地形对涡量传播和台风切向风速变化的参数敏感性

余锦华

地形对涡量传播和台风切向风速变化的参数敏感性

余锦华

南京信息工程大学, 江苏, 南京, 210044

基金项目: 国家科学技术部专项项目(2001DIA20026);国家自然科学基金项目(49975013)资助

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出版历程
- 收稿日期: 2003-08-19
- 修回日期: 2003-12-01

THE TOPOGRAPHIC PARAMETER SENSITIVITY TO VORTICITY PROPAGATION AND TYPHOON TANGENTIAL VELOCITY CHANGES

YU Jin-hua

Nanjing University of Information Science & Technology, Nanjing 210044, China

摘要

摘要: 设计了一个高分辨率的浅水模式,以研究地形参数和纬向基流在涡旋Rossby波传播和台风切向风速变化中的作用。结果表明,无纬向基流条件下,岛屿地形的水平尺度对涡旋Rossby波传播的影响表现在:随地形水平方向尺度的增大,扰动涡度场环绕地形顺时针方向旋转的趋势增强,局域风速增幅减小,增强了平均风速的减弱。纬向东风基流条件下,热带气旋的局域风速及其平均切向风速的演变受台风与地形间距的改变以及地形作用时间长短的影响:当台风逐渐靠近地形时,局域风速增幅增强,平均风速逐渐减小;当台风逐渐远离地形时,出现相反的变化。
- 地形参数 /
- 涡旋Rossby波 /
- 台风切向风速
Abstract: A high resolution shallow-water model is designed to study the roles which the topographical parameter and latitudinal basic flow play in the propagation of vortex Rossby waves and typhoon tangential velocity changes. With no latitudinal flow, the horizontal scale effects of island rerrain on the vortex Rossby waves propagation show that the disturbance vorticity follows a clockwise island-circulating path more significantly, the local maximum wind speed amplitude reduces more sharply, the maximum mean azimuthally tangential wind spins down more substantially, when the topographic horizontal scale augments. With the latitudinal basic flow, the evolution of local wind and mean velocity are affected by the distance changes between TC and the terrain and the time length of topographic action: the local wind amplitude intensifies and the mean velocity diminishes while the distance is shortening; the opposite is true while TC is away from the terrain gradually.
- topography parameters /
- vortex Rossby waves /
- typhoon tangential velocity

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参考文献(18)

[1]	袁金南,万齐林.岛屿地形和对流凝结潜热对登陆台风"黄蜂"影响的数值研究[J].热带气象学报,2003,19:81-87.
[2]	陈联寿,孟智勇.我国热带气旋研究十年进展[J].大气科学,2001,25:420-432.
[3]	BRAND S. Rapid intensification and low latitude weakening of tropical cyclone of the western North Pacific Ocean[J].J App Meteo, 1973, 12: 94-103.
[4]	BRAND S, BLELLOCH J. Changes in the characteristics of typhoons crossing the island of Taiwan[J]. Mon Wea Rev, 1974,102: 130-155.
[5]	余晖,端义宏.西北太平洋热带气旋强度变化的统计特征[J].气象学报,2002,60:680-687.
[6]	梁必骐,陈杰.近海加强的登陆台风统计分析[A].全国热带气旋科学讨论会论文集[C].北京:气象出版社,2001.180-185.
[7]	李江南,王安宇,杨兆礼,等.用QuikSCAT资料分析"黄蜂"登陆前后近地层风场的分布特征[J].热带气象学报,2003,19:88-96.
[8]	BENDER M A, TULEYA R E, KURIHARA Y. A numerical study of the effects of island terrain on tropical cyclones[J].Mon WeaRev, 1987, 115: 130-151.
[9]	KUO H C, WILLAMS R T, CHEN J H, et al. Topographic effects on barotropic vortex mption: no mean flow[J]. J Atmos Sci,2001, 58: 1310-1327.
[10]	MONTGOMERY M T, KALLENBACH R J. A theory for vortex Rossby-waves and its appliation to spiral bands and intensity changes in hurricanes[J]. Quart J Roy Meteor Soc, 1997, 123: 435-465.
[11]	WANG Y. Vortex Rossby waves in a numerical simulated tropical cyclone, Part Ⅱ: The role in tropical cyclones structure and intencity changes[J]. JAtmos Sci, 2002, 59: 1239-1262.
[12]	余志豪.台风螺旋雨带--涡旋Rossby波[J].气象学报,2002,60:502-507.
[13]	罗哲贤,陈联寿.地形对涡旋Rossby波影响的研究[J].自然科学进展,2003,13:372-377.
[14]	LIN Y L,HAN J,HAMILTON D W.Orographicinfluence on a drifting cyclone[J].JAtmos Sci,1999,56:534-562.
[15]	董秉纲,尹协远,朱克勤.涡运动理论[M].合肥:中国科学技术大学出版社,1994.1-9.
[16]	ENAGONIO J, MONTGOMERY M T. Tropical cyclogenesis via convectively forced vortex Rossby waves in a shallow water primitive equation model[J]. JAtmos Sci, 2001, 58: 685-705.
[17]	MCWILLIAMS J C. A uniformly valid model spanning the regimes of geostrophic and isotrophic, stratified turbulence:Balanced turbulence[J]. JAtmos Sci, 1985, 42: 1773-1774.
[18]	YU Jinhua, XU Xiangde, CHEN Lianshou, et al. A Numerical Study on vorticity propagation and changes in typhoon intensity[J].A MS, 2003, 17: 129-145.