Steady-state DCM dynamics in Canaries waters

被引:16
|
作者
Tett, P [1 ]
Arístegui, J
Barton, D
Basterretxea, G
De Armas, JD
Escánez, JE
León, SH
Lorenzo, LM
Montero, N
机构
[1] Napier Polytech, Sch Life Sci, Edinburgh EH10 5DT, Midlothian, Scotland
[2] Univ Las Palmas Gran Canaria, Dept Biol, Las Palmas Gran Canaria 35017, Spain
[3] Univ Wales, Sch Ocean Sci, Menai Bridge LL59 5EY, Gwynedd, Wales
[4] Inst Espanol Oceanog, Tenerife 38180, Spain
[5] Inst Invest Marinas Punta Betin, Vigo 36208, Spain
关键词
D O I
10.1016/S0967-0645(02)00097-8
中图分类号
P7 [海洋学];
学科分类号
0707 ;
摘要
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 0.3-2muM nitrate + nitrite, and at 24h mean isolumes of 10-20 muEm(-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). (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:3543 / 3559
页数:17
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