EGU General Assembly 2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Meridional Connectivity of a 25-year Observational AMOC Record at 47°N

Simon Wett1,2, Monika Rhein1,2, Dagmar Kieke1,2,3, Christian Mertens1,2, and Martin Moritz3
Simon Wett et al.
  • 1Institute of Environmental Physics, University of Bremen, Bremen, Germany
  • 2MARUM Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany
  • 3Federal Maritime and Hydrographic Agency (BSH), Hamburg, Germany

The Atlantic Meridional Overturning Circulation (AMOC) plays a key role for the climate system of Europe and the Arctic by redistributing heat and freshwater in the Atlantic. Since climate model studies project a likely decline of the AMOC under climate change in the 21st century, monitoring AMOC changes remains an important task. Several moored arrays in the Atlantic deliver estimates of the AMOC volume transport. The longest of these observational AMOC records is the RAPID array in the subtropical North Atlantic. The depiction of the AMOC as a global ocean conveyor assumes that the AMOC variability is consistent across latitudes. This concept has been questioned by model studies. However, model studies and estimates based on altimetry and Argo data disagree on the regions and timescales of meridional connectivity. From measurements of the North Atlantic Changes (NOAC) array in the subpolar North Atlantic at 47°N we calculate the AMOC volume transport timeseries. Our approach combines data from moored instruments with hydrography (from Argo floats and shipboard measurements) and satellite altimetry. Here, we present this 25-year (1993-2018) purely observational AMOC record in monthly resolution and analyze its meridional connectivity with the subtropical RAPID AMOC.

How to cite: Wett, S., Rhein, M., Kieke, D., Mertens, C., and Moritz, M.: Meridional Connectivity of a 25-year Observational AMOC Record at 47°N, EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-5053,, 2023.