热带气旋路径偏折内在原因的动力分析

THE DYNAMICAL RESEARCH OF TC STRUCTURE ON TRACK DEPARTURE

摘要: 视热带气旋(以下简称TC)为半径等于R的圆形涡旋,对其水平运动方程作整个TC区域的平均,进而得到TC的移动方程。同时,视TC的移动轨迹为一特征弧线,导出了TC移动路径的曲率方程,并对TC的结构及其变化所引起的TC路径偏折规律进行了讨论。结果表明,TC的尺度大小、最大风速及其半径等的变化均能导致路径的偏折,此外,TC的非对称结构也是路径偏折的重要原因。
- 热带气旋 /
- 结构 /
- 路径偏折
Abstract: Taking the tropical cyclone (TC) as a circular vortex with radius R, horizontal motion equations are averaged over the whole TC area to get its movement with non-friction, weak environment. And viewing the TC track as some cambers, we obtain the curvature equation, for discussion of the deviation law effect of the TC structure on track. The results show that TC's scale, maximal velocity and its radius, and their change etc. make TC track deviate, and the TC asymmetry structure also brings the departure to the track. Only more than 2 wave number asymmetry structure can take the departure but the dipole structure (wave number is 1) can't make TC track departure.
- tropical cyclone /
- structure /
- track departure

[1]	陈联寿,丁一汇. 西太平洋台风概论[M]. 北京: 科学出版社,1979,211～213.
[2]	费亮,徐一鸣,雷小途. 我国热带气旋的业务工作及异常运动研究[J]. 大气科学研究与应用,1999,1:114～125.
[3]	FETT, R W, BRAND S. Tropical cyclone movement forecasts based on observations from satellites[J],J.App.Meteo., 1975, 14(4):445～451.
[4]	陈联寿. 热带气旋运动研究和业务预报的现状和发展[C]. 台风会议文集(1985), 1987. 6～30.
[5]	FIORINO M, ELSBERRY R L. Some aspects of vortex structure related to tropical cyclone motion[J], J.Atmos.Sci., 1989, 46: 975～990.
[6]	田永祥. 钭压涡旋中的通风气流与热带气旋移动的关系[J]. 气象学报,1996,54: 83～93.
[7]	徐祥德, 解以杨. 热带气旋运动曲率的数学模型与路径异常的月尖突变判据[J]. 热带气象学报,1993, 9(4): 308～316.
[8]	伍荣生,党人庆,余志豪,等. 动力气象[M]. 上海: 上海科学技术出版社,1983,216～222.
[9]	钮学新. 热带气旋动力学[M]. 北京: 气象出版社,1992.153～159.
[10]	WILSON K J, Characteristics of the subcloud layer wind structure in tropical cyclones[C]. International Conference on tropical cyclones, Parth., Austral, 1979,30～41.
[11]	BLACK P G., Wind transients, vertical structure and gust factors in tropical cyclones[C] .WMO/TD, No,875, 1998,1.2.1～1.2.9.
[12]	WILLOUGHBY H E, BLACK P G. Hurricane Andrew in Florida: dynamics of a disaster[J]. Bull. Amer. Meteor. Soc., 1996,77: 543～549.