摘要
对 1 999年 6月梅雨锋频发型中尺度低压 (扰动 )及其暴雨代表个例 ,利用区域中尺度数值模式MM5进行了数值研究。基准试验成功复制出中尺度低压 (扰动 )和暴雨的发生发展过程 ,系统和降水的演变与强度结果比较合理。借助于高时空分辨率的模式输出 ,在一定程度上可以揭示中尺度低压 (扰动 )发生发展较详细的演变过程 ,同时也可描述出发展演变中某些更加细微的特征和反映对流层高低空气流的特征以及它们之间的相互作用。在基准试验基础上设计的一组数值试验 ,探讨了同中尺度低压 (扰动 )暴雨相关的物理过程 ,包括降水的显、隐式参数化方案 ,凝结潜热释放 ,行星边界层过程 ,局地地形对中尺度低压 (扰动 )及其所伴暴雨发生发展的影响。这些结果能在更加深入理解梅雨锋上两类中尺度低压 (扰动 )及其暴雨过程的具体物理图象方面提供一些有益的帮助。
A numerical study of two kinds of mesoscale low (disturbance) and associated heavy rainfall on Meiyu front is carried out, aiming to further study their characteristics and physical mechanism of formation and development. By using the mesoscale numerical model MM5, the two mesoscale low (disturbance) and associated heavy rainfall are successfully simulated. Based on the model output with high spatial and time resolution, some detailed characteristics of low (disturbance) are obtained, the characteristics of upper level and low level flow and interaction between them are also revealed. In addition, the effect on mesoscale low (disturbance) and associated heavy rainfall of some physical processes are discussed, which include the parameterization scheme of precipitation, latent heating release, PBL process and the impact of local terrain.
出处
《气候与环境研究》
CSCD
2004年第4期641-657,共17页
Climatic and Environmental Research
基金
国家自然科学基金资助项目 40 40 5 0 2 0
国家重点基础研究发展规划项目"我国重大天气灾害形成机理和预测理论研究" (G1 9980 40 90 7)资助
关键词
中尺度低压(扰动)
梅雨锋
暴雨
数值研究
高低空相互作用
numerical study
mesoscale low (disturbance)
Meiyu front
heavy rainfall
interaction between upper level and lower level
