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Biogeosciences An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/bg-2020-232
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2020-232
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  03 Aug 2020

03 Aug 2020

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This preprint is currently under review for the journal BG.

Chemical characterization of Punta de Fuencaliente CO2 seeps system (La Palma Island, NE Atlantic Ocean): a new natural laboratory for ocean acidification studies

Sara González-Delgado1, David González-Santana2,3, Magdalena Santana-Casiano2, Melchor González-Dávila2, Celso A. Hernández1, Carlos Sangil1, and José Carlos Hernández1 Sara González-Delgado et al.
  • 1Departamento de Biología Animal, Edafología y Geología, Facultad de Ciencias, Universidad de La Laguna, Canary Islands, Spain
  • 2Instituto de Oceanografía y Cambio Global, IOCAG-ULPGC, Universidad de Las Palmas de Gran Canaria, Canary Islands, Spain
  • 3Univ Brest, CNRS, IRD, Ifremer, LEMAR, F-29280 Plouzane, France

Abstract. We present a new natural carbon dioxide (CO2) system located off the southern coast of La Palma Island (Canary Islands, Spain). Like others CO2 seeps, these seeps can be used as an analogue to study the effects of ocean acidification (OA) on the marine realm. With this aim, we present an accurate chemical characterization of the seeps system carbon emissions, describing the carbon system dynamics, by measuring pH, AT and CT, as well as, Ω aragonite and calcite. Our explorations on the area have found several emission points with similar chemical features. Here, the CO2 emission flux varies between 2.8 kg CO2 d−1 to 28 kg CO2 d−1, becoming a significant source of carbon. CO2 seeps are of volcanic origin and the alteration of local ocean chemistry is due to acid brackish water discharges. Although this kind of acidified system is not a perfect image of future oceans, this area of La Palma island is an exceptional spot to perform studies aimed to understand the effect of different levels of OA on the functioning of marine ecosystems. These studies can then be used to comprehend how life has persisted through past Eras, with higher atmospheric CO2, or to predict the consequences of present fossil fuel usage on the marine ecosystem of the future oceans.

Sara González-Delgado et al.

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Sara González-Delgado et al.

Sara González-Delgado et al.

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Short summary
In this paper we describe the carbon system dynamics of a new CO2 seep system located off the coast of La Palma island. We explored over a year, finding points with lower levels of pH and alkalinity, high levels of carbon, and poorer levels of aragonite and calcite, both essential for calcifying species. Its seeps are a key feature for robust experimental designs, aimed to comprehend how life has persisted through past Eras or to predict the consequences of Ocean Acidification in marine realm.
In this paper we describe the carbon system dynamics of a new CO2 seep system located off the...
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