ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Numerical Simulation of the Impact of Terrain on Landfalling Typhoon Mat sa(2005)
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Abstract:
Using the Penn StateNCAR nonhydrostatic mesoscale model (MM5), the later per iod of landfall of typhoon Matsa is simulated. A lowpass filter is used to sep arate the flow into a larger and a subsynoptic scale component. Then the sub synoptic scale features of Matsa were investigated based on movable coordinate. From the view of the effect of terrain on the interactions between two scales, t he influence of terrain on tropical cyclone is proved to be nonnegligible furt her. The results are as follows: The existence of terrain helps to maintain the intens ity of tropical cyclone and the effect intensifies with the minishing of distanc e between the corner of cyclone and terrain. The intensification is more evident at upper troposphere. At low level the subsynoptic system converts smaller kinetic energy into tropical cyclone and gets more kinetic energy from tro pical cyclone if terrain is taken out. Meanwhile, the su bsynoptic system gets more positive vertical vorticity from tropical cyclone. In a word, tropical cyclone dos not get but losses positive vertical vorticity i f without terrain.
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