大气科学2012，Vol.36Issue(3)：471-486,16.DOI:10.3878/j.issn.1006-9895.2011.10223
云并合过程中物理特征演变的模拟研究
Simulation of Physical Characteristics Evolution in Cloud Merger
摘要
Abstract
Physical characteristics evolution in cloud merger is critical to the evolution of cloud precipitation, which is also important for short-term forecasting and study of precipitation. So, in this paper, using WMF (Weather Research and Forecasting) model, the authors simulated a merging process in Guiyang on 5 May 2005, combined radar observations and MICAPS (Meteorological Information Comprehensive Analysis and Processing System) data, and analyzed the processes of precipitation convection merger and the evolution of associated physical characteristics. The cumulus merger processes are of diversification, experience the process from neighbouring isolated cells merging to cell-cloud cluster merging, and neighbouring cloud clusters merging into widespread precipitation system. In the merging processes of several stages, the change of temperature stratification structure curve all shows that unstable energy releases during the merging, and unstable stratification before merging tends to more stable stratification after merging, especially at middle levels, tends to neutral one, which is advantageous for the dominant development scale becoming longer. The physical characteristics alter significantly, which shows that before and after the first merging and complete merging, the maximum precipitation at the convective center all increases strongly. However, the changing of the maximum upward flow velocity is contrary to the changing of the maximum precipitation. The maximum upward flow velocity generally decreases after the merging. While, the average upward flow velocity all decreases before and after the first merging and complete merging. The average precipitation in the whole cloud region mostly tends to increase.关键词
对流/并合/数值模拟/物理特征Key words
convection/merger/numerical simulation/physical characteristics分类
天文与地球科学引用本文复制引用
吕玉环,李艳伟,金莲姬,何彩芬..云并合过程中物理特征演变的模拟研究[J].大气科学,2012,36(3):471-486,16.基金项目
国家自然科学基金资助项目40975086、41075029,中国科学院知识创新工程重要方向项目KZCX2-EW-203,江苏省青蓝工程云雾降水与气溶胶研究创新团队,江苏高校优势学科建设工程 （）
