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Advances in Mechanical Engineering
Volume 2011 (2011), Article ID 782590, 9 pages
http://dx.doi.org/10.1155/2011/782590
Research Article

Multiple-Scale Interactions Affecting Tropical Cyclone Track Changes

1Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science and Technology, 219 Ning Liu Road, Nanjing 210044, China
2Center for Australian Weather and Climate Research, Bureau of Meteorology, 295 Ann Street Brisbane, Melbourne, VIC 3001, Australia
3Key Laboratory of Cloud-Precipitation Physics and Severs Storms (LACS), Institute of Atmospheric Physics, Chinese Academy of Science, 40 Hua Yan Li Road, Beijing 100029, China
4Atmospheric Sciences Division of Wuxi Research Center of Environment Science and Technology, 12 Qian Ao Road, Wuxi 214031, China

Received 19 November 2010; Revised 9 May 2011; Accepted 18 July 2011

Academic Editor: Yaya Tan

Copyright © 2011 Zhexian Luo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Tropical Cyclone (TC) track changes associated with Rossby wave energy dispersion are simulated in a shallow water primitive equation model with an initial field where a TC is located south of a subtropical high. An anticyclone east of the TC appears because of Rossby wave energy dispersion. The connection of the anticyclone with the subtropical high leads to a poleward TC track deflection. The TC eventually moves across the axis of the subtropical ridge. The formation of the track may be attributed to the nonlinear interaction between the subtropical high and the TC. This work validates the conceptual model proposed by previous observational research. The scenario of the nonlinear interaction between the TC and the subtropical high may also be modified through the influence of mesoscale vortices. The main modifications are (1) the anticyclone induced by energy dispersion of the TC weakens, (2) the connection between the anticyclone and the subtropical high is delayed, and (3) the TC shifts more westward and does not move across the ridge axis. We propose that some of the mesoscale vortices are axisymmetrized by the TC and results in an increase in TC size which modifies the properties of the energy dispersion. The phase and group speeds decrease and produce a simulated track deflection to the left compared to the simulation without mesoscale vortices. Our numerical results demonstrate that multiple scale nonlinear interactions have an essential role in influencing TC track changes.