Dissolved organic carbon and apparent oxygen utilization in the Atlantic Ocean

Pan, Xi, Achterberg, Eric, Sanders, Richard, Poulton, Alex, Oliver, Kevin and Robinson, Carol (2014) Dissolved organic carbon and apparent oxygen utilization in the Atlantic Ocean. Deep-Sea Research Part I: Oceanographic Research Papers, 85. pp. 80-87. ISSN 1879-0119

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Abstract

Dissolved organic carbon (DOC distributions along two Atlantic Meridional Transects conducted in 2005 in the region between 47 N and 34 S showed clear latitudinal patterns.The DOC concentrations in the epipelagic zone (0–100m)were the highest (70–90 mM) in tropical and subtropical waters with stable mixed layers, and lowest (50–55 mM)at the poleward extremities of the transects due to deep convective mixing supplying low DOC waters to the surface. A decrease in DOC occurred with depth, and lowest DOC concentrations (41–45 mM) in the 100–300m depth range were observed in the equatorial region due to upwelling of low DOC waters. A strong relationship between DOC and AOU was observed in the s–t 26–26.5 isopycnal layer which underlies the euphotic zone and outcrops at the poleward extremities of the North and South Atlantic Subtropical Gyres (NASG and SASG) in the region ventilating the thermocline waters. Our observations reveal significant north–south variability in the DOC–AOU relationship. The gradient of the relationship suggests that 52%of the AOU in the s–t 26–26.5 density range was driven by DOC degradation in the NASG and 36% in the SASG, with the remainder due to the remineralisation of sinking particulate material. We assess possible causes for the greater contribution of DOC remineralisation in the NASG compared to the SASG.

Item Type: Article
Uncontrolled Keywords: dissolved organic carbon,apparent oxygen utilization,particulate organic carbon,carbon export
Faculty \ School: Faculty of Science > School of Environmental Sciences
Related URLs:
Depositing User: Pure Connector
Date Deposited: 04 Jul 2014 12:53
Last Modified: 20 May 2020 23:55
URI: https://ueaeprints.uea.ac.uk/id/eprint/48989
DOI: 10.1016/j.dsr.2013.12.003

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