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Numerical Study on microphysical processes of Two Different Snowfall Cases in Northern China

Acta meteorologica Sinica 2007年第4期21卷 420-437页

作者：孙晶王鹏云李想逯莹 Institute of Atmospheric Physics Chinese Academy of Sciences Chinese Academy of Meteorological Sciences Shuangyashan Meteorological Bureau of Heilongjiang Province

In this paper, two snowfall cases under different weather conditions in northern China are simulated by using the meso scale model MM5. Two-way nesting structure of domains is designed for each case. Among the explicit schemes of MM5, the Reisner graupel scheme is selected to describe the microphysical process. The simulated snow-bands of two cases are basically consistent with observations. The simulated results of microphysical processes are mainly discussed. The hydrometeors and their sources and sinks under different weather backgrounds are described. The feedback effects of microphysical processes on the thermal and dynamic processes are also discussed. Method that outputs the accumulative sources and sinks per hour is used to analyze the distribution characteristics of hydrometeors during the strongest snowfall period. Two sensitivity tests （called heat test and drag test） are conducted to examine the effects of microphysical processes on cloud produced by the latent heat and drag force. Results have shown that the distribution of particles has a close relation with temperature. The temperature of Beijing snowfall is under 0℃ and there exist vapor and solid phase particles, while Liaoning snowfall has vapor, liquid, and solid phase particles due to the warm temperature. The distribution of these particles is not the same at different development stages. From the analyses of the characteristics of sources and sinks, it is found that snow is mainly produced by the deposition and accretion with ice. Cloud water is crucial to graupel. The melting of ice-phase particles enhances the rain production. The results of heat tests and drag tests reveal that the microphysical processes have interacted with the dynamic and thermal processes. Latent heat release of hydrometeors feeds back positively on snowfall while the drag force not. At last, comparisons of simulated results have been done between the two different kinds of snowfall cases. The microphysical processes o

关键词： snowfall mesoscale model MM5 microphysical process sources and sinks

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NUMERICAL SIMULATION OF MICROBURST

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Chinese Journal of Aeronautics 1998年第3期11卷 18-25页

作者：蒋道玲金长江孙庆民 Faculty 509 Nanjing Univ. Aero. and Astronaut. Beijing 100083 China Flight Test Dept. Aviation Industries of China Beijing 100000 China

Based on the atmospheric dynamics, a two dimensional, slab symmetric numerical microburst model is developed. The model subdivides water substance into five types, including water vapor, cloud droplets, rainwater, ice crystals and graupels (hails), considering the detailed microphysical processes of warm cloud and ice phase as well. By the model the wet microburst is numerically simulated with an agreeable result. In addition, ten experiments are conducted in order to examine the microburst sensitivity to environmental conditions.

关键词： microbursts water substance microphysical process microburst sensitivity

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Simulation of the evolution of the latent heat processes in a mesoscale convective system accompanied by heavy rainfall over the Guangzhou region of South China

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Atmospheric and Oceanic Science Letters 2017年第1期10卷 58-64页

作者： LI Jiang-Nan WU Kai-Lu DING Cheng-Hui YANG Chao-Feng LI Fang-Zhou WANG Dong-Hai FENG Ye-Rong School of Atmospheric Sciences Sun Yat-sen UniversityGuangzhouChina State Key Laboratory of Severe Weather(LaSW) Chinese Academy of Meteorological SciencesBeijingChina Guangdong/CMA Key Laboratory of Regional Numerical Weather Prediction GuangzhouChina

A cloud-scale WRF simulation was used to investigate the cloud microphysical processes and threedimensional structure of latent heat budgets in different stages of a mesoscale convective system（MCS） accompanied by heavy rain that occurred in the Guangzhou region of South *** results enable us to draw the following conclusions：（1） During the development and mature stages,the main heating processes were condensation below 400 hPa and deposition above 400 *** main cooling processes were evaporation and *** the dissipation stage,all the microphysical processes were weak.（2） Water vapor condensed into cloud water,and rainwater significantly contributed to all stages of the MCS.（3） During every stage of the MCS,the primary cooling microphysical process was the evaporation of rainwater,which was maximum during the mature stage.

关键词： Mesoscale convective system microphysical process latent heat budget

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Satellite Retrieval of a Strong Hailstorm process

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Atmospheric and Oceanic Science Letters 2009年第2期2卷 103-107页

作者： LIU Guihua YU Xing DAI Jin Weather Modification Center of Shaanxi Province Xi＇an 710015 China Meteorological Institute of Shaanxi Province Xi ＇ an 710015 China

A case of hailstorm process occurring on 24 June 2006 in northwestern China was studied using satellite retrieval methodology. The particle effective radius (re) in the cloud tops was calculated by the reflectance in the 3.7 μm channel, and cloud-top microphysical properties were vividly represented using the RGB visual multispectral classification scheme. The microphysical zones of clouds and the processes of hail formation and develop-ment are inferred using the relations of cloud-top temperature (T) versus re for the tops of convective clouds. The results show that particle effective radius was smaller near the cloud base of hailstorm. There was a deep zone of diffusional droplet growth at the low level where the particles grew slowly with height, and there existed an evident area of small ice particles in the cloud top, suggesting the existence of a strong updraft in the clouds. The low glaciated temperature indicated a great depth from the cloud base to the glaciation height, which provided a deep layer of supercooled water for hail growth.

关键词： satellite retrieval hail cloud microphysical process T-re relation

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A REVIEW OF THE ANALYSIS OF MOISTURE VARIABLES AND THE APPLICATION IN NUMERICAL MODELS

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Journal of Tropical Meteorology 2007年第1期13卷 81-84页

作者：王在志闫敬华 National Climate Center CMA Beijing 100081 China Guangzhou Institute of Tropical and Marine Meteorology CMA Guangzhou 510080 China Guangzhou Institute of Tropical and Marine Meteorology CMA

The application of the explicit microphysical process in the high-resolution mesoscale numerical models makes it necessary to analyze the moisture variables such as the cloud water, cloud ice and rain water to initialize the explicit predicted fields. While the inclusion of moisture variables in initial fields can influence the whole performance of the model significantly, it can also reduce the spin-up time and increase the short-term forecasting ability of the model since the dynamical fields become more accordant with the thermodynamic fields. Now the increase of the observing ability and the abundance of the data promote the development of ways to analyze the moisture variables. A review of some methods to analyze the moisture variables is presented, and the situation and problems of the application in the numerical models are also discussed in this paper.

关键词： mesoscale numerical model microphysical process moisture variable analysis assimilation

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