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Steady-state DCM dynamics in Canaries waters.

Tett, Paul, Arístegui, J, Barton, D and Basterretxea, G (2002) Steady-state DCM dynamics in Canaries waters. Deep Sea Research Part II Topical Studies in Oceanography, 49 (17). pp. 3543-3559. ISSN 0967 0645

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Abstract/Description

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 26.4kgm-3 isopycnal. The DFM at these stations occurred at the top of the nitracline, in the presence of 0.3-2M nitrate+nitrite, and at 24h mean isolumes of 10-20Em-2s-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 0.1d-1.

Item Type: Article
Print ISSN: 0967 0645
Electronic ISSN: 1879-0100
Uncontrolled Keywords: Deep chlorophyll maximum; DCM; Deep fluorescence maximum; DFM; Canary Islands; Shallow DFM; Microheterotrophs; Phytoplankton; Ecological Balance; DCM depth steady;
University Divisions/Research Centres: Faculty of Health, Life & Social Sciences > School of Life Sciences
Dewey Decimal Subjects: 500 Science > 550 Earth sciences & geology
500 Science > 570 Life sciences; biology > 577 Ecology
Library of Congress Subjects: Q Science > QH Natural history > QH301 Biology
G Geography. Anthropology. Recreation > GC Oceanography
Item ID: 1690
Depositing User: RAE Import
Date Deposited: 27 Jun 2008 16:51
Last Modified: 20 Aug 2013 11:15
URI: http://researchrepository.napier.ac.uk/id/eprint/1690

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