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Air–sea CO2 fluxes in the north-eastern shelf of the Gulf of Cádiz (southwest Iberian Peninsula)

Air–sea CO2 fluxes in the north-eastern shelf of the Gulf of Cádiz (southwest Iberian Peninsula)
Air–sea CO2 fluxes in the north-eastern shelf of the Gulf of Cádiz (southwest Iberian Peninsula)
An intra-annual investigation of the fugacity of CO2 (fCO2) has been conducted in surface waters of the north-eastern shelf of the Gulf of Cádiz (SW Iberian Peninsula) in four cruises made in 2006 and 2007. Intra-annual variability of fCO2 was assessed and is discussed in terms of mixing, temperature and biology. In the study area of the shelf, thermodynamic control over fCO2 predominates from early May to late November, and this is opposite and similar in magnitude to the net biological effect. However, biological control over fCO2 predominates during winter. The results suggest that surface waters in the coastal area are under-saturated with respect to atmospheric CO2 during most of the year; therefore they represent a sink for atmospheric CO2 between November and May (? 1.0 mmol m? 2 day? 1), but a weak source in June (1.3 mmol m? 2 day? 1). In contrast, the coastal ecosystems studied (the lower estuary of Guadalquivir Estuary and Bay of Cádiz) acted as a weak sink for atmospheric CO2 during February (? 1.3 mmol m? 2 day? 1) and as a source between May and November (2.6 mmol m? 2 day? 1). The resulting mean annual CO2 flux in the north-eastern shelf of the Gulf of Cádiz was ? 0.07 mol m? 2 year? 1 (? 0.2 mmol m? 2 day? 1), indicating that the area acts as a net sink on an annual basis.
carbon dioxide, INTRA-annual variations, Air–water exchange, Spain, Gulf of Cádiz, 36.9°N–36.3°N, 6.9°W–6.2°W
0304-4203
56-66
Ribas-Ribas, Mariana
85a1f816-cfbd-4a9d-83ff-28611827edcd
Gómez-Parra, Abelardo
2785c838-2dad-41c4-b67d-1a4f1ef58c51
Forja, Jesús M.
a2898b41-1e84-47eb-8b4c-9f903921c156
Ribas-Ribas, Mariana
85a1f816-cfbd-4a9d-83ff-28611827edcd
Gómez-Parra, Abelardo
2785c838-2dad-41c4-b67d-1a4f1ef58c51
Forja, Jesús M.
a2898b41-1e84-47eb-8b4c-9f903921c156

Ribas-Ribas, Mariana, Gómez-Parra, Abelardo and Forja, Jesús M. (2011) Air–sea CO2 fluxes in the north-eastern shelf of the Gulf of Cádiz (southwest Iberian Peninsula). Marine Chemistry, 123 (1-4), 56-66. (doi:10.1016/j.marchem.2010.09.005).

Record type: Article

Abstract

An intra-annual investigation of the fugacity of CO2 (fCO2) has been conducted in surface waters of the north-eastern shelf of the Gulf of Cádiz (SW Iberian Peninsula) in four cruises made in 2006 and 2007. Intra-annual variability of fCO2 was assessed and is discussed in terms of mixing, temperature and biology. In the study area of the shelf, thermodynamic control over fCO2 predominates from early May to late November, and this is opposite and similar in magnitude to the net biological effect. However, biological control over fCO2 predominates during winter. The results suggest that surface waters in the coastal area are under-saturated with respect to atmospheric CO2 during most of the year; therefore they represent a sink for atmospheric CO2 between November and May (? 1.0 mmol m? 2 day? 1), but a weak source in June (1.3 mmol m? 2 day? 1). In contrast, the coastal ecosystems studied (the lower estuary of Guadalquivir Estuary and Bay of Cádiz) acted as a weak sink for atmospheric CO2 during February (? 1.3 mmol m? 2 day? 1) and as a source between May and November (2.6 mmol m? 2 day? 1). The resulting mean annual CO2 flux in the north-eastern shelf of the Gulf of Cádiz was ? 0.07 mol m? 2 year? 1 (? 0.2 mmol m? 2 day? 1), indicating that the area acts as a net sink on an annual basis.

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More information

Published date: 20 January 2011
Keywords: carbon dioxide, INTRA-annual variations, Air–water exchange, Spain, Gulf of Cádiz, 36.9°N–36.3°N, 6.9°W–6.2°W
Organisations: Ocean Biochemistry & Ecosystems

Identifiers

Local EPrints ID: 337370
URI: http://eprints.soton.ac.uk/id/eprint/337370
ISSN: 0304-4203
PURE UUID: 478fde60-1f76-45ea-bc52-c13d53b0b168

Catalogue record

Date deposited: 24 Apr 2012 09:43
Last modified: 16 Jul 2019 22:07

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