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Article

Ocean Circulation Drives the Variability of the Carbon System in the Eastern Tropical Atlantic

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Institut de Recherche Pour le Développement, Laboratoire d’Océanographie et du Climat Expérimentations et Approches Numériques (LOCEAN), Sorbonne Université, Centre National de la Recherche Scientifique, Muséum National d’Histoire Naturel, 4 Place Jussieu, 75005 Paris, France
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Division Technique de l’Institut des Sciences de l’Univers, 1 Place Aristide Briand, 92195 Meudon, France
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Laboratoire des Sciences Physiques, Fondamentales et Appliquées de l’École Normale Supérieure, Abidjan 08 BP 10, Côte d’Ivoire
*
Author to whom correspondence should be addressed.
Academic Editor: Michael W. Lomas
Oceans 2021, 2(1), 126-148; https://doi.org/10.3390/oceans2010008
Received: 14 December 2020 / Revised: 29 January 2021 / Accepted: 3 February 2021 / Published: 8 February 2021
The carbon system in the eastern tropical Atlantic remains poorly known. The variability and drivers of the carbon system are assessed using surface dissolved inorganic carbon (DIC), alkalinity (TA) and fugacity of CO2 (fCO2) measured in the 12° N–12° S, 12° W–12° E region from 2005 to 2019. A relationship linking DIC to temperature, salinity and year has been determined, with salinity being the strongest predictor. The seasonal variations of DIC, ranging from 80 to 120 μμmol kg−1, are more important than the year-to-year variability that is less than 50 μμmol kg−1 over the 2010–2019 period. DIC and TA concentrations are lower in the northern part of the basin where surface waters are fresher and warmer. Carbon supply dominates over biological carbon uptake during the productive upwelling period from July to September. The lowest DIC and TA are located in the Congo plume. The influence of the Congo is still observed at the mooring at 6° S, 8° E as shown by large salinity and chlorophyll variations. Nevertheless, this site is a source of CO2 emissions into the atmosphere. View Full-Text
Keywords: carbon cycle; tropical Atlantic; dissolved inorganic carbon; alkalinity carbon cycle; tropical Atlantic; dissolved inorganic carbon; alkalinity
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MDPI and ACS Style

Lefèvre, N.; Mejia, C.; Khvorostyanov, D.; Beaumont, L.; Koffi, U. Ocean Circulation Drives the Variability of the Carbon System in the Eastern Tropical Atlantic. Oceans 2021, 2, 126-148. https://doi.org/10.3390/oceans2010008

AMA Style

Lefèvre N, Mejia C, Khvorostyanov D, Beaumont L, Koffi U. Ocean Circulation Drives the Variability of the Carbon System in the Eastern Tropical Atlantic. Oceans. 2021; 2(1):126-148. https://doi.org/10.3390/oceans2010008

Chicago/Turabian Style

Lefèvre, Nathalie, Carlos Mejia, Dmitry Khvorostyanov, Laurence Beaumont, and Urbain Koffi. 2021. "Ocean Circulation Drives the Variability of the Carbon System in the Eastern Tropical Atlantic" Oceans 2, no. 1: 126-148. https://doi.org/10.3390/oceans2010008

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