Study of Helicity in Typhoon Rainfall Regions——A Case Study of Typhoon “ Muifa”

• 作者: Hu Banghui Huang Hong Huang Weiqi Wang Ju
• 来源期刊: 气象与环境研究：英文版
• 学科: 地球科学
• 关键词: Center of figure method Center of mass method Vertical helicity Rainfall regions China
• 年，卷（期）: 2016,（1）
• 页码范围: 10-13
• 页数: 4页
• 分类号: P

摘要

Using the center of figure method and center of mass method,precipitation and heavy precipitation processes caused by No.9 typhoon "Muifa" in 2011 were analyzed based on helicity,and the mechanism of typhoon rainfall was interpreted from the relation between helicity and energy. The results showed that horizontal helicity checked the diffusion of nonlinear energy and maintained the development of the system. Precipitation mainly appeared on the southeast of vertical helicity,while heavy precipitation mainly occurred on its southwest. Compared with the center of figure method,the center of mass method had good results,especially for heavy precipitation. Vertical helicity at 700 hPa reflected system deviation in rainfall regions well and had the best correction effect on rainfall intensity and regions