%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Desbiolles, F.
%A Blanke, B.
%A Bentamy, A.
%A Roy, Claude
%T Response of the Southern Benguela upwelling system to fine-scale modifications of the coastal wind
%D 2016
%L fdi:010066239
%G ENG
%J Journal of Marine Systems
%@ 0924-7963
%K Eastern boundary upwelling system ; Momentum flux forcing ; Wind profile ; Numerical modeling ; Scatterometry
%K AFRIQUE DU SUD ; ATLANTIQUE SUD ; BENGUELA
%M ISI:000370888600004
%P 46-55
%R 10.1016/j.jmarsys.2015.12.002
%U https://www.documentation.ird.fr/hor/fdi:010066239
%> https://www.documentation.ird.fr/intranet/publi/2016/03/010066239.pdf
%V 156
%W Horizon (IRD)
%X We analyze the results of a regional model of the Southern Benguela upwelling system forced by wind stress fields derived from QuikSCAT observations. Two different horizontal resolutions are considered for the wind stress: QS25 and QS50, corresponding to native 25 and 50 km grids, respectively. The differences between both products highlight the primary importance of fine-scale momentum fluxes for both the structure and intensity of the wind- and wind-curl-driven upwelling. Using QS25, we show that the coastal Ekman transport is reduced, leading to a warmer SST and a reduced oceanic coastal jet. QS25 finer wind stress curl patterns also favor the development of a stronger and shallower poleward undercurrent. The addition of a coastal wind correction to QS25 lets us investigate the possible implications of an imbalance between Ekman transport and Ekman pumping: a wind reduction in the coastal band often reduces the SST cooling, but the two mechanisms compensate each other when the characteristic length scales of the coastal upwelling and the orography-induced wind drop-off are similar.
%$ 032 ; 020