Task 2.3: Multi-parameter study of key climate transitions in Marine Interstadial 3 using synchronized Arctic marine and ice core archives from work package 1 to better isolate the key physical processes involved.
The sequence of more than 10 Dansgaard-Oeschger events happening during Marine Interstadial 3 (MIS3), makes this interval a very promising focal point for studying rapid transitions in detail. For MIS3 we will have Greenland ice core information from southern, central, eastern, northern and north-western Greenland at our disposal, making it possible to see changes develop across the Greenland ice sheet. For the Nordic Seas we will be able to use data from existing core collections with high resolution records available in the eastern Nordic seas. These will be supplemented by cores from off East Greenland, from the dedicated cruise. New high resolution sampling will be performed in existing cores and supplementing sea ice indexes be used. The main emphasis here will be on investigating phasing of signals and quantifying the spatial coherency.
Atlantic Meriodonal Overturning Circulation (AMOC) variability will be studied in terms of dating and reconstructing surface inflow variability and deep water outflow variability between the North Atlantic and the Nordic Seas within the same age model framework, to allow for analyses of alternate hypotheses.