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Distribution of dissolved organic nutrients and their effect on export production over the Atlantic Ocean

Record type: Article

A synthesis is provided of dissolved organic nitrogen (DON) and phosphorus (DOP) distributions over the Atlantic Ocean based upon field data from eight recent transects, six meridional between 50°N and 50°S and two zonal at 24° and 36°N. Over the entire tropical and subtropical Atlantic, DON and DOP provide the dominant contributions to total nitrogen and phosphorus pools for surface waters above the thermocline. Elevated DON and DOP concentrations (>5 and >0.2 ?mol L?1, respectively) occur in surface waters on the eastern side of the North Atlantic subtropical gyre and equatorial sides of both the North and South Atlantic subtropical gyres, while particularly low concentrations of DOP (<0.05 ?mol L?1) occur over the northern flank of the North Atlantic subtropical gyre along 36°N. This distribution is consistent with organic nutrients formed at the gyre margins supporting carbon export as they are redistributed via the gyre circulation. The effect of DON and DOP transport and cycling on export production is examined in an eddy-permitting, coupled physical and nutrient model integrated for 40 years: organic nutrients are produced in the upwelling zones off North Africa and transferred laterally into the gyre interior, facilitated in part by the mesoscale eddy circulation, as well as fluxed northward from the tropics as part of the overturning circulation. Inputs of semilabile DON and DOP to the tropical and subtropical Atlantic Ocean play an important role in sustaining up to typically 40 and 70% of the modeled particulate N and P export, particularly on the eastern and equatorward sides of the subtropical gyres.

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Citation

Torres-Valdés, S., Roussenov, V.M., Sanders, R., Reynolds, S., Pan, X., Mather, R., Landolfi, A., Wolff, G.A., Achterberg, E.P. and Williams, R.G. (2009) Distribution of dissolved organic nutrients and their effect on export production over the Atlantic Ocean Global Biogeochemical Cycles, 23, GB4019. (doi:10.1029/2008GB003389).

More information

Published date: 2009
Keywords: dissolved organic nutrients, export production, Atlantic Ocean
Organisations: Ocean and Earth Science, National Oceanography Centre,Southampton

Identifiers

Local EPrints ID: 69427
URI: http://eprints.soton.ac.uk/id/eprint/69427
ISSN: 0886-6236
PURE UUID: 48209238-e7ab-4c9b-a3f1-ad5048540c6b

Catalogue record

Date deposited: 03 Nov 2009
Last modified: 19 Jul 2017 00:12

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Contributors

Author: S. Torres-Valdés
Author: V.M. Roussenov
Author: R. Sanders
Author: S. Reynolds
Author: X. Pan
Author: R. Mather
Author: A. Landolfi
Author: G.A. Wolff
Author: E.P. Achterberg
Author: R.G. Williams

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