The coupled ice sheet-Earth system model Bern3D v3.0 ...

• Main Authors: Pöppelmeier, Frerk, Joos, Fortunat, Stocker, Thomas F.
• Format: Text
• Language: unknown
• Published: American Meteorological Society 2023
• Subjects: 530 Physics; 550 Earth sciences & geology; Ice Sheet; North Atlantic
• Online Access: https://dx.doi.org/10.48350/186852; https://boris.unibe.ch/186852/

Understanding climate variability from millennial to glacial–interglacial time scales remains challenging due to the complex and nonlinear feedbacks between ice, ocean, sediments, biosphere, and atmosphere. Complex climate models generally struggle to dynamically and comprehensively simulate such long time periods as a result of the large computational costs. Here, we therefore coupled a dynamical ice sheet model to the Bern3D Earth system model of intermediate complexity, which allows for simulating multiple glacial–interglacial cycles. The performance of the model is first validated against modern observations and its response to abrupt perturbations, such as atmospheric CO2 changes and North Atlantic freshwater hosing, is investigated. To further test the fully coupled model, the climate evolution over the entire last glacial cycle is explored in a transient simulation forced by variations in the orbital configuration and greenhousegases and aerosols. The model simulates global mean surface temperature in ...