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J. Mar. Sci. Eng. 2015, 3(3), 891-905; doi:10.3390/jmse3030891

Ocean-Atmosphere CO2 Fluxes in the North Atlantic Subtropical Gyre: Association with Biochemical and Physical Factors during Spring

1
CACYTMAR, Departamento de Quimica-Fisica, Facultad de Ciencias del Mar y Ambientales, Universidad de Cadiz, Puerto Real, Cadiz 11510, Spain
2
Institute of Marine Sciences of Andalusia (CSIC), Campus Rio San Pedro, s/n 11510, Puerto Real, Cadiz 11510, Spain
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Robert C. Upstill-Goddard
Received: 17 April 2015 / Accepted: 4 August 2015 / Published: 13 August 2015
(This article belongs to the Special Issue Air–Sea Gas Exchange Process and Impact Factors)
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Abstract

Sea surface partial pressure of CO2 (pCO2) was measured continuously in a transect of the North Atlantic subtropical gyre between Santo Domingo, Dominican Republic (18.1° N, 68.5° W) and Vigo, Spain (41.9° N, 11.8° W) during spring 2011. Additional biogeochemical and physical variables measured to identify factors controlling the surface pCO2 were analyzed in discrete samples collected at 16 sites along the transect at the surface and to a depth of 200 m. Sea surface pCO2 varied between 309 and 662 μatm, and showed differences between the western and eastern subtropical gyre. The subtropical gyre acted as a net CO2 sink, with a mean flux of −5.5 ± 2.2 mmol m−2 day−1. The eastern part of the transect, close to the North Atlantic Iberian upwelling off the Galician coast, was a CO2 source with an average flux of 33.5 ± 9.0 mmol m−2 day−1. Our results highlight the importance of making more surface pCO2 observations in the area located east of the Azores Islands since air-sea CO2 fluxes there are poorly studied. View Full-Text
Keywords: CO2 fluxes; surface pCO2; North Atlantic subtropical gyre; upwelling CO2 fluxes; surface pCO2; North Atlantic subtropical gyre; upwelling
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Burgos, M.; Sendra, M.; Ortega, T.; Ponce, R.; Gómez-Parra, A.; Forja, J.M. Ocean-Atmosphere CO2 Fluxes in the North Atlantic Subtropical Gyre: Association with Biochemical and Physical Factors during Spring. J. Mar. Sci. Eng. 2015, 3, 891-905.

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