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Check below for news highlights

  • Jun 2025: OVIDE 2025 cruise (A25 GOSHIP section). +INFO
  • Feb 2024: Paper published in Nature Communications. +INFO
  • Mar 2022: Project CARING funded by LEFE, ISBlue and EUROFLEETS. +INFO
  • Nov 2021:  PhD student and postdoc started @LOPS in Nov 2021. +INFO
  • Aug 2021: PhD student started @IIM-CSIC (Spain) in Aug 2021. +INFO
  • May 2021: Project OCCEAN2s funded by ARED Region Bretagne and ODE. +INFO
  • Mar 2021 - Article in the Spanish ABC journal in March 2021 (download article).
  • Feb 2021 - CANAIMOC workshop @LOPS (France) in February 2021. +INFO


OVIDE 2025

The OVIDE 2015 cruise will take place in
Jun 2025 (pending date confirmation) along the Portugal to
Greendland OVIDE section. OVIDE 2025 cruise continues
the occupation of the A25-OVIDE biennial section, part of
the international GO-SHIP programme.



Anthropogenic carbon pathways towards the North Atlantic interior revealed by Argo- O2, neural networks and back-calculations

Published in Nature Communications

Feb 2024

The subpolar North Atlantic (SPNA) is a region of high anthropogenic CO2 (Cant) storage per unit area. Although the average Cant distribution is well documented in this region, the Cant pathways towards the ocean interior remain largely unresolved. We used observations from three Argo-O2 floats spanning 2013-2018 within the SPNA, combined with existing neural networks and back-calculations, to determine the Cant evolution along the float pathways from a quasi-lagrangian perspective. Our results show that Cant follows a stepwise deepening along its way through the SPNA. The upper subtropical waters have a stratified Cant distribution that homogenizes within the winter mixed layer by Subpolar Mode Water formation in the Iceland Basin. In the Irminger and Labrador Basins, the high-Cant footprint (> 55 μmol kg−1) ismixed down to 1400 and 1800 dbar, respectively, by deep winter convection. As a result, the maximum Cant concentration is diluted (<45 μmol kg−1). Our study highlights the roleofwater mass transformation as a first-ordermechanism for Cant penetration into the ocean. It also demonstrates the potential of Argo-O2 observations, combined with existing methods, to obtain reliable Cant estimates, opening ways to study the oceanic Cant content at high spatio-temporal resolution.

Citation: Asselot, R., Carracedo, L.I., Thierry, V. et al. Anthropogenic carbon pathways towards the North Atlantic interior revealed by Argo-O2, neural networks and back-calculations. Nat Commun 15, 1630 (2024).


Marta López Mozos

PhD student @IIM-CSIC (Spain)
BOCATS2 Project
Aug 2021 - Jul 2025

Remy Asselot

Postdoc @LOPS (France)
EuroSea Project
Nov 2021 - May 2023

Raphaël Bajon

PhD student @LOPS (France)
OCCEAN2s Project
Nov 2021 - Nov 2024


The accumulation of anthropogenic carbon (Cant) in the North Atlantic is strongly linked to the Meridional Overturning Circulation (MOC) (ref. 1), which is highly variable and predicted to decline during the 21st century as the Earth warms (ref. 2). At 26°N, the upstream extension of the Gulf Stream, namely the Florida Current (FC), is confined to a very narrow passage of about 90 km and 800 m depth off the east coast of Florida (Florida Straits). This very intense current (~32 Sv, ref. 3) comprises the bulk of the Cant-loaded upper northward limb of MOC (refs. 1, 4). Hence, gaining a better understanding of the magnitude, variability, and likely future trends in North Atlantic carbon accumulation in response to changing upper MOC, that is, changes in volume, heat, carbon and nutrient transports as observed across the Florida Straits, is crucial for determining the fate of global carbon stocks and the impacts on North Atlantic ecosystems.

Within this context, the CANAIMOC Workshop* aimed to favour discussion and exchange of ideas on the study of the role of the Gulf Stream on the carbon cycle in the North Atlantic.

The CANAIMOC Workshop (February 2021) consisted of three separate events:

# 1-day Educational Seminar Session (with students), 17 Feb

# 2-day Science Seminar Session (open to scientific community), 23-24 Feb

# 1-day Project Discussion Session (with collaborators): 25 Feb

(*) This workshop was supported by LOPS (Laboratory for Ocean Physics and Satellite remote sensing) and ISblue project, Interdisciplinary graduate school for the blue planet (ANR-17-EURE-0015) and co-funded by a grant from the French government under the program "Investissements d'Avenir".

