Simulating and Understanding the Gap Outflow and Oceanic Response over the Gulf of Tehuantepec During GOTEX
Journal Article - Open Access
NAVAL RESEARCH LAB WASHINGTON DC WASHINGTON United States
Pagination or Media Count:
Tehuantepecer is a strong mountain gap wind traveling through Chivela Pass into eastern Pacific coast in southern Mexico, most commonly between October and February and brings huge impacts on local and surrounding meteorology and oceanography. Gulf of Tehuantepec EXperiment GOTEX was conducted in February 2004 to enhance the understanding of the strong offshore gap wind, ocean cooling, vertical circulations and interactions among them. The gap wind event during GOTEX was simulated using the U.S. Navy Coupled OceanAtmosphere Mesoscale Prediction System COAMPS R. The simulations are compared and validated with the observations retrieved from several satellites GOES 10-12, MODISAquaTerra, TMI, and QuikSCAT and Airborne EXpendable BathyThermograph AXBT. The study shows that the gap wind outflow has a fanlike pattern expending from the coast and with a strong diurnal variability. The surface wind stress and cooling along the axis of the gap wind outflow caused intense upwelling and vertical mixing in the upper ocean both contributed to the cooling of the ocean mixed layer under the gap wind. The cooling pattern of sea surface temperature SST also reflects temperature advection by the nearby ocean eddies to have a crescent shape.
- Physical and Dynamic Oceanography