High-resolution study of the air-sea CO2 flux and net community oxygen production in the Ligurian Sea by a fleet of gliders

Frontiers in Marine Science

Marine Science

Orens Pasqueron de Fommervault¹  Laurent Béguery¹  Emilie Diamond Riquier²  Antoine Poteau³  Marine Fourrier³  Laurent Coppola⁴ 

[1] Alseamar-Alcen, Rousset, France;Sorbonne Université, CNRS, Institut de la Mer de Villefranche (IMEV), Villefranche-sur-Mer, France;Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche (LOV), Villefranche-sur-Mer, France;Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche (LOV), Villefranche-sur-Mer, France;Sorbonne Université, CNRS, Observatoire des Sciences de l’Univers (OSU) Station Marines (STAMAR), Paris, France;

关键词: net community production;    air-sea CO2 flux;    dissolved oxygen;    ocean gliders;    Mediterranean Sea;   

DOI  :  10.3389/fmars.2023.1233845

 received in 2023-06-02, accepted in 2023-08-28,  发布年份 2023

来源: Frontiers

【 摘 要 】

Intense glider monitoring was conducted in the Ligurian Sea for five months to capture the Net Community Production (NCP) variability in one of the most dynamic and productive regions of the Mediterranean Sea. Using the SeaExplorer glider technology, we were able to observe continuously from January to the end of May 2018 the physical and biogeochemical variables during the last period of intense convection observed in this region. High-frequency measurements from these gliders provided valuable information for determining dissolved O2 (DO) concentrations between coastal and open sea waters. Our DO balance approach provided an estimate of NCP fluxes complemented by the prediction of air-sea CO2 fluxes based on a neural network adapted to the Mediterranean Sea (CANYON-MED). Based on our NCP calculation method, our results show that the air-sea O2 flux and DO inventory have contributed largely to the NCP variability. The NCP values also suggest that heterotrophic conditions were predominant in winter and became autotrophic in spring, with strong variability in coastal waters due to the occurrence of sub-mesoscale structures. Finally, CO2 fluxes at the air-sea interface reveal that during the convection period, the central zone of the Ligurian Sea acted as a CO2 sink from January to March with little impact on NCP fluxes counterbalanced by a thermal effect of seawater.

【 授权许可】

Unknown   
Copyright © 2023 Coppola, Fourrier, Pasqueron de Fommervault, Poteau, Riquier and Béguery