Key processes of meridional connectivity (WP2)

Objective: Determine key processes that make or break meridional (north-south) connectivity of ocean transports, and assess their representation in models, especially in high resolution coupled simulations.


  • Identify mechanisms responsible for AMOC coherence across key latitudes in the Atlantic;
  • Clarify the relationship between the DWBC, AMOC and ventilation;
  • Quantify the influence of the North Atlantic Current on the variability of the DWBC.

The ocean provides ‘memory’ to the Earth’s climate system through the high heat capacity of water, but also the redistribution of heat from the surface to the deep ocean and across latitudes. In regions and at timescales where the AMOC is coherent, the co-variability of the large-scale ocean circulation increases the predictability of the climate system and simplifies the observational strategy. In areas where the AMOC is incoherent, the different transport variability across latitudes results in the convergence or divergence of ocean heat and freshwater content, and can lead to forcing of the atmosphere, weather and climate.

Using the AMOC records developed by EPOC, coupled and forced ocean models, and a targeted 2-year process study, we will determine over what regions and on what timescales the large-scale ocean circulation behaves as a coherent circulation pattern vs where coupled or internal ocean processes lead to incoherent behaviour.