Dansgaard-Oeschger events - time series analysis and modelling across the hierarchy

Abstract

The Dansgaard-Oeschger (DO) events are characteriszed by pronounced abrupt changes in climatic conditions in high northern latitudes. While they have first been discovered in Greenland ice core records, their imprints are global and can be deteced in proxy archives across the globe. They can be considered as the archetype of abrupt climate changes for which empirical evidence exists, but have not yet been fully explained. In this talk I will present some recent results from analyzing ice-core derived time series with a focus on dating uncertainties, from concentual models proposing unerling physical mechanisms, and from comparing spatial patterns of the impacts of the DO events on global atmospheric circulation patterns.