A new view on abrupt climate changes and the bipolar seesaw based on paleotemperatures from Iberian Margin sediments.

ABSTRACT: The last glacial cycle provides the opportunity to investigate large changes in the Atlantic Meridional Overturning Circulation (AMOC) beyond the small fluctuations evidenced from direct measurements. Paleotemperature records from Greenland and the North Atlantic show an abrupt variability, called Dansgaard-Oeschger (DO) events, which is associated with abrupt changes of the AMOC. These DO events also have Southern Hemisphere counterparts via the thermal bipolar seesaw, a concept describing the meridional heat transport leading to asynchronous temperature changes between both hemispheres. However, temperature records from the North Atlantic show more pronounced DO cooling events during massive releases of icebergs known as Heinrich (H) events, contrary to ice-core-based temperature records

SUBMITTER: Davtian N 

PROVIDER: S-EPMC10041096 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature