Carbonate system properties and anthropogenic carbon inventory in the Algerian Basin during SOMBA cruise (2014): Acidification estimate

Type Article
Date 2020-04
Language English
Author(s) Keraghel Mehdia Asma1, Louanchi Ferial1, Zerrouki Mohamed1, Kaci Malik Ait1, Aït-Ameur Nadira1, Labaste Matthieu2, Legoff Hervé2, Taillandier Vincent3, Harid Romaissa4, Mortier Laurent2
Affiliation(s) 1 : CVRM: Laboratoire de Conservation et de Valorisation des Ressources Marines, Ecole Nationale Supérieure des Sciences de la Mer et de l'Aménagement du Littoral (ENSSMAL), Station de recherche de Sidi Fredj, Algeria
2 : LOCEAN: Laboratoire d'Océanographie et du Climat: Expérimentations et Approches Numériques, Unité Mixte de Recherche 7159 CNRS/IRD/Université Pierre et Marie Curie/MNHN, Institut Pierre Simon Laplace, place Jussieu, 75252 Paris, France
3 : LOV: CNRS, Laboratoire d'Océanographie de Villefranche, Sorbonne Universités, Villefranche-sur-Mer, France
4 : ECOSYSMarL: Laboratoire des Écosystèmes Marins et Littoraux, ENSSMAL, Station de recherche de Sidi Fredj, Algeria
Source Marine Chemistry (03044203) (Elsevier BV), 2020-04 , Vol. 221 , P. 103783 (16p.)
DOI 10.1016/j.marchem.2020.103783
Keyword(s) Algerian Basin, Carbonate system, Anthropogenic carbon inventory, Acidification, Mesoscale activity
Abstract

Recent studies have provided a better understanding of carbonate system parameters and their spatial and temporal variability in several areas of the Mediterranean Sea. This study uses a new dataset that covered the entire Algerian Basin during the summer of 2014 (SOMBA cruise) to describe the distribution of carbonate system parameters. The findings show that almost the entire basin was a source of CO2 to the atmosphere during the studied period. Besides the well-known TrOCA (Tracer combining Oxygen, Carbon and total Alkalinity) approach, the study proposes new parametrization for the standard back calculation method to assess the anthropogenic carbon concentration. The results of both approaches yield similar distributions and concentration ranges (81 ± 4.3 and 69 ± 5.2 μmol/kg, respectively). This study assesses the errors for both approaches and emphasizes the importance of mesoscale and submesoscale structures on anthropogenic carbon sequestration and the distribution of carbonate parameters in the Algerian Basin. It shows that these features enhance basin ventilation and acidification. The first inventory of the anthropogenic carbon trapped by the Algerian Basin is estimated at 0.44–0.53 ± 0.06 Pg C, based on the new dataset.

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Keraghel Mehdia Asma, Louanchi Ferial, Zerrouki Mohamed, Kaci Malik Ait, Aït-Ameur Nadira, Labaste Matthieu, Legoff Hervé, Taillandier Vincent, Harid Romaissa, Mortier Laurent (2020). Carbonate system properties and anthropogenic carbon inventory in the Algerian Basin during SOMBA cruise (2014): Acidification estimate. Marine Chemistry, 221, 103783 (16p.). Publisher's official version : https://doi.org/10.1016/j.marchem.2020.103783 , Open Access version : https://archimer.ifremer.fr/doc/00615/72729/