Mechanisms for vertical nutrient transport within a North Atlantic mesoscale eddy
Martin, A.P. and Richards, K.J. (2001) Mechanisms for vertical nutrient transport within a North Atlantic mesoscale eddy. Deep-Sea Research II, 48, (4-5), 757-773. (doi:10.1016/S0967-0645(00)00096-5).
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Prompted by observational evidence for an enhanced source of surface nutrients within an anticyclonic eddy in the NE Atlantic, we investigate vertical transport processes that may produce such a phenomenon. For the eddy investigated, the dominant mechanism is found to be ageostrophic circulation resulting from a perturbation of the circular flow of the eddy. This can produce upwelling velocities of order 10 md−1. Ekman pumping due to wind stress on the eddy also produces upwelling within, but on a smaller scale of ~0.5 md−1. There is no evidence that self-propagation of the eddy leads to an enhanced nutrient flux by displacement upwards of nutrient-laden deeper isopycnals over the core of the eddy. Deeper winter mixing within the eddy relative to the surroundings, however, may contribute to the elevated nutrient levels.
|Keywords:||OCEAN EDDIES, VERTICAL TRANSPORT, VERTICAL MIGRATIONS, ISOPYCNAL MIXING, NUTRIENTS|
|Subjects:||G Geography. Anthropology. Recreation > GC Oceanography|
|Divisions:||University Structure - Pre August 2011 > School of Ocean & Earth Science (SOC/SOES)
|Date Deposited:||04 Aug 2004|
|Last Modified:||01 Jun 2011 03:40|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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