• Prof.
    • René van Westen
    • Universiteit Utrecht - The Netherlands
    • AMOC tipping dynamics

Tipping points in the Climate System

Dynamical systems arise in many areas of physics and mathematics, and one of the most famous examples in fluid dynamics is the Lorenz attractor. This system can exhibit chaotic behavior for certain parameter values, giving rise to the well-known "butterfly" pattern. The transition from a stable steady state to chaotic behavior can be seen as crossing a tipping point within the parameter range of the Lorenz system. Beyond the Lorenz attractor, various dynamical systems also operate within Earth's climate system, some of which can undergo similar transitions. A key example is the Atlantic Meridional Overturning Circulation (AMOC), often associated with the Gulf Stream. A collapse of this ocean circulation would have profound climate and societal impacts. In particular, Northwestern Europe - including the Netherlands - could experience significantly cooler temperatures if the circulation were to weaken or collapse due to climate change. In this talk, we will explore the underlying physics of climate tipping points and focus in particular on the AMOC and its potential implications.

About

René van Westen (1993, PhD 2021) is an early career scientist. He is specialised in ocean variability across spatial and temporal scales, and in high-resolution climate modelling. He has a strong background in physical oceanography, non-linear dynamics and the role of mesoscale ocean eddies in the global climate. His latest research focuses on tipping events in the Atlantic Meridional Ocean Circulation (AMOC). He demonstrated that AMOC tipping is possible in the latest generation of climate models and this resulted in a breakthrough within the AMOC research community. Van Westen is actively involved in public engagement (podcast maker of “Klimaat van Vandaag”) and is a strong advocate for open science and outreach. His latest research received mass media coverage and he conducted more than 100 interviews and live performances. His current research is centered around the role of ocean sea-ice interactions in AMOC tipping dynamics.