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

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.

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Spatio-temporal variability of the dissolved organic carbon and nitrogen in a coastal area affected by river input: The north eastern shelf of the Gulf of Cádiz (SW Iberian Peninsula)

Marine Chemistry ◽

10.1016/j.marchem.2011.07.003 ◽

2011 ◽

Vol 126 (1-4) ◽

pp. 295-308 ◽

Cited By ~ 15

Author(s):

Mariana Ribas-Ribas ◽

Abelardo Gómez-Parra ◽

Jesús M. Forja

Keyword(s):

Organic Carbon ◽

Iberian Peninsula ◽

Coastal Area ◽

Temporal Variability ◽

Carbon And Nitrogen ◽

River Input ◽

The North ◽

North Eastern ◽

Eastern Shelf ◽

Spatio Temporal

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Distribution of N 2 O in the eastern shelf of the Gulf of Cadiz (SW Iberian Peninsula)

The Science of The Total Environment ◽

10.1016/j.scitotenv.2017.03.189 ◽

2017 ◽

Vol 593-594 ◽

pp. 796-808 ◽

Cited By ~ 5

Author(s):

A. Sierra ◽

D. Jiménez-López ◽

T. Ortega ◽

R. Ponce ◽

M.J. Bellanco ◽

...

Keyword(s):

Iberian Peninsula ◽

Gulf Of Cadiz ◽

Gulf Of Cádiz ◽

Eastern Shelf

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pCO2 variability in the surface waters of the eastern Gulf of Cádiz (SW Iberian Peninsula)

Ocean Science ◽

10.5194/os-15-1225-2019 ◽

2019 ◽

Vol 15 (5) ◽

pp. 1225-1245 ◽

Cited By ~ 1

Author(s):

Dolores Jiménez-López ◽

Ana Sierra ◽

Teodora Ortega ◽

Soledad Garrido ◽

Nerea Hernández-Puyuelo ◽

...

Keyword(s):

Iberian Peninsula ◽

Surface Waters ◽

Temporal Variations ◽

Mean Value ◽

Gulf Of Cadiz ◽

Partial Pressure Of Co2 ◽

Gulf Of Cádiz ◽

Eastern Shelf ◽

Spatio Temporal ◽

Guadalquivir River

Abstract. Spatio-temporal variations in the partial pressure of CO2 (pCO2) were studied during eight oceanographic cruises conducted between March 2014 and February 2016 in surface waters of the eastern shelf of the Gulf of Cádiz (SW Iberian Peninsula) between the Guadalquivir river and Cape Trafalgar. pCO2 presents a range of variation between 320.6 and 513.6 µatm with highest values during summer and autumn and lowest during spring and winter. For the whole study, pCO2 shows a linear dependence with temperature, and spatially there is a general decrease from coastal to offshore stations associated with continental inputs and an increase in the zones deeper than 400 m related to the influence of the eastward branch of the Azores Current. The study area acts as a 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 transects, the CO2 fluxes decrease towards offshore, whereas in the Trafalgar transect fluxes increase due to the presence of an upwelling. The annual uptake capacity of CO2 in the Gulf of Cádiz is 4.1 Gg C yr−1.

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