PRELIMINARY STUDY ON RELATIONSHIP BETWEEN DOUBLE VORTICES SELF-ORGANIZATION AND TYPHOON FORMATION IN BAROCLINIC ENVIRONMENT

• Published in: Journal of Tropical Meteorology Vol. 16; no. 4; p. 372
• Main Authors: Teng, Dai-gao, Luo, Zhe-xian, Pan, Jing-song, Yu, Hui
• Format: Journal Article
• Language: English
• Published: Guangzhou Guangzhou Institute of Tropical & Marine Meteorology 01.12.2010; Zhejiang Meteorological Observatory, Hangzhou 310017 China%School of Remote Sensing, NUIST, Nanjing 210044 China%Shanghai Typhoon Institute of CMA, Shanghai 200030 China
• Subjects: typhoon formation; baroclinic atmosphere; self-organization of double vortices
• ISSN: 1006-8775
• DOI: 10.3969/j.issn.1006-8775.2010.04.009

The relationship between the self-organization of double vortices (SODVs) and the formation of typhoons was discussed based on six numerical experiments with the Fifth-Generation National Center for Atmospheric Research/Penn State Mesoscale Model (MM5) and further discussion was made with a real typhoon case. The results showed that there is a critical distance d sub( c) for SODVs in baroclinic atmosphere. When the distance between separated vortices is smaller than or equal to d sub( c), the double vortices self-organize into a typhoon-like vortex with two spiral bands. But the double vortices cannot have such organization if the distance between them is larger than d sub( c). The value of d sub( c) is about 380 km in the context of ideal conditions in this paper, larger than that achieved in a barotropic model. A typical typhoon case in 2005 (Haitang) was selected to verify the above-mentioned conclusions. It was found that the SODV is one of the important and typical ways for the formation of typhoons.