Modeling the structure and variability of the southern Benguela upwelling using QuikSCAT wind forcing - art. no. C07018
|Author(s)||Blanke Bruno1, 2, 6, Speich Sabrina1, 2, 7, Bentamy Abderrahim1, 3, Roy Claude4, Sow Bamol5|
|Affiliation(s)||1 : Univ Bretagne Occidentale, Inst Francais Rech Exploitat Mer, Lab Phys Oceans, CNRS,UMR 6523, F-29238 Brest, France.
2 : Inst Rech Dev, Paris, France.
3 : Inst Francais Rech Exploitat Mer, F-29280 Plouzane, France.
4 : Inst Rech Dev, Ctr Brest, F-29280 Plouzane, France.
5 : Univ Cheikh Anta Diop, Lab Phys Atmosphere Simeon Fongang, Dakar, Senegal.
|Source||Journal of Geophysical Union - Research C - Oceans (0148-0227) (American Geophysical Union), 2005-07 , Vol. 110 , N. C7 , P. NIL_1-NIL_18|
|WOS© Times Cited||32|
|Keyword(s)||High resolution model, Ai sea interaction, Coastal upwelling|
|Abstract||The structure and patterns of variability of the southern Benguela coastal upwelling system are investigated with a high-resolution regional model forced by QuikSCAT winds over 1999-2003. The relevance of this global wind product is tested, at first, for the specific nearshore southeast Atlantic; then, the wind products are spatially or temporally degraded from the original 0.5 degrees daily fluxes and are used to diagnose the main scales of the surface dynamical forcing variability. Time resolution appears as a crucial factor in the wind stress to retrieve the patterns of interannual anomalies in sea surface temperatures in a good agreement with independent NASA Pathfinder observations. Various upwelling indices are also calculated in the model to study specific warm or cold coastal events whose circulation schemes are detailed from a Lagrangian interpretation of the model time-varying three-dimensional velocity field. Our study emphasizes the connections established between the Benguela upwelling and the large-scale circulation in relation with, for instance, the Agulhas Current retroflection and associated ring shedding.|