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| 云滴数浓度影响混合型层状云降水的数值模拟 | |
| 引用本文： | 杨正卿,银燕,刘聪,周毓荃.云滴数浓度影响混合型层状云降水的数值模拟[J].南京气象学院学报,2012,35(3):350-363. |
| 作者姓名： | 杨正卿 银燕 刘聪 周毓荃 |
| 作者单位： | 1. 南京信息工程大学中国气象局大气物理与大气环境重点开放实验室,江苏南京210044／民航浙江空中交通管理分局,浙江杭州311207 2. 南京信息工程大学中国气象局大气物理与大气环境重点开放实验室,江苏南京,210044 3. 江苏省气象局,江苏南京,210008 4. 中国气象科学研究院,北京,100086 |
| 基金项目： | 科技部公益性行业(气象)科研专项(GYHY，国家科技支撑计划课题，江苏省“333人才工程”项目 |
| 摘 要： | 使用耦合了Morrison双参数微物理方案的中尺度WRF模式V2．2，对2008年1月25-29日发生在我国南方的冰雪天气过程进行了数值试验。在模式准确再现了此次天气过程形势演变特点的基础上，对模式微物理方案中云滴数浓度影响累积降水量的情况进行了敏感性试验，发现云滴数浓度对降水量的影响是复杂和非线性的。对此次天气过程中的微物理量进行了详细的分析，并从各种水成物粒子的发展演变上，讨论了云滴数浓度的增加在暖云和冷云两种降水机制上对降水产生的不同影响。结果表明，云滴数浓度越大，云水混合比就越大，云滴的尺度越小。雨滴对不同云滴数浓度的响应与云滴的情况相反，随着云滴数浓度的增加，雨滴数浓度减小，雨水也减少，暖云降水过程受到了抑制；冰晶和雪晶的数浓度的演变过程没有明显变化，而冰晶和雪晶的混合比是相应增加的，冷云降水过程得到了一定程度的增强。从本文模拟的个例来看，设置不同云滴数浓度所得到的总累计降水量的差异在1％以内。总的来说，增加云滴数浓度，降水量会减少。从比例上来看，增加云滴数浓度对暖云降水过程的抑制作用比对冷云降水过程的增强作用更为显著，但是在本文模拟的个例中，冷云降水过程占主导地位，减少的降水和增加的降水的绝对值在同一个量级上并且数值相近，它们相互抵消后得到的结果是降水量变化的绝对值大大减小了，这解释了增加云滴数浓度后模拟的总累积降水量变化不明显的原因。 |
| 关 键 词： | 云滴数浓度 混合型层状云 降水 |
Numerical simulation of impact of cloud droplet number concentration on precipitation from mixed stratiform and convective clouds |
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| YANG Zheng-qing,YIN Yan,LIU Cong,ZHOU Yu-quan.Numerical simulation of impact of cloud droplet number concentration on precipitation from mixed stratiform and convective clouds[J].Journal of Nanjing Institute of Meteorology,2012,35(3):350-363. | |
| Authors: | YANG Zheng-qing YIN Yan LIU Cong ZHOU Yu-quan |
| Institution: | ( Key Laboratory for Atmospheric Physics and Environment of China Meteorological Administration, NUIST, Nanjing 210044, China; 2. Zhejiang Sub-burean of East China Regional Air Traffic Management Bureau of CAAC, Hangzhou 311207, China; 3. Jiangsu Meteorological Bureau ,Nanjing 210008, China;4. Chinese Academy of Meteorological Sciences ,Beijing 100086, China) |
| Abstract: | The Morrison＇s double-moment microphysics scheme is incorporated into the mesoscale mod- el WRF V2. 2 to simulate the weather process of snow and rain from 00：00 UTC 25 to 12：00 UTC 29 January 2008 in the southem China. Based on the correct simulation of the weather evolvement, the sen-sitivity experiments are used to research the impact of cloud droplet number concentration on accumula-ted precipitation in the microphysics schemes, showing that the impact is complicated and nonlinear. The microphysics properties in the weather process are analyzed in detail. The evolution of each hydromete-or class is analyzed to find out the effect of cloud droplet number concentration increase on the warm cloud and cold cloud precipitation processes. Results indicate that the higher cloud droplet number con-centration is, the higher cloud water mixing ratio is, and the smaller cloud droplet size is. In addition, the response of rain droplet to cloud droplet number concentration is opposite to the response of cloud drop-let. The higher cloud droplet number concentration is, the lower rain droplet number concentration is, and the lower rain water mixing ratio is, which leads to the warm cloud precipitation to be inhibited. Be-cause of the increase of cloud droplet number concentration, the number concentration of ice crystal and snow have no obvious change. However, the mixing ratio of ice crystal and snow becomes higher as the cloud droplet number concentration increases, so the cold cloud precipitation is enhanced. This case is simulated by using different cloud droplet number concentration, the difference of total precipitations is less than 1%. In general, the precipitation decreases when the cloud droplet number concentration in-creases. The proportion of decrease of warm cloud precipitation is much higher than that of increase of cold cloud precipitation. However, in this case, the dominant process is cold cloud precipitation. The ab-solute values of decreased and increased precipitations are similar and of the same order of magnitude. The result of their counteraction is that the value of total simulated precipitation has no obvious change when the cloud droplet concentration increases. |
| Keywords: | cloud droplet number concentration mixed stratiform and convective clouds precipitation |
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