1 Pérez, F. F. et al. Atlantic Ocean CO₂ uptake reduced by weakening of the meridional overturning circulation. Nature  Geoscience 6, 146–152 (2013);
2 IPCC, 2019: IPCC Special Report on the Ocean and Cryosphere in a Changing Climate [H.-O. Pörtner, D.C. Roberts, V. Masson-Delmotte, P. Zhai, M. Tignor, E. Poloczanska, K. Mintenbeck, A. Alegría, M. Nicolai, A. Okem, J. Petzold, B. Rama, N.M. Weyer (eds.)]. In press;
3 Baringer, M. O. & Larsen, J. C. Sixteen years of Florida Current Transport at 27° N. Geophys. Res. Lett. 28, 3179–3182 (2001);
4 Meinen, C. S., Baringer, M. O. & Garcia, R. F.Florida Current transport variability: An analysis of annual and longer-period signals. Deep Sea Research Part I: Oceanographic Research Papers 57, 835–846 (2010). 

                    CANAIMOC Virtual Workshop - Science Seminar Session Program


Session 1: AMOC variability

Tue 23th Feb, 1500-1640 (CET)

Chair: L. Carracedo (LOPS, Ifremer, France) 

15:00 – 15.10     Welcome and overview Seminar Session 1.
15.10 – 15:25     AMOC across the OVIDE section. H. Mercier (LOPS, CNRS, France)
15:25 – 15:40    AMOC across RAPID section. E. Frajka-Williams (NOC, UK)
15:40 – 15:55    AMOC mechanisms. S. Lozier (Georgia Tech, Earth and Atmospheric Sciences, USA)
15:55 – 16:10     Latitudinal shift of the AMOC source regions. C. Lique (LOPS, Ifremer, France)
16:10 – 16:25     Mechanisms of ocean heat content variability. D. Desbruyères (LOPS, Ifremer, France)
16:25 – 16:40    Q&A.  Closing up Science Seminar Session 1.


Session 2: Feedbacks between the AMOC and ocean carbon cycle

Tue 23th Feb, 1640-1800 (CET)

Chair: M. Garcia-Ibáñez (UEA, UK) 

16:40 – 16:45    Overview Seminar Session 2.
16:45 – 17:00    Cant and excess ocean heat content in the Subtropical NA Ocean. M.J. Messias (Uni of Exeter, UK)
17:00 – 17:15     Cant in the subpolar gyre. F. F. Pérez (IIM-CSIC, Spain)
17:15 – 17:30     Cant transport across RAPID. P. Brown (NOC, UK)
17:30 – 17:45     MOC regulation of nutrient inventories in the North Atlantic. L. Carracedo (LOPS, Ifremer, France)
17:45 – 18:00    Q&A. Closing up Science Seminar Session 2. 


Session 3: The Florida Current/Gulf Stream as an anthropogenic carbon and nutrient stream 

Wed 24th Feb 2021, 1430-1800 (CET)

Chair: P. Lherminier (LOPS, Ifremer, France) 

14:30 – 14:40    Welcome and overview Seminar Session 3.
14:40 – 14:55    Florida Current variability. D. Volkov (AOML, NOAA, USA)
14:55 – 15:10    Likely weakening of the Florida Current during the past century. C. Piecuch (WHOI, USA)
15:10 – 15:25    Freshwater/heat transport across the Florida Strait. E. McDonagh (NORCE, Norway)
15:30 – 15:45    DIC transport across the Florida Strait. N. Bates (BIOS, Bermuda)
15:45 – 16:00    DIC transport and coastal acidification off the east coast of Florida. Y. Xu (AOML, NOAA, USA)
16:00 – 16:15    Surface OA in the Northern Caribbean Sea, including the FC. R. Wanninkhof (AOML, NOAA, USA)
16:15 – 16:30    Ocean carbon uptake in the Gulf Stream and STMW region. J. Palter (Uni of Rhode Island, USA)

16:35 – 16:50    The North Atlantic nutrient stream. R. Williams (Uni of Liverpool, UK)
16:50 – 17:05    N₂ fixation in the Gulf Stream. M. Benavides (MIO, France)
17:05 – 17:20    Diapycnal nutrient fluxes to the euphotic zone in the Florida Straits. J.Z. Zhang (AOML, NOAA, USA)
17:20 – 17:35    Nutrient variability across Florida Straits. L. Carracedo (LOPS, Ifremer, France)
17:35 – 17:50    Pursuing new measures of change in the Florida Straits, L. Beal & H. Close (RSMAS, Uni of Miami, USA)
17:50 – 18:00   Q&A. Closing up Science Seminar Session.