Primary production and respiration balance in the upwelling-canary CTZ regionReport as inadecuate

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Materias : BiologíaProductividad primariaÁreas de afloramientoCanarias

Fecha de publicación : 1998

Fecha de depósito: 8-oct-2009

Tipo de documento: Congresos y conferencias

En : Taller y Tertulia en Oceanografía : una visión interdisciplinar de la Oceanografía, Las Palmas de Gran Canaria, 2-7 de Noviembre de 1998 - editores A. W. Ratsimandresy, A. Marrero Díaz, J. P. Pelegrí, I. Laiz Alonso, S. Menvielle, pp. 15-16

Author: Aristegui, J.



Primary Production and Respiration Balance in the Upwelling-Canary CTZ Region Javier Arístegui Ruiz Departamento de Biología Universidad deLas Palmas de Gran Canaria The region of the Canary Islands intersects the boundary behveen eutrophic African upwelling waters and oligotrophic oceanic waters.
This transition zone constitutes an area of high spatial and temporal variability.
Together with the seasonal fluctuations of the coastal upwelling and the variability of the open ocean processes, the islands introduce l a g e spatial variability in the region by disrupting the flow of the Canary Current. Average p r i m ~ yproduction values measured in the region range from 2 gC m-2 day- in the coastal u welling to 0.05-0.3 gC day- in open ocean waters (although values up to 1 gC m- day- are observed associated with mesoscale features, like eddies or fronts).
Primary production computed from the monthly mean near-surface ch!~rnphyU I;,e!ds et and ned by thv CZCS rudiomuter ZIC!from v m s t m t ph~t~syuthetic parameters from PI curves yield similar results. P Seasonal mean values of community respiration integrated in the upper 150 m of the Canary region range from 0.6 to 3 gC m-2 day-.
Although the balance between primary production and respiration varies in relation to different factors like seasonality and distance to the coastal upwelling, in general, integrated respiration is several times higher than the integrated primary production.
The excess of respiration over production found in the Canary region during the year is in al1 cases higher than the unbalance found in the Central North Atlantic during early autumn. Two main mechanisms are proposed to explain the high respiration in this region. First, filaments of cold, chlorophyll-rich water extend several hundreds of krns from the upwelling into the Canary archipelago, transporting particulate and dissolved organic matter, which is respired by the heterotrophic microbial community.
Second, recurrent cyclonic ...

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