FN Archimer Export Format
PT J
TI Remotely forced biweekly deep oscillations on the continental slope of the Gulf of Guinea
BT 
AF GUIAVARC'H, Catherine
   TREGUIER, Anne-Marie
   VANGRIESHEIM, Annick
AS 1:1,3;2:1,3;3:2;
FF 1:;2:;3:PDG-DOP-DCB-EEP-LEP;
C1 IFREMER, Lab Phys Oceans, Plouzane, France.
   IFREMER, Lab Environm Profond, Plouzane, France.
C2 IFREMER, FRANCE
   IFREMER, FRANCE
   CNRS, FRANCE
SI BREST
SE PDG-DOP-DCB-OPS-LPO
   PDG-DOP-DCB-EEP-LEP
IN WOS Ifremer jusqu'en 2018
   copubli-france
IF 3.147
TC 12
UR https://archimer.ifremer.fr/doc/2008/publication-4476.pdf
LA English
DT Article
CR BIOZAIRE 1
BO Unknown
DE ;Gulf of Guinea;numerical modeling;Coastal trapped waves
AB Current meter measurements on the continental slope of the Gulf of Guinea (at 7 degrees 20'S and 1300 m depth) have revealed biweekly oscillations of the currents, bottom intensified and oriented along the bathymetry. We develop a three-dimensional primitive equation model of the Gulf of Guinea to study the oscillations and their forcing mechanism. The high resolution (1/12 degrees) regional model reproduces remarkably well the main characteristics of the deep currents on the continental slope. Experiments with different forcings demonstrate that the biweekly variability at 1300 m depth is remotely forced by equatorial winds. Deep Yanai waves generated by the wind propagate eastward along the equator. Upon reaching the African coast, the energy propagates poleward in both directions as coastal trapped waves. The selection of the dominant biweekly period is explained by the absence of equatorial waves with westward group velocities in that frequency band. Contrary to a previous hypothesis involving tidal forcing, our interpretation is coherent with the significant interannual variability of the biweekly energy.
PY 2008
PD JUL
SO Journal of Geophysical Research ( JGR ) - Oceans
SN 0148-0227
PU American Geophysical Union
VL 113
IS C06002
UT 000256563400001
DI 10.1029/2007JC004471
ID 4476
ER

EF