Modification of the loop current warm core eddy by Hurricane Gilbert (1988)

Numerical investigation of Hurricane Gilbert (1988) effect on the Loop Current warm core eddy (WCE) in the Gulf of Mexico is performed using the Modular Ocean Model version 2 (MOM2). Results show that the storm-induced maximum sea surface temperature (SST) decrease in Gilbert’s wake is over 2.5°C, a...

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Bibliographic Details
Published in:Natural hazards (Dordrecht) 2007-06, Vol.41 (3), p.501-514
Main Authors: Hong, Xiaodong, Chang, Simon W, Raman, Sethu
Format: Article
Language:English
Subjects:
Current reversal
Direction
Eddy currents
Hurricanes
Inertial oscillations
Loop Current
Marine
Meteorology
Mixed layer
Ocean models
Oceanography
Oceans
Sea surface
Sea surface temperature
Simulation
Storms
Surface temperature
Thermocline
Wind stress
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Summary:Numerical investigation of Hurricane Gilbert (1988) effect on the Loop Current warm core eddy (WCE) in the Gulf of Mexico is performed using the Modular Ocean Model version 2 (MOM2). Results show that the storm-induced maximum sea surface temperature (SST) decrease in Gilbert’s wake is over 2.5°C, as compared with the 3.5°C cooling in the absence of the WCE. The near-inertial oscillation in the wake reduces significantly in an along-track direction with the presence of the WCE. This effect is also reflected between the mixed layer and the thermocline, where the current directions are reversed with the upper layer. After two inertial periods (IP), the current reversal is much less obvious. In addition, it is demonstrated that Hurricane Gilbert wind stress increases the current speed of the WCE by approximate 133%. With the forcing of Gilbert, the simulated translation direction and speed of the WCE towards the Mexican coast are closer to the observed (42% more accurate in distance and 78% more accurate in direction) compared with the simulation without the Gilbert forcing. The simulated ocean response to Gilbert generally agrees with the recent observations in Hurricane Fabian.
ISSN:0921-030X
1573-0840
DOI:10.1007/s11069-006-9057-2