拟研究, E-mail: 836081581@qq.com
  • 基金资助:
    科技部重点研发计划项目(2017YFC1501404);国家自然科学基金项目(41575133);省级大学生创新创业训练计划(202110300003Z)

The vertical distribution characteristics of the spectral dispersion and the number concentration of cloud droplets during a warm cloud process in Taiyuan of Shanxi province

Zhi-ming YI1(),Su-ying YANG1,*(),Yi-yu LI2,Na KANG1,Guo-hang YU1,Ya-ru LI1,Yan ZHANG1   

  1. 1. Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, School of Atmospheric Physics, Nanjing University of Information Science and Technology, Nanjing 210044, China
    2. Weather Modification Office, Meteorological Disasters Defense Technology Center, Meteorological Service of Shanxi Province, Taiyuan 030032, China
  • Received:2021-02-03 Online:2022-12-28 Published:2022-12-27
  • Contact: Su-ying YANG E-mail:836081581@qq.com;ysy@nuist.edu.cn

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摘要：

基于2018年8月31日山西太原地区的一次暖云观测资料, 对云滴数浓度(Nc)和云滴谱离散度(ε)垂直分布特征进行了分析。结果表明: Nc和ε随高度变化复杂, 云中垂直速度、逆温区和夹卷均为影响ε和Nc垂直分布的重要因子。上升气流(或下沉气流)随高度增加而增强(减弱)时, ε和Nc均随高度增加而增大, 且两者呈正相关。云中存在上升速度或下沉速度极大值时, 上升气流易产生碰并增长, Nc随高度增加而减小, 与ε呈负相关, 而下沉气流则促进气溶胶再活化使得云滴增多, 与ε呈负相关。云中逆温区厚度和强度影响逆温区及其上部云区的ε垂直分布及Nc和ε间的相关性, 逆温层较厚时, ε随高度增加而减小, Nc与ε呈正相关。逆温层较薄时, ε随高度的增加而增大, Nc和ε呈负相关。逆温区上部云中未饱和, 云滴蒸发, Nc和ε分别随高度增加而减小, Nc和ε呈正相关。云顶附近夹卷作用使Nc随高度增加而减小, Nc与ε呈正相关。

关键词: 离散度, 垂直速度, 夹卷, 逆温区

Abstract:

Based on an aircraft observation of a warm cloud in Taiyuan, Shanxi province on August 31, 2018, we analyzed the vertical distribution and causes of the number concentration (Nc) and spectral dispersion (ε) of cloud droplet.The results show that Nc and ε vary complexly with altitude, and their vertical distributions are mainly affected by vertical velocity, inversion zone, and clamp coil in clouds.When the upwelling (or downwelling) increases (weakens) with height, both ε and Nc increase, and show a positive correlation with each other.When there is a maximum of upwelling or downwelling, the upwelling is easy to produce collision coalescence growth, and Nc decreases with the increase of height and has a negative correlation with ε.However, the downwelling promotes aerosol reactivation and then makes cloud droplets increase and has a negative correlation with ε.The thickness and intensity of the inversion zone affect the vertical distribution of ε and the correlation between Nc and ε in the inversion zone and its upper cloud area.When the inversion layer is thicker, ε decreases with the increase in height, and Nc and ε are positively related.Inversely, when the inversion layer is thin, ε increases with the increase of height, and Nc and ε are negatively related.The upper cloud in the inversion area is not saturated, and the cloud droplet is evaporated, both Nc and ε decrease with increasing height and are positively correlated.The entrainment near the cloud top makes Nc decrease with the increase in height, and there is a positive correlation between Nc and ε.

Key words: Dispersion, Vertical velocity, Entrainment, Inversion zone

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