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Regional variations in the influence of mesoscale eddies on near-surface chlorophyll

Citation

Gaube, P and McGillicuddy, DJ and Chelton, DB and Behrenfeld, MJ and Strutton, PG, Regional variations in the influence of mesoscale eddies on near-surface chlorophyll, Journal of Geophysical Research: Oceans, 119, (12) pp. 8195-8220. ISSN 2169-9275 (2014) [Refereed Article]

Copyright Statement

Copyright 2014 American Geophysical Union

DOI: doi:10.1002/2014JC010111

Abstract

Eddies can influence biogeochemical cycles through a variety of mechanisms, including the excitation of vertical velocities and the horizontal advection of nutrients and ecosystems, both around the eddy periphery by rotational currents and by the trapping of fluid and subsequent transport by the eddy. In this study, we present an analysis of the influence of mesoscale ocean eddies on near-surface chlorophyll (CHL) estimated from satellite measurements of ocean color. The influences of horizontal advection, trapping, and upwelling/downwelling on CHL are analyzed in an eddy-centric frame of reference by collocating satellite observations to eddy interiors, as defined by their sea surface height signatures. The influence of mesoscale eddies on CHL varies regionally. In most boundary current regions, cyclonic eddies exhibit positive CHL anomalies and anticyclonic eddies contain negative CHL anomalies. In the interior of the South Indian Ocean, however, the opposite occurs. The various mechanisms by which eddies can influence phytoplankton communities are summarized and regions where the observed CHL response to eddies is consistent with one or more of the mechanisms are discussed. This study does not attempt to link the observed regional variability definitively to any particular mechanism but provides a global overview of how eddies influence CHL anomalies.

Item Details

Item Type:Refereed Article
Keywords:mesoscale eddies, satellite observations, physical-biological interaction
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical Oceanography
Objective Division:Environment
Objective Group:Ecosystem Assessment and Management
Objective Field:Ecosystem Assessment and Management of Marine Environments
Author:Strutton, PG (Associate Professor Peter Strutton)
ID Code:99079
Year Published:2014
Web of Science® Times Cited:41
Deposited By:IMAS Research and Education Centre
Deposited On:2015-03-12
Last Modified:2017-11-01
Downloads:0

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