FN Archimer Export Format
PT J
TI Spatial variability in autumnal equatorial upwelling intensity within the Gulf of Guinea as inferred from in situ measurements
BT 
AF Nubi, O. A.
   Oyatola, O.O
   Bonou, F
AS 1:1;2:1;3:2,3;
FF 1:;2:;3:;
C1 Nigerian Institute for Oceanography and Marine Research, Lagos, Nigeria.
   Institut de Recherches Halieutiques et Océanologique du Benin, (IRHOB), Cotonou-Bénin.
   Université Nationale des Sciences, Technologie, Ingénierie et Mathématiques(UNSTIM), Cotonou-Bénin
C2 NIOMR, NIGERIA
   IRHOB, BENIN
   UNSTIM, BENIN
TC 0
UR https://archimer.ifremer.fr/doc/00621/73318/72485.pdf
LA English
DT Article
CR EGEE/6
   PIRATA
BO Antea
DE ;Vertical mixing;zonal advection;equatorial undercurrent;equatorial upwelling;Gulf of Guinea;nutrients;phytoplankton biomass;surface enrichment.
AB In attempt to study the spatial differences in autumnal equatorial upwelling intensity relative to bio-productivity in the eastern equatorial Atlantic, oceanographic in situ data along regions 10°W, 0°E, 2.5°E and 6°E, collected in the Gulf of Guinea during autumn cruise carried out in September 2007 were analyzed. The surface mean values for temperature along 10°W, 0°E, 2.5°E and 6°E are 25.02, 26.15, 26.88 and 25.60°C, respectively. There was eastward weakening of the equatorial undercurrent from 10°W until its complete disappearance at 6°E. The highest concentration of nitrate recorded at the surface at 10°W was attributed to the shoaling pycnocline observed at this region. The surface mean values for nitrate along 10°W, 0°E, 2.5°E and 6°E are 0.37, 0.09, 0.04 and 0.04 μmol.kg-1, respectively. In response to the shoaling pycnocline at 10°W, corresponding to the highest concentration of chlorophyll fluorescence was recorded at this region. The surface mean values for chlorophyll fluorescence along 10°W, 0°E, 2.5°E and 6°E are 0.34, 0.05, 0.07 and 0.08 mg/m3, respectively. Contributions to equatorial upwelling by the equatorial undercurrent were the strongest and mostly expressed along 10°W. Profiles for apparent oxygen utilization and chlorophyll fluorescence gave indications that biological response to surface enrichments within the equatorial bands was highest at region 10°W. Vertical sections for studied parameters were unsuggestive of westward advection from 6°E to 10°W within the equatorial band, and this signifies the important role of vertical processes in equatorial enrichment at 10°W during boreal autumn. 
PY 2019
PD MAR
SO Journal of Oceanography and Marine Science
SN 2141-2294
PU Academic Journals
VL 10
IS 1
BP 1
EP 10
DI 10.5897/JOMS2018.0146
ID 73318
ER

EF