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SUMMARY:Tropical Cyclone Motion in the Presence of Surface Discontinuity a
 nd Topography - Johnny Chan (City University of Hong Kong\, Trinity Colleg
 e Cambridge)
DTSTART:20151109T130000Z
DTEND:20151109T140000Z
UID:TALK61539@talks.cam.ac.uk
CONTACT:Doris Allen
DESCRIPTION:In this talk\, the basic physics of tropical cyclone motion wi
 ll first be reviewed. The major part of the talk will focus on how such mo
 vement is modified when a tropical cyclone encounters a surface discontinu
 ity such as when it is about to make landfall. For a flat land that has a 
 much higher friction than that of the ocean\, the cyclone is “attracted
 ” to the region of the highest roughness. Such an attraction can be expl
 ained by examining the various terms of the vorticity equation. In the pre
 sence of topography\, the cyclone can be deflected substantially with some
 times a looping motion. These changes in the cyclone movement result from 
 the variations in the relative contributions by different terms in the pot
 ential vorticity tendency equation. The extent to which such changes occur
  depend on the proximity of the cyclone to the topography\, the size of th
 e cyclone and the background environmental flow.\n\n
LOCATION:MR5\, Centre for Mathematical Sciences
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