Modeling interaction of a tropical cyclone with its cold wake

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Author
Chen, Sue
Elsberry, Russell L.
Harr, Patrick A.
Date
2017-12Metadata
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This study first examines the tropical cyclone (TC) intensity response to its cold wake with time-invariant,
stationary cold wakes and an uncoupled version of COAMPS-TC, and second with simulated cold wakes from
the fully coupled version. The objective of the uncoupled simulations with the time-invariant cold wake is to
fix the thermodynamic response and to isolate the dynamic response of the TC to the cold wake. While the
stationary TC over a cold wake has an immediate intensity decrease, the intensity decrease with a long trailing
wake from the moving TC was delayed. This time delay is attributed to a ‘‘wake jet’’ that leads to an enhanced
inward transport of moist air that tends to offset the effect of decreasing enthalpy flux from the ocean. In the
fully coupled version, the TC translating at ¯¹ generated a long trailing cold wake, and again the intensity
decrease was delayed. Lagrangian trajectories released behind the TC center at four times illustrate the
inward deflection and ascent and descent as the air parcels cross the trailing cold wake. The momentum
budget analysis indicates large radial and tangential wind tendencies primarily due to imbalances among the
pressure gradient force, the Coriolis, and the horizontal advection as the parcels pass over the cold wake.
Nevertheless, a steadily increasing radial inflow (wake jet) is simulated in the region of a positive moisture
anomaly that tends to offset the thermodynamic effect of decreasing enthalpy flux.
Description
Manuscript received 19 August 2016, in final form 25 August 2017
The article of record as published may be located at http://doi.org/10.1175/JAS-D-16-0246.1
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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