| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Spatial variability in autumnal equatorial upwelling intensity within the Gulf of Guinea as inferred from in situ measurements
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| Autores: |
Nubi, O. A.
Oyatola, O.o
Bonou, F
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| Data: |
2019-03
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| Ano: |
2019
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| Palavras-chave: |
Vertical mixing
Zonal advection
Equatorial undercurrent
Equatorial upwelling
Gulf of Guinea
Nutrients
Phytoplankton biomass
Surface enrichment.
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| Resumo: |
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.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
https://archimer.ifremer.fr/doc/00621/73318/72485.pdf
DOI:10.5897/JOMS2018.0146
https://archimer.ifremer.fr/doc/00621/73318/
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| Editor: |
Academic Journals
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| Formato: |
application/pdf
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| Fonte: |
Journal of Oceanography and Marine Science (2141-2294) (Academic Journals), 2019-03 , Vol. 10 , N. 1 , P. 1-10
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| Direitos: |
info:eu-repo/semantics/openAccess
restricted use
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