ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Re-understanding the interaction among the multi-scale synoptic systems during heavy rain over North ChinaSUN Jisong
- Article
- Figures
- Metrics
- Preview PDF
- Reference
- Related
- Cited by
- Materials
Abstract:
The heavy rain events in North China include regional or valley torrential rain, also contain local strong precipitation only covering several hundreds to thousands km2 area. Essentially, the heavy rain events result in interaction among multi-scale synoptic systems with diversity of dynamical structures. However, it is not easy to resolve the interaction processes of every torrential rain event. On the views of the multi-scale synoptic systems and their interactions, the paper sums up the main mechanisms of heavy rainfall in North China by reconstructing interrelated research achievements：(1) Synoptic scale systems act as controlling functions in large area torrential rainfall processes. Their dynamical properties constructed by variously essential factors play leading roles on large scale moisture convergence strength,the ascending motion intensity and the duration; As far as the rainfall intensity and the location of extreme precipitation during a heavy rain event, the mesoscale systems are decisive factors. They are possible to be derived by the interaction of synoptic scale systems, induced by the complex underground surface such as terrains, urbans and interface between land and sea, and engendered by feedback effect of local strength precipitation; To the extreme precipitation intensity during heavy rain events over North China, the generation, development, structure evolution and organization of deep convective storms are the key factors. (2) The exceptionally complex nonlinear interaction processes exist in every torrential rain events over North China by variously interactions among the different scale synoptic systems and complicated underground forcing. It is actually difficult that any unitary system or isolated dynamical process are perfectly separated from the complex interaction whether by actual observed data or numerical simulation, in other words, the complex nonlinear interaction process itself is a weather life system built by diversity feedbacks each other. Some scientific themes on heavy precipitation events in North China, which should be resolved in future, are discussed in last part of the paper.
Keywords:
Project Supported:
Clc Number:
Mobile website
