FN Archimer Export Format PT J TI Ocean Circulation Drives the Variability of the Carbon System in the Eastern Tropical Atlantic BT AF Lefèvre, Nathalie Mejia, Carlos Khvorostyanov, Dmitry Beaumont, Laurence Koffi, Urbain AS 1:1;2:1;3:1;4:2;5:3; FF 1:;2:;3:;4:;5:; C1 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 Division Technique de l’Institut des Sciences de l’Univers, 1 Place Aristide Briand, 92195 Meudon, France Laboratoire des Sciences Physiques, Fondamentales et Appliquées de l’École Normale Supérieure, Abidjan 08 BP 10, Cote D’Ivoire C2 IPSL, FRANCE INSU, FRANCE ENS, FRANCE IN DOAJ TC 5 UR https://archimer.ifremer.fr/doc/00678/79046/81494.pdf LA English DT Article CR EGEE/3 PIRATA PIRATA FR29 BO L'Atalante Thalassa DE ;carbon cycle;tropical Atlantic;dissolved inorganic carbon;alkalinity AB 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 mol kg−1, are more important than the year-to-year variability that is less than 50 mol 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. PY 2021 PD MAR SO Oceans-switzerland SN 2673-1924 PU MDPI VL 2 IS 1 UT 001014864000001 BP 126 EP 148 DI 10.3390/oceans2010008 ID 79046 ER EF