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Total organic carbon distribution and budget through the Strait of Gibraltar in April 1998

Total organic carbon distribution and budget through the Strait of Gibraltar in April 1998
Total organic carbon distribution and budget through the Strait of Gibraltar in April 1998
In order to investigate total organic carbon (TOC) exchange through the Strait of Gibraltar, samples were taken along two sections from the western (Gulf of Cádiz) and eastern (Western Alboran Sea) entrances of the Strait and at the middle of the Strait in April 1998. TOC was measured by using a high-temperature catalytic oxidation method. The results referenced here are based on a three-layer model of water mass exchange through the Strait, which includes the Atlantic inflow, Mediterranean outflow and an interface layer in between. All layers were characterised by a decrease of TOC concentrations from the Gulf of Cádiz to the Western Alboran Sea: from 60–79 to 59–66 M C in the Atlantic inflow and from 40–60 to 38–52 M C in the Mediterranean waters, respectively. TOC concentrations in the modified North Atlantic Central Water varied from 43 to 55 M C. Intermediate TOC values were measured in the interface layer (43–60 M C). TOC concentrations increased from the middle of the Strait towards continents indicating a contribution of organic carbon of photosynthetic origin along Spain and Morocco coasts or TOC accumulation due to upwelling in the northeastern part of the Strait. Our results indicate that the short-term variability caused by the tide greatly impacts the TOC distribution, particularly in the Gulf of Cádiz. The TOC input from the Atlantic Ocean to the Mediterranean Sea through the Strait of Gibraltar varies from 0.9×104 to 1.0×104 mol C s?1 (or 0.28×1012 to 0.35×1012 mol C year?1, respectively). This estimate suggests that the TOC inflow and outflow through the Strait of Gibraltar are two and three orders of magnitude higher than reported via the Turkish Straits and Mediterranean River inputs.
WOCE, DISTRIBUTION, CARBON BUDGET, TOTAL ORGANIC CARBON
0304-4203
233-252
Dafner, E.V.
603f4bcc-c6db-4161-bb71-364a3d4871a0
Sempere, R.
d95a27bf-74ad-4fa9-ac6b-805dd7b047b7
Bryden, H.L.
7f823946-34e8-48a3-8bd4-a72d2d749184
Dafner, E.V.
603f4bcc-c6db-4161-bb71-364a3d4871a0
Sempere, R.
d95a27bf-74ad-4fa9-ac6b-805dd7b047b7
Bryden, H.L.
7f823946-34e8-48a3-8bd4-a72d2d749184

Dafner, E.V., Sempere, R. and Bryden, H.L. (2001) Total organic carbon distribution and budget through the Strait of Gibraltar in April 1998. Marine Chemistry, 73 (3-4), 233-252. (doi:10.1016/S0304-4203(00)00109-2).

Record type: Article

Abstract

In order to investigate total organic carbon (TOC) exchange through the Strait of Gibraltar, samples were taken along two sections from the western (Gulf of Cádiz) and eastern (Western Alboran Sea) entrances of the Strait and at the middle of the Strait in April 1998. TOC was measured by using a high-temperature catalytic oxidation method. The results referenced here are based on a three-layer model of water mass exchange through the Strait, which includes the Atlantic inflow, Mediterranean outflow and an interface layer in between. All layers were characterised by a decrease of TOC concentrations from the Gulf of Cádiz to the Western Alboran Sea: from 60–79 to 59–66 M C in the Atlantic inflow and from 40–60 to 38–52 M C in the Mediterranean waters, respectively. TOC concentrations in the modified North Atlantic Central Water varied from 43 to 55 M C. Intermediate TOC values were measured in the interface layer (43–60 M C). TOC concentrations increased from the middle of the Strait towards continents indicating a contribution of organic carbon of photosynthetic origin along Spain and Morocco coasts or TOC accumulation due to upwelling in the northeastern part of the Strait. Our results indicate that the short-term variability caused by the tide greatly impacts the TOC distribution, particularly in the Gulf of Cádiz. The TOC input from the Atlantic Ocean to the Mediterranean Sea through the Strait of Gibraltar varies from 0.9×104 to 1.0×104 mol C s?1 (or 0.28×1012 to 0.35×1012 mol C year?1, respectively). This estimate suggests that the TOC inflow and outflow through the Strait of Gibraltar are two and three orders of magnitude higher than reported via the Turkish Straits and Mediterranean River inputs.

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More information

Published date: 2001
Keywords: WOCE, DISTRIBUTION, CARBON BUDGET, TOTAL ORGANIC CARBON

Identifiers

Local EPrints ID: 8017
URI: https://eprints.soton.ac.uk/id/eprint/8017
ISSN: 0304-4203
PURE UUID: 956fe8c6-8059-4b9e-9dbf-0f257205cbe5
ORCID for H.L. Bryden: ORCID iD orcid.org/0000-0002-8216-6359

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Date deposited: 19 Aug 2004
Last modified: 06 Jun 2018 13:02

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Contributors

Author: E.V. Dafner
Author: R. Sempere
Author: H.L. Bryden ORCID iD

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