New insights into the eastern subpolar North Atlantic meridional overturning circulation from OVIDE

Mercier, Herlé; Desbruyères, Damien; Lherminier, Pascale; Velo, Antón; Carracedo, Lidia; Fontela, Marcos; Pérez, Fiz F.

doi:https://doi.org/10.5194/os-20-779-2024

Articles | Volume 20, issue 3

https://doi.org/10.5194/os-20-779-2024

© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/os-20-779-2024

© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 20, issue 3

Review article

|

14 Jun 2024

Review article |

| 14 Jun 2024

New insights into the eastern subpolar North Atlantic meridional overturning circulation from OVIDE

Herlé Mercier, Damien Desbruyères, Pascale Lherminier, Antón Velo, Lidia Carracedo, Marcos Fontela, and Fiz F. Pérez

Supplement

https://doi.org/10.5194/os-20-779-2024-supplement

Data sets

ECCO Ancillary Data ECCO Consortium et al. https://doi.org/10.5067/ECCL4-ANC44

Global Ocean- Delayed Mode gridded CORA-In-situ Observations ob- jective analysis in Delayed Mode E.U. Copernicus Marine Service Information (CMEMS) https://doi.org/10.17882/46219

Global Ocean Ensemble Physics Reanalysis E.U. Copernicus Marine Service Information (CMEMS) https://doi.org/10.48670/moi-00024

Global Ocean Gridded L4 Sea Surface Heights And Derived Variables Reprocessed E.U. Copernicus Marine Service Information (CMEMS) https://doi.org/10.48670/moi-00145

The Greenland-Portugal Go-Ship A25 OVIDE CTDO2 hydrographic data Herle Mercier et al. https://doi.org/10.17882/46448

EN4: quality controlled subsurface ocean temperature and salinity profiles and objective analyses Met Office https://www.metoffice.gov.uk/hadobs/en4/

The North Atlantic Oscillation NOAA NWS https://www.cpc.ncep.noaa.gov/products/precip/CWlink/pna/nao.shtml

The NCEP-NCAR Reanalysis 1 NOAA PSL https://psl.noaa.gov/data/gridded/data.ncep.reanalysis.html

Short summary

We study the Atlantic Meridional Overturning Circulation (AMOC) measured between Greenland and Portugal between 1993–2021. We identify changes in AMOC limb volume and velocity as two major drivers of AMOC variability at subpolar latitudes. Volume variations dominate on the seasonal timescale, while velocity variations are more important on the decadal timescale. This decomposition proves useful for understanding the origin of the differences between AMOC time series from different analyses.