FN Archimer Export Format
PT J
TI Coastal Upwelling Limitation by Onshore Geostrophic Flow in the Gulf of Guinea Around the Niger River Plume
BT 
AF ALORY, Gael
   DA-ALLADA, Casimir Yelognisse
   DJAKOURE, Sandrine
   DADOU, Isabelle
   JOUANNO, Julien
   LOEMBA, Dorelle Prudence
AS 1:1;2:2,3,4;3:5;4:1;5:1;6:2,6;
FF 1:;2:;3:;4:;5:;6:;
C1 LEGOS, CNES/CNRS/IRD/UPS, Toulouse, France
   ICMPA-UNESCO Chair, Univ. Abomey-Calavi, Cotonou, Benin
   LaGEA/ENSTP/UNSTIM, Abomey, Benin
   LHMC/IRHOB, Cotonou, Benin
   LASMES (ex LAPA-MF) Univ. Félix Houphouët-Boigny, Abidjan, Côte d’Ivoire
   IRSEN, Pointe Noire, Rep Congo.
C2 UNIV TOULOUSE, FRANCE
   UNIV ABOMEY CALAVI, BENIN
   UNSTIM, BENIN
   IRHOB, BENIN
   UNIV FELIX HOUPHOUET BOIGNY, COTE IVOIRE
   IRSEN, REP CONGO
IN DOAJ
TC 13
UR https://archimer.ifremer.fr/doc/00882/99404/109435.pdf
LA English
DT Article
CR PIRATA
DE ;coastal upwelling;river plume;Gulf of Guinea;salinity;tropical Atlantic
AB Wind-driven coastal upwelling can be compensated by onshore geostrophic flow, and river plumes are associated with such flow. We investigate possible limitation of the northeast Gulf of Guinea upwelling by the Niger River plume, using regional ocean model simulations with or without river and dynamical upwelling indices. Here, the upwelling is weakened by 50% due to an onshore geostrophic flow equally controlled by alongshore thermosteric and halosteric sea-level changes. The river contributes to only 20% of this flow, as its plume is shallow while upwelling affects coastal temperature and salinity over a larger depth. Moreover, the river-induced mixed-layer thinning compensates the current increase, with no net effect on upwelling. The geostrophic compensation is due to an abrupt change in coastline orientation that creates the upwelling cross-shore front. The river nonetheless warms the upwelling tongue by 1 degrees C, probably due to induced changes in horizontal advection and/or stratification. 
PY 2021
PD JAN
SO Frontiers In Marine Science
PU Frontiers Media Sa
VL 7
UT 000609414100001
DI 10.3389/fmars.2020.607216
ID 99404
ER

EF