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Discussion papers
https://doi.org/10.5194/os-2019-6
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-2019-6
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 15 Feb 2019

Research article | 15 Feb 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Ocean Science (OS).

Factors controlling pCO2 variability in the eastern Gulf of Cádiz (SW Iberian Península)

Dolores Jiménez-López1, Ana Sierra1, Teodora Ortega1, Soledad Garrido2, Nerea Hernández-Puyuelo1, Ricardo Sánchez-Leal3, and Jesús Forja1 Dolores Jiménez-López et al.
  • 1Dpto. Química-Física, INMAR, Facultad de Ciencias del Mar y Ambientales, Universidad de Cádiz, Campus Universitario Río San Pedro, 11510 - Puerto Real, Cádiz, Andalucía, España
  • 2Instituto Español de Oceanografía. Centro Oceanográfico de Murcia. Varadero 1. E-30740, San Pedro del Pinatar, Murcia, España
  • 3Instituto Español de Oceanografía. Centro Oceanográfico de Cádiz. Puerto Pesquero, Muelle de Levante s/n. Apdo. 2609. E-11006, Cádiz, España

Abstract. Spatiotemporal variations of the partial pressure of CO2 (pCO2) were studied during 8 oceanographic cruises conducted between March 2014 and February 2016 in surface waters of the eastern shelf of the Gulf of Cádiz (SW Iberian Península) between the Guadalquivir River and Cape Trafalgar. pCO2 presented a range of variation between 320.6 and 513.6 µatm, with highest values during summer and autumn and lowest during spring and winter, showing a linear dependence between pCO2 and temperature. The distributions of pCO2 were not homogeneous. Spatially, there was a general decrease from coastal to off-shore stations associated with continental inputs and presented an increase in the zones deeper than 400 m due to the influence of the eastward branch of the Azores Current. On the other side, the study area acted as source of CO2 to the atmosphere during summer and autumn and as a sink in spring and winter, with a mean value for the study period of −0.18 ± 1.32 mmol m−2 d−1. In the Guadalquivir and Sancti Petri sections, the CO2 fluxes decreased towards offshore, whereas in the Trafalgar section increased due to the presence of an upwelling. These results highlighted the Gulf of Cádiz as a CO2 sink, with a capture capacity of 14.9 Gg year−1.

Dolores Jiménez-López et al.
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Dolores Jiménez-López et al.
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Short summary
The present study describes the surface distribution of the partial pressure of CO2 in the continental shelf of the eastern Gulf of Cádiz. For this, eight oceanographic cruises were carried out between March 2014 and February 2016. This distribution presents a linear dependence with the temperature and it decreases with distance from the coast. The Gulf of Cádiz acts as a sink of CO2 with a mean value for the study period of −0.18 ± 20 1.32 mmol m−2 d−1.
The present study describes the surface distribution of the partial pressure of CO2 in the...
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