Turbulence as a driver for vertical plankton distribution in the subsurface upper ocean

Vertical distributions of turbulent energy dissipation rates and fluorescence were measured simultaneously with a high-resolution micro-profiler in four different oceanographic regions, from temperate to polar and from coastal to open waters settings. High fluorescence values, forming a deep chlorop...

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Bibliographic Details
Published in:Scientia marina 2013-12, Vol.77 (4), p.541-549
Main Authors: Macías, Diego, Rodríguez-Santana, Ángel, Ramírez-Romero, Eduardo, Bruno, Miguel, Pelegrí, Josep L., Sangrà, Pablo, Aguiar-González, Borja, García, Carlos M.
Format: Article
Language:English
Subjects:
deep chlorophyll maximum
Marine
turbulence
vertical plankton distribution
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Summary:Vertical distributions of turbulent energy dissipation rates and fluorescence were measured simultaneously with a high-resolution micro-profiler in four different oceanographic regions, from temperate to polar and from coastal to open waters settings. High fluorescence values, forming a deep chlorophyll maximum (DCM), were often located in weakly stratified portions of the upper water column, just below layers with maximum levels of turbulent energy dissipation rate. In the vicinity of the DCM, a significant negative relationship between fluorescence and turbulent energy dissipation rate was found. We discuss the mechanisms that may explain the observed patterns of planktonic biomass distribution within the ocean mixed layer, including a vertically variable diffusion coefficient and the alteration of the cells' sinking velocity by turbulent motion. These findings provide further insight into the processes controlling the vertical distribution of the pelagic community and position of the DCM.
ISSN:0214-8358
1886-8134
DOI:10.3989/scimar.03854.03A