Scientists from the Irish Climate Analysis and Research Unit (ICARUS) at the University of Maynooth and the Potsdam Institute for Climate Impact Research (PIK) have published in Nature Geoscience the results of a model of historical changes in the AMOC - Atlantic Meridional Overturning Circulation. The results were compiled on the basis of proxy data, in particular sediment analysis, both in terms of granulation of the mineral material and species composition of sub-fossil remains, as well as historical measurements of the subsurface water temperature. The data allowed to conclude that the AMOC decline in the twentieth century is unprecedented and that over the past decades, the AMOC is in its weakest state in over a millennium. 

Link to an article in Nature Geosciences

Commentary on this report in the form of an interview with our colleague from the Institute of Oceanology of the Polish Academy of Sciences, prof. Jacek Piskozub, appeared on gazeta.pl in the supplement Piątek dla kilmatu (in polish).