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Title: Steady-state DCM dynamics in Canaries waters
Authors: Tett, Paul
Arístegui, Javier 
Barton, Des
Basterretxea, Gotzon
De Armas, J. D.
Escánez, José E.
León, Santiago Hernández 
Lorenzo, Luisa M.
Montero, Nandi 
UNESCO Clasification: 251001 Oceanografía biológica
Keywords: Deep Chlorophyll Maximum (DCM) dynamics
Canary islands
Issue Date: 2002
Journal: Deep-Sea Research Part II: Topical Studies in Oceanography 
Abstract: This paper concerns the deep chlorophyll maximum (DCM) dynamics in a steady state, using primarily data from the Canary Islands Area of Filament and Eddy eXchange obtained in August 1999 during a cruise between oligotrophic waters west of La Palma and the north-west African coastal upwelling. CTD-fluorometer observations of the deep fluorescence maximum (DFM) were confirmed by water samples from which chlorophyll was extracted. The DFM–DCM was perturbed at many stations by island-generated eddies and similar features, and the paper focuses on unperturbed stations, which were identified by the occurrence of the DFM close to the 26.4 kg m−3 isopycnal. The DFM at these stations occurred at the top of the nitracline, in the presence of 0.3–2 μM nitrate+nitrite, and at 24 h mean isolumes of 10–20 μE m−2 s−1. The classical compensation depth model predicts the occurrence of the DFM–DCM at less illumination and hence at too great a depth, making it necessary to take into account additional losses, especially those due to the respiration of microheterotrophs in biomass equilibrium with phytoplankton. The depth of the steady-state DCM is compatible with the predictions of a microplankton model, given (i) a ratio of 0.3–0.6 of microheterotroph to total microplankton biomass, and (ii) other losses (due to meszooplankton grazing and vertical mixing) of about 0.1 d−1.
ISSN: 0967-0645
DOI: 10.1016/S0967-0645(02)00097-8
Source: Deep-Sea Research Part II: Topical Studies in Oceanography [ISSN 0967-0645], v. 49 (17), p. 3543-3559
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