Linking wind and interannual upwelling variability in a regional model of the southern Benguela - art. no. 2188
|Author(s)||Blanke Bruno, Roy Claude, Penven Pierrick, Speich Sabrina, McWilliams James, Nelson Greville|
|Affiliation(s)||Univ Cape Town, Dept Oceanog, Idyle BEPV Grp, ZA-7701 Rondebosch, South Africa.
IRD, Paris, France.
Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA.
Marine & Coastal Management, Idyle BEPV Grp, ZA-8012 Cape Town, Cape Town, South Africa.
UBO, IFREMER, CNRS,UMR 6523, LPO, Brest, France.
|Source||Geophysical Research Letters (0094-8276) (AGU), 2002-12 , Vol. 29 , N. 24 , P. NIL_9-NIL_12|
|WOS© Times Cited||26|
|Keyword(s)||Numerical simulation, Wind fluctuation, Sea surface temperature, Upwelling|
|Abstract||We quantify the wind contribution to the development of interannual sea surface temperature (SST) anomalies along the shelf of southern Africa. We compare numerical simulations that differ only in the amount of variability kept in the ERS1/2-derived surface wind forcing. Surprisingly, most of the cold and warm episodes over the Agulhas Bank are strictly related to local fluctuations of the forcing, whereas the shelf of the west coast extending 400 km north of Cape Columbine is equally sensitive to open-sea wind fluctuations. We diagnose the respective role of mesoscale eddy activity and of low frequency and intra-monthly wind fluctuations in generating interannual SST variability. The fair degree of correlation obtained at a few locations between the model and concomitant observations confirms the interest of a regional numerical tool to study anomalous events in the Benguela system.|