Atlantic inflow into the southern Nordic Seas at the onset of the LGM promotes open-ocean conditions and Fennoscandian Ice Sheet growth@en

Tephra analysis (FMAZ II-1 tephra marker) on a network of ten marine sediment cores in the northern North Atlantic is presented as well as radiocarbon dates (14C) by Accelerator Mass Spectrometry (AMS) of the same layers. We use published data for the Tephra horizon's identified in the cores together with eight already published 14C AMS dates. In two out of the ten cores we newly 14C AMS date. Here, we add radiocarbon dates to the existing ones from the FMAZ II-1 tephra layer from two key sites in the high-latitude North Atlantic Ocean: offshore southeast Greenland (GS16-204-18CC) and the southern Norwegian Sea (MD99-2284). The purpose of radiocarbon dating the volcanic ash layers in the marine sediments is to derive marine 14C reservoir ages (MRAs) from a spatial network of ten marine sediment cores for investigating past changes in the North Atlantic surface ocean circulation. […]