Publications des scientifiques de l'IRD

Bachelery M. L., Illig Serena, Dadou I. (2016). Forcings of nutrient, oxygen, and primary production interannual variability in the southeast Atlantic Ocean. Geophysical Research Letters, 43 (16), p. 8617-8625. ISSN 0094-8276.

Titre du document
Forcings of nutrient, oxygen, and primary production interannual variability in the southeast Atlantic Ocean
Année de publication
2016
Type de document
Article référencé dans le Web of Science WOS:000384443800034
Auteurs
Bachelery M. L., Illig Serena, Dadou I.
Source
Geophysical Research Letters, 2016, 43 (16), p. 8617-8625 ISSN 0094-8276
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.
Plan de classement
Limnologie physique / Océanographie physique [032] ; Ecologie, systèmes aquatiques [036]
Description Géographique
ANGOLA ; NAMIBIE ; ATLANTIQUE ; BENGUELA COURANT
Localisation
Fonds IRD [F B010068227]
Identifiant IRD
fdi:010068227
Contact