%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Bachelery, M. L.
%A Illig, Serena
%A Dadou, I.
%T Forcings of nutrient, oxygen, and primary production interannual variability in the southeast Atlantic Ocean
%D 2016
%L fdi:010068227
%G ENG
%J Geophysical Research Letters
%@ 0094-8276
%K biogeochemical cycles ; Benguela Upwelling System ; remote equatorial forcing ; interannual variability ; primary production
%K ANGOLA ; NAMIBIE ; ATLANTIQUE ; BENGUELA COURANT
%M ISI:000384443800034
%N 16
%P 8617-8625
%R 10.1002/2016gl070288
%U https://www.documentation.ird.fr/hor/fdi:010068227
%> https://www.documentation.ird.fr/intranet/publi/2016/11/010068227.pdf
%V 43
%W Horizon (IRD)
%X The recurrent occurrences of interannual warm and cold events along the coast of Africa have been intensively studied because of their striking effects on climate and fisheries. Using sensitivity experimentation based on a coupled physical/biogeochemical model, we show that the oceanic remote equatorial forcing explains more than 85% of coastal interannual nitrate and oxygen fluctuations along the Angolan and Namibian coasts up to the Benguela Upwelling System (BUS). These events, associated with poleward propagations of upwelling and downwelling Coastal Trapped Waves (CTW), are maximum in subsurface and controlled by physical advection processes. Surprisingly, an abrupt change in the CTW biogeochemical signature is observed in the BUS, associated with mixed vertical gradients due to the strong local upwelling dynamics. Coastal modifications of biogeochemical features result in significant primary production variations that may affect fisheries habitats and coastal biodiversity along the southwestern African coasts and in the BUS.
%$ 032 ; 036