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A Numerical Simulation and Analysis of Hurricane Wilma’s Concentric Eyewall

Author: WangGuoRong
Tutor: LuoZheXian
School: Nanjing University of Information Engineering
Course: Meteorology
Keywords: Eyes wall WISHE Tracer particle analysis moat area Eyewall replaces the process
CLC: P444
Type: Master's thesis
Year: 2007
Downloads: 87
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In this paper, a high-resolution numerical model WRF simulated Typhoon Wilma eyes wall structure formation as well as the eyes wall monocular wall replaced the entire process, first analyzed on the basis of the environmental vertical shear typhoon strength and structure, followed by the typhoon eye area, inside and outside the eyewall and moat area, a more detailed analysis, focusing on analysis of the eyewall of the typhoon vortex, the eyes and wall structure, the moat area characteristics, and the eyewall replace process, and tried by the evolution of the abnormal potential vorticity to explain the reasons for the formation of the outer eye wall. Finally, still typhoon place the tracer particles, the different regions by analyzing the movement of these particles to further study the possible reasons typhoon internal region (structure) the relationship between and the outer eye wall forming. The analysis showed that: the environmental vertical shear the wilma structure has an important influence convection strong area, large radial outflow area and so are mainly concentrated in the left side of the downwind and under the direction of the wind vertical shear; Wilma eyewall vortex eyewall vortex morphology similar to the vortex Rossby wave counter-clockwise around the center of the typhoon, while producing the eye walls of local radial flow and radial outflow alternating distribution; maximum vertical speed and maximum heating center is located biggest cut to the speed of the inside of the main reason for the contraction the the typhoon strengthening process in the eye wall; the moat zone between the eyewall has a strong rotation differences characteristics moat area mainly to weak upward motion, 3 ~ 5km senior distribution of sinking motion; the outer eyewall formation may disseminating information on the mid-level positive potential vorticity contours of bending down to absolute angular momentum, and is conducive to high-level and mid-level exception potential vorticity downstream, and then in the inflow layer convergence to the center of the typhoon. Cumulative inward transport the abnormal potential vorticity in the eyewall outside a radius strengthened under in WISHE mechanisms to develop, eventually forming the outer eyewall. The position may be related to the the lower eyewall bit vortex formed by the outer eyewall the rumor and eye wall potential vorticity encounter within the pass position. Wilma internal region significant interaction, this interaction is closely related with the vertical shear; interested Lower air entering after the formation of the outer eye wall from the wall of the inner eye blocking effect, and but this blocking effect showed significant azimuth selectivity, which may be in close contact with the vertical shear; external eyewall air flows into the outer eyewall from the eye wall of the lower and inner eye wall to play a positive role, and the intrusion of the flow field of high-level environment bring the ventilation foreign eyewall development played a negative role, strongly \obvious interaction, this interaction particles the moat zone in the middle troposphere (~ 7km) the most obvious, is easier with the outer eyewall, the properties of the outer eyewall closer.

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CLC: > Astronomy,Earth Sciences > Atmospheric science (meteorology ) > Synoptic > Journal of Tropical Meteorology
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