Simulations of the motion of tropical cyclone-like vortices in the presence of synoptic and mesoscale circulations |
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Authors: | Zhexian Luo Fan Ping |
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Affiliation: | Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science and Technology, Nanjing 210044;Laboratory of Cloud-Precipitation Physics and Severe Storms, Institute of Atmospheric Physics, Chinese Academy of Science, Beijing 100029 |
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Abstract: | Initial mesoscale vortex effects on the tropical cyclone (TC) motion in asystem where three components coexist (i.e., an environmental vortex (EV), aTC, and mesoscale vortices) were examined using a barotropic vorticityequation model with initial fields where mesoscale vortices were generatedstochastically. Results of these simulations indicate that the deflection ofthe TC track derived from the initial mesoscale vortices was clearly smallerthan that from the beta effect in 60% of the cases. However, they mayhave a more significant impact on the TC track under the followingcircumstances. First, the interaction between an adjacent mesoscale vortexand the TC causes the emergence of a complicated structure with two centersin the TC inner region. This configuration may last for 8 h, and the twocenters undergo a cyclonic rotation to make the change in direction of theTC motion. Second, two mesoscale vortices located in the EV circulation maymerge, and the merged vortex shifts into the EV inner region, intensifyingboth the EV and steering flow for the TC, increasing speed of the TC. |
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Keywords: | cyclone-like vortices synoptic and mesoscale circulations |
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