Data/hora: 14/06/2024 14:07:19

Provedor de dados: | 5
País: | France
Título: | Zonal variability of plankton and particle export flux in the equatorial Pacific upwelling between 165° E and 150° W
Autores: | Le Borgne, R; Rodier, M; Le Bouteiller, A; Murray, Jw.
Data: | 1999-01
Ano: | 1999
Palavras-chave: | Pacifique équatorial; Variabilité zonale; Plancton; Sédimentation de carbone; Production primaire; Equatorial Pacific; Zonal variations; Plankton; Carbon sinking flux; Primary production.
Resumo: | Observations made during a "La Nina" situation (April-May 1996) in the equatorial Pacific upwelling, between 165 degrees E and 150 degrees W, show the classic deepening of hydrological isolines from east to west, resulting in zonal gradients for surface temperature and macronutrients. However, contrasting with such a gradient, no clear zonal variation could be seen for integrated planktonic biomasses and carbon fluxes, namely: chlorophyll a, bacterial abundances, particulate organic phosphorus, mesozooplankton ash free dry weight, primary production, and the sinking flux of particulate organic carbon (POC). Moreover, mean values of these parameters along the zonal equatorial transect, are not significantly different from those of a 7-day-long time series station made at 0 degrees, 150 degrees W in October 1994 during an El Nine period. Such a steady zonal distribution of planktonic parameters seems to be characteristic of equatorial Pacific upwelling west of the Galapagos Islands so that the spatial distributions of nutrient concentrations and planktonic biomass appear to be uncoupled. This is consistent with the High Nutrient-Low Chlorophyll (HNLC) concept, in which primary production is not controlled directly by macronutrient concentrations. The lack of zonal gradient also suggests that carbon budget of the equatorial Pacific is primarily controlled by oscillations in the zonal and meridian extension of the HNLC area, rather than by values of planktonic biomasses and carbon fluxes within the upwelled water, which are quite constant.
Tipo: | Text
Idioma: | Inglês

Identificador:

http://archimer.ifremer.fr/doc/00325/43629/43254.pdf

DOI:10.1016/S0399-1784(99)80033-4

http://archimer.ifremer.fr/doc/00325/43629/

Editor: | Gauthier-villars/editions Elsevier
Formato: | application/pdf
Fonte: | Oceanologica Acta (0399-1784) (Gauthier-villars/editions Elsevier), 1999-01 , Vol. 22 , N. 1 , P. 57-66

Fonte:

Elsevier, Paris / Ifremer / Cnrs / Ird

info:eu-repo/semantics/openAccess

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