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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| Institution: | 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 a
system where three components coexist (i.e., an environmental vortex (EV), a
TC, and mesoscale vortices) were examined using a barotropic vorticity
equation model with initial fields where mesoscale vortices were generated
stochastically. Results of these simulations indicate that the deflection of
the TC track derived from the initial mesoscale vortices was clearly smaller
than that from the beta effect in 60% of the cases. However, they may
have a more significant impact on the TC track under the following
circumstances. First, the interaction between an adjacent mesoscale vortex
and the TC causes the emergence of a complicated structure with two centers
in the TC inner region. This configuration may last for 8 h, and the two
centers undergo a cyclonic rotation to make the change in direction of the
TC motion. Second, two mesoscale vortices located in the EV circulation may
merge, and the merged vortex shifts into the EV inner region, intensifying
both 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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