home icon user icon
Welcome to International Network for Natural Sciences | INNS Pub.
Home My Account
Submit Manuscript
double_slash
breadcumb_bg

Inter-annual variability on the influence of equatorial upwelling on biological productivity along 10oW in the Eastern Equatorial Atlantic (EEA)

Paper Details

Research Paper 01/01/2014
Views (384) Download (16)
current_issue_feature_image
publication_file

Inter-annual variability on the influence of equatorial upwelling on biological productivity along 10oW in the Eastern Equatorial Atlantic (EEA)

O.A. Nubi, B. Bourlès, C.A. Edokpayi, N. Hounkonnou
J. Bio. Env. Sci.4( 1), 72-80, January 2014.
Certificate: JBES 2014 [Generate Certificate]
Key: Biological productivityEastern equatorial AtlanticEquatorial undercurrentEquatorial upwellingNutrients

Abstract

Of the 3 boreal summers covered by the EGEE oceanographic cruises between 2005 and 2007, equatorial upwelling was strongest along 10oW in June 2005 and weakest in June 2006. In response to the shoaling pycnocline, cold nutrient-rich waters upwelled to the euphotic layer and significantly influenced the biological productivity of the region in June 2005. Using profiles for temperature, salinity and dissolved oxygen (at the latitude of Equatorial Under-Current (EUC) velocity core) and chlorophyll fluorescence profile (at the latitude of maximum occurrences within the EUC latitude bands), the hypothesis of the EUC contributing to the equatorial fertility process along 10oW was captured. While nitrate was limiting to phytoplankton growth in June 2006 and June 2007, phosphate stress was observed in June 2005.

VIEWS 13
Cover PDF

Baurand F. 2008. Analyses Report for Nutrient EGEE 1, 2, 3, 4, 5, and 6. US-191 “IMAGO” – Composante océanographique de Brest. IRD Brest.

Benschneider K, Robinson RJ. 1952. A new spectrometric method for determination of nitrite in sea water. Journal of Marine Research. 11, 87–96.

Bourlès B, D’Orgeville M, Eldin G, Gouriou Y, Chuchla R, DuPenhoat Y, Arnault S. 2002. On the evolution of the thermocline and sub-thermocline eastward currents in the Equatorial Atlantic, Geophysical Research Letters 29(16), 1785, doi:10.1029/2002GL015098.

Bourlès B, Marin F, Gouriou Y, Grelet J, Chuchla R, Roubaud F, DuPenhoat Y. 2007. Oceanic measurements carried out in the Gulf of Guinea in 2005-2007 during the EGEE cruises, as part of the French AMMA program: first results; présentation orale pendant la 2nde conférence internationale AMMA de Karlsruhe (Allemagne), associée au meeting AMMA-Océan/PIRATA :TACE-CLIVAR, 26-30 Novembre 2007.

Bonhoure D, Rowe E, Mariano AJ, Ryan EH. 2004.  “The  South  Equatorial  Sys  Current.”  Ocean Surface Currents. (2004). http://oceancurrents.rsmas.miami.edu/atlantic/sout h-equatorial.html.

Gallardo Y. 1993. Les Conditions Oceaniques du Maximum des Pluies Littorales Ivoiriennes en Juin. Office de la Recherche Scientifique et Technique d’Outre-Mer (ORSTOM), Ivory Coast, pp: 63 – 73.

Gillooly M, O’Sullivan G, Kirkwood D, Aminot A. 1992. The establishment of a database for trend monitoring of nutrients in the Irish Sea. Fisheries Research Centre, Dublin (EC Norsap Contract Report No: B6618-89-03)

Grodsky SA, Carton JA. 2002. Surface drifter pathways originating in the equatorial Atlantic cold tongue. Geophysical Research Letters, 29(23), 2147.

Hardman-Mountford NJ. 2000. Environmental variability in the Gulf of Guinea Large Marine Ecosystem: Physical features, forcing and fisheries. PhD Thesis. University of Warwick, UK, www.oikos.warwick.ac.uk/ecosystems/ThesisArchive.

Herbland A, Voituriez B. 1977. Evaluation de la production primaire et de la chlorophylle a partir des données hydrologiques. Scientific Centre for Oceanographic Research, Abidjan. 8, 73-85.

Hisard P. 1973. Variations saisonnières a l’équateur dans le Golfe de Guinée, Cah ORSTOM, sér Océanography. 11, 349-358.

Hormann V, Brandt P. 2007. Atlantic equatorial undercurrent and associated cold tongue variability. Journal of Geophysical Research, 112, C06017.

Jouanno J, Marin F, DuPenhoat Y, Sheinbaum J, Molines JM. 2011. Seasonal heat balance in the upper 100m of the Equatorial Atlantic Ocean, Journal of Geophysical Research, 116, C09003, doi:10.1029/2010JC006912.

Kerr RA. 1999. Atmospheric science — does a globe-girdling disturbance jigger El Nino? Science. 285, 322–323.

Kolodziejczyk N, Bourlès B, Marin F, Grelet J, Chuchla R. 2009. Seasonal variability of the Equatorial Undercurrent at 10oW as inferred from recent in situ observations, Journal of Geophysical Research, 114, C06014, 2009.

Le Borgne R. 1977. Etude de la production pélagique de la zone équatoriale de l’Atlantique á 4oW. II -Biomasses et peuplements du zooplancton. Cah O.R.S.T.O.M., Se’r Océanography. 15, 333-349.

Marin F, Caniaux G, Bourl`es B, Giordani H, Gouriou Y, Key E. 2009. Why were sea surface temperatures so different in the eastern equatorial Atlantic in June 2005 and 2006? Journal of Physical Oceanography 39 1416–1431. DOI:10.1175/2008JPO4030.1.

Molinari RL. 1982. Observations of eastward currents in the tropical South Atlantic Ocean: 1978-1980. Journal of Geophysical Research, 87, 9707-9714.

Murphy J. Riley JP. 1962. A modified single solution method for the determination of phosphate in natural waters. Analytical Chimmie Acta. 27, 31-36.

Oudot C, Morin P. 1987. The distribution of nutrients in the equatorial Atlantic : relàtion to physical processes and phytoplankton biomass. Oceanology Acta, 1987. Proceedings International Symposium on Equatorial Vertical Motion, Paris, 6-10 May 1985, 121-130.

Voituriez B, Dandonneau Y. 1974. Relations entre la structure thermique, la production primaire et la régénération des sels nutritifs dans le dôme de Guinée. Cah. O.R.S.T.O.M., sér. Océanogr., 12(4) : 241-255.

Voituriez B, Herbland A. 1977. Production primaire, nitrate et nitrite dans l’Atlantique tropical. II: Distribution du nitrate et production de nitrite, Cah ORSTOM, sér Océanography. 15, 57-65.

Voituriez B, Herbland A. 1979. The use of the salinity maximum of the equatorial undercurrent for estimating nutrient enrichment and primary production in the Gulf of Guinea, Deep-sea Research. 24, 25-33.

Submit Manuscript