Linking wind and interannual upwelling variability in a regional model of the southern Benguela

Details Linking wind and interannual upwelling variability in a regional model of the southern Benguela Linking wind and interannual upwelling variability in a regional model of the southern Benguela

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29x..41b&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 24, pp. 41-1, CiteID 2188, DOI 10.1029/2002GL015718

Physics

6

Oceanography: General: Continental Shelf Processes, Oceanography: General: Climate And Interannual Variability (3309), Oceanography: General: Numerical Modeling, Oceanography: General: Upwelling And Convergences, Oceanography: Physical: Eastern Boundary Currents

Scientific paper

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.

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