A cloud-resolving study on the role of cumulus merger in MCS with heavy precipitation

被引：1

作者：

Danhong Fu

Xueliang Guo

机构：

[1] Chinese Academy of Sciences,Laboratory of Cloud

[2] Graduate University of Chinese Academy of Sciences,Precipitation Physics and Severe Storms (LACS), Institute of Atmospheric Physics

来源：

Advances in Atmospheric Sciences | 2006年 / 23卷

关键词：

MM5; MCS; cloud merger; lightning; precipitation;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The cumulus merging processes in generating the mesoscale convective system (MCS) on 23 August 2001 in the Beijing region are studied by using a cloud-resolving mesoscale model of MM5. The results suggest that the merger processes occurred among isolated convective cells formed in high mountain region during southerly moving process play critical role in forming MCS and severe precipitating weather events such as hailfall, heavy rain, downburst and high-frequency lightning in the region. The formation of the MCS experiences multi-scale merging processes from single-cell scale merging to cloud cluster-scale merging, and high core merging. The merger process can apparently alter cloud dynamical and microphysical properties through enhancing both low-and middle-level forcing. Also, lightning flash rates are enhanced by the production of more intense and deeper convective cells by the merger process, especially by which, the more graupel-like ice particles are formed in clouds. The explosive convective development and the late peak lightning flash rate can be found during merging process.

引用

页码：857 / 868

页数：11

共 68 条

[1] Carey L. D.(1998)Electrical and multiparameter radar case study of the microphysical evolution of a lightning producing storm Meteor. Atmos. Phys. 59 33-64
[2] Rutledge S. A.(2000)The relationship between precipitation and lightning in tropical island convection: A c-band polarimetric radar study Mon. Wea. Rev. 128 2687-2710
[3] Carey L. D.(2003)Evolution of cloud-to-ground lightning and storm structure in the Spencer, south Dakota, tornadic supercell of 30 May 1998 Mon. Wea. Rev. 131 1811-1831
[4] Rutledge S. A.(2001)Numerical simulation of tornadogenesis in high-precipitation supercell. Part I: Storm evolution and transition into a bow echo J. Atmos. Sci. 58 1597-1629
[5] Carey L. D.(2003)Numerical study on the formation a severe storm accompanied with gale and heavy rain in Beijing Journal of Nanjing Institute of Meteorology 26 190-200
[6] Petersen W. A.(2003)The formation process and cloud physical characteristics for a typical disastrous wind-producing hailstorm in Beijing Chinese Science Bulletin 48 77-82
[7] Rutledge S. A.(1977)Radar characteristics of tropical convection obserbed during GATE: Mean properties and trends over the summer season Mon. Wea. Rev. 105 964-980
[8] Finley C. A.(1987)A study on numerical simulation of cloud mergers and interactions Science in China(B) 17 214-224
[9] Cotton W. R.(1987)The effects of the existence of stratiform cloud on the development of cumulus cloud and its precipitation Acta Meteorologica Sinica 45 72-77
[10] Pielke R. A.(1990)Some characteristics of thunderstorms over Bathurst and Melville Islands near Darwin, Australia Quart. J. Roy. Meteor. Soc. 116 1153-1172

← 1 2 3 4 5 6 7 →