Séminaire : Ping Chang (Department of Oceanography, Texas A&M (USA)): Benguela Low-Level Coastal Jet and Warm SST Bias in Climate Models
Wednesday 29 May 2019, 11:00am - 12:00pm
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Abstract : The Benguela Low-Level Coastal Jet (BLLCJ) is one of the atmospheric LLCJs that form along eastern boundary upwelling regions of the world ocean. These narrow equatorward flowing atmospheric jets can give rise to strong wind stress curls in the coastal regions. BLLCJ is unique that it has two near-shore maxima, one near the Angola-Benguela front at 16°–18°S, and the other near the Lüderitz upwelling region at 26°–28°S. By conducting a series of atmospheric model simulations, we show that the fine spatial structure of the BLLCJ is related to the convex geometry of southern Africa’s coastline. We then conducted a series of ocean model simulations to show that resolving the fine spatial structure of the BLLCJ is critical to reduce the warm SST bias in the Benguela upwelling region. A detailed analysis shows that the wind stress curl associated with the double-cored BLLCJ plays a vital role in the coastal circulation of the region. This leads to a central hypothesis of this research that resolving atmospheric low-level jets along the eastern boundaries, and the associated wind stress curl, is critical to improve the warm SST biases along eastern boundary upwelling regions in climate models.
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Location salle de réunion LOCEAN, tour 45/55, 4eme étage



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