Physics
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusm.a51c..02z&link_type=abstract
American Geophysical Union, Spring Meeting 2004, abstract #A51C-02
Physics
1610 Atmosphere (0315, 0325), 3329 Mesoscale Meteorology, 3332 Mesospheric Dynamics, 3339 Ocean/Atmosphere Interactions (0312, 4504), 4504 Air/Sea Interactions (0312)
Scientific paper
From statistical studies, when tropical cyclones move polarward it is a relatively common phenomenon that they undergo transformation to become an extratropical system accompanied by the second re-intensification stage, in which the transformed tropical cyclone either dissipates or else re-intensifies, if the mid-latitude circulation structure is favorable for extratropical cyclogenesis. What makes Juan an interesting and special case is when it moves to the North Atlantic extratropical area it does not undergo this kind of process. Rather, it retains a strong tropical storm structure with a tight inner core, according to visible and infrared satellite imagery. Certainly the warmer-than-normal sea surface temperature during late September 2003 between the Gulf Stream and the Nova Scotia coast is one important responsible factor. But it is not the whole story. What is the structure of the mid-latitude environment and how does it contribute to Juan's evolution? Hurricane Juan made landfall near Halifax, Nova Scotia at 0300 UTC 29 September, as a category 2 hurricane (Saffir-Simpson scale), with maximum sustained winds near 44 m/s. Usually a landfalling hurricane would rapidly decay, and Juan was no exception, with observed SLP filling rapidly to 982 mb by 0600 UTC. This is about 9 mb within 3 hours. Our study attempts to simulate Juan, in its development and propagation to an extratropical area, while maintaining a strong tropical storm structure. We use a tropical bogus vortex scheme, to provide the initial fields. Special attention will be given to the structural evolution, especially at the moment when Juan made landfall and subsequent mechanism of its rapid decay after landing.
Perrie Will
Zhang Wanchuan
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