FN Archimer Export Format PT J TI Seasonal and Interannual Variability of the CO2 System in the Eastern Mediterranean Sea: A Case Study in the North Western Levantine Basin BT AF Wimart-Rousseau, Cathy Wagener, Thibaut Álvarez, Marta Moutin, Thierry Fourrier, Marine Coppola, Laurent Niclas-Chirurgien, Laure Raimbault, Patrick D’Ortenzio, Fabrizio Durrieu de Madron, Xavier Taillandier, Vincent Dumas, Franck Conan, Pascal Pujo-Pay, Mireille Lefèvre, Dominique AS 1:1;2:1;3:2;4:1;5:3;6:3,4;7:1;8:1;9:3;10:5;11:3;12:6;13:7;14:7;15:1; FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;14:;15:; C1 Aix Marseille Université, Université de Toulon, CNRS, IRD, MIO, UM 110, Marseille, France Instituto Español de Oceanografia, A Coruña, Spain Sorbonne Université, CNRS, Laboratoire d’Océanographie de Villefranche, Villefranche-sur-Mer, France Sorbonne Université, CNRS, Institut de la Mer de Villefranche, Villefranche-sur-Mer, France CEFREM, CNRS-Université de Perpignan Via Domitia, Perpignan, France Service Hydrographique et Océanographique de la Marine—Shom, Brest, France Sorbonne Université, CNRS, Laboratoire d’Océanographie Microbienne, Observatoire Océanologique, Banyuls-sur-Mer, France C2 UNIV AIX MARSEILLE, FRANCE IEO, SPAIN UNIV SORBONNE, FRANCE UNIV SORBONNE, FRANCE CEFREM, FRANCE SHOM, FRANCE UNIV SORBONNE, FRANCE SI TOULON SE MIO IN DOAJ IF 5.247 TC 7 UR https://archimer.ifremer.fr/doc/00697/80878/84604.pdf https://archimer.ifremer.fr/doc/00697/80878/84605.pdf LA English DT Article CR PERLE2 PROTEVSMED_PERLE_2018 BO Pourquoi pas ? L'Atalante DE ;carbonate system;Mediterranean Sea;acidification;CO2 fluxes;Levantine Sea;inorganic carbon AB The seasonal variability of the carbonate system in the eastern Mediterranean Sea (EMed) was investigated based on discrete total alkalinity (AT), total dissolved inorganic carbon (CT), and pH measurements collected during three cruises around Crete between June 2018 and March 2019. This study presents a detailed description of this new carbonate chemistry dataset in the eastern Mediterranean Sea. We show that the North Western Levantine Basin (NWLB) is unique in terms of range of AT variation vs. CT variation in the upper water column over an annual cycle. The reasons for this singularity of the NWLB can be explained by the interplay between strong evaporation and the concomitant consumption of CT by autotrophic processes. The high range of AT variations, combined to temperature changes, has a strong impact on the variability of the seawater pCO2 (pCO2SW). Based on Argo float data, an entire annual cycle for pCO2SW in the NWLB has been reconstructed in order to estimate the temporal sequence of the potential “source” and “sink” of atmospheric CO2. By combining this dataset with previous observations in the NWLB, this study shows a significant ocean acidification and a decrease in the oceanic surface pHT25 of −0.0024 ± 0.0004 pHT25 units.a–1. The changes in the carbonate system are driven by the increase of atmospheric CO2 but also by unexplained temporal changes in the surface AT content. If we consider that the EMed will, in the future, encounter longer, more intense and warmer summer seasons, this study proposes some perspectives on the carbonate system functioning of the “future” EMed. PY 2021 PD MAY SO Frontiers In Marine Science SN 2296-7745 PU Frontiers Media SA VL 8 UT 000656247800001 DI 10.3389/fmars.2021.649246 ID 80878 ER EF