FN Archimer Export Format
PT J
TI Role of interannual Kelvin wave propagations in the equatorial Atlantic on the Angola Benguela Current system
BT 
AF KOUNGUE, Rodrigue Anicet Imbol
   ILLIG, Serena
   ROUAULT, Mathieu
AS 1:1,2;2:1,3;3:1,2;
FF 1:;2:;3:;
C1 Univ Cape Town, MARE Inst, Dept Oceanog, Cape Town, South Africa.
   Univ Cape Town, Dept Oceanog, Nansen Tutu Ctr Marine Environm Res, Cape Town, South Africa.
   Univ Toulouse, CNRS, LEGOS, CNES,IRDM,UPS,IRD, Toulouse, France.
C2 UNIV CAPE TOWN, SOUTH AFRICA
   UNIV CAPE TOWN, SOUTH AFRICA
   UNIV TOULOUSE, FRANCE
IF 2.711
TC 28
UR https://archimer.ifremer.fr/doc/00623/73556/73221.pdf
LA English
DT Article
CR PIRATA
AB The link between equatorial Atlantic Ocean variability and the coastal region of Angola-Namibia is investigated at interannual time scales from 1998 to 2012. An index of equatorial Kelvin wave activity is defined based on Prediction and Research Moored Array in the Tropical Atlantic (PIRATA). Along the equator, results show a significant correlation between interannual PIRATA monthly dynamic height anomalies, altimetric monthly Sea Surface Height Anomalies (SSHA), and SSHA calculated with an Ocean Linear Model. This allows us to interpret PIRATA records in terms of equatorial Kelvin waves. Estimated phase speed of eastward propagations from PIRATA equatorial mooring remains in agreement with the linear theory, emphasizing the dominance of the second baroclinic mode. Systematic analysis of all strong interannual equatorial SSHA shows that they precede by 1-2 months extreme interannual Sea Surface Temperature Anomalies along the African coast, which confirms the hypothesis that major warm and cold events in the Angola-Benguela current system are remotely forced by ocean atmosphere interactions in the equatorial Atlantic. Equatorial wave dynamics is at the origin of their developments. Wind anomalies in the Western Equatorial Atlantic force equatorial downwelling and upwelling Kelvin waves that propagate eastward along the equator and then poleward along the African coast triggering extreme warm and cold events, respectively. A proxy index based on linear ocean dynamics appears to be significantly more correlated with coastal variability than an index based on wind variability. Results show a seasonal phasing, with significantly higher correlations between our equatorial index and coastal SSTA in October-April season. 
PY 2017
PD JUL
SO Journal Of Geophysical Research-oceans
SN 2169-9275
PU Amer Geophysical Union
VL 122
IS 6
UT 000407088800012
BP 4685
EP 4703
DI 10.1002/2016JC012463
ID 73556
ER

EF