06.03.2025

New Paper on the interhemispheric coupling during past abrupt climate changes

Congratulations to Irene Trombini, Nils Weitzel, and coauthors to the publication of their new paper!

Irene Trombini, Nils Weitzel, and a team including Jean-Philippe Baudouin, and Kira Rehfeld published a new paper in Geophysical Research Letters. The paper is titled "Atmospheric and Oceanic Pathways Drive Separate Modes of Southern Hemisphere Climate in Simulations of Spontaneous Dansgaard‐Oeschger‐Type Oscillations" and builds on the Master thesis by Irene Trombini. We analyze simulations with large amplitude millennial-scale variability performed at the University of Bristol with the climate model HadCM3B. We find that the climate change signal is transported from the North Atlantic to the Southern Hemisphere via two separate pathways: an atmospheric pathway, which varies synchronously with North Atlantic temperatures, and an oceanic pathway, which is phase-shifted compared to North Atlantic temperatures. Comparing simulated oxygen isotope ratios with speleothem and ice cores indicates a good agreement in the tropics and SH mid‐latitudes but deviations in Antarctica that warrant further research.