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Dissolved organic carbon and apparent oxygen utilization in the Atlantic Ocean

Dissolved organic carbon and apparent oxygen utilization in the Atlantic Ocean
Dissolved organic carbon and apparent oxygen utilization in the Atlantic Ocean
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 (0–100 m) were the highest (70–90 µM) in tropical and subtropical waters with stable mixed layers, and lowest (50–55 µM) 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 µM) in the 100–300 m 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 ?–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 ?–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.
0967-0637
80-87
Pan, Xi
ff91c9f9-28c6-465b-a4aa-51b879dbd611
Achterberg, Eric P.
685ce961-8c45-4503-9f03-50f6561202b9
Sanders, Richard
02c163c1-8f5e-49ad-857c-d28f7da66c65
Poulton, Alex J.
14bf64a7-d617-4913-b882-e8495543e717
Oliver, Kevin I.C.
588b11c6-4d0c-4c59-94e2-255688474987
Robinson, Carol
aa5b407d-ce1d-4706-a7ce-e2ee4c832071
Pan, Xi
ff91c9f9-28c6-465b-a4aa-51b879dbd611
Achterberg, Eric P.
685ce961-8c45-4503-9f03-50f6561202b9
Sanders, Richard
02c163c1-8f5e-49ad-857c-d28f7da66c65
Poulton, Alex J.
14bf64a7-d617-4913-b882-e8495543e717
Oliver, Kevin I.C.
588b11c6-4d0c-4c59-94e2-255688474987
Robinson, Carol
aa5b407d-ce1d-4706-a7ce-e2ee4c832071

Pan, Xi, Achterberg, Eric P., Sanders, Richard, Poulton, Alex J., Oliver, Kevin I.C. and Robinson, Carol (2014) Dissolved organic carbon and apparent oxygen utilization in the Atlantic Ocean. Deep Sea Research Part I: Oceanographic Research Papers, 85, 80-87. (doi:10.1016/j.dsr.2013.12.003).

Record type: Article

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 (0–100 m) were the highest (70–90 µM) in tropical and subtropical waters with stable mixed layers, and lowest (50–55 µM) 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 µM) in the 100–300 m 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 ?–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 ?–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.

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Published date: March 2014
Organisations: Ocean and Earth Science, Marine Biogeochemistry, Physical Oceanography

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Local EPrints ID: 362267
URI: http://eprints.soton.ac.uk/id/eprint/362267
ISSN: 0967-0637
PURE UUID: 9a395f3c-5c1e-4838-81a6-d2a541c3a1d7

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Date deposited: 18 Feb 2014 16:51
Last modified: 16 Jul 2019 21:12

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