The work is part of the European TiPES project, coordinated by the University of Copenhagen, Denmark but was conducted by Professor Michael Ghil, Ecole Normale Supérieure, Paris, France and coauthours from The Royal Meteorological Institute of Belgium and Parthenope University of Naples, Italy.
Two studies from the European TiPES project now add to the evidence that tipping could be imminent and might be more widespread in the climate system than usually anticipated.
El Ninõ tips weather-system
In the first study, the authors show in a coupled ocean-atmosphere model how the mid-latitude wind systems over Europe and North America has a probability to tip between different types of behaviour (or different regimes, as climate scientists say) depending on the strength of an El Niño. In other words, the climate phenomenon El Niño - during which heat builds up in the surface layers of the eastern tropical Pacific Ocean - determines whether the mid-latitude wind system in the U.S.A. will be more or less likely to shift abruptly between one regime and another.
Such probabilistic climate tipping complicates prediction, which is generally based on the assumption that climate systems change gradually in a more predictable manner. The findings, - co-authored with Stéphane Vannitsem and Jonathan Demaeyer from the Royal Meteorological Institute of Belgium and published in Journal of Advances in Modeling Earth Systems, thus explain why the patterns of precipitation and temperature during and after an El Niño, have been difficult to predict with accuracy up till now.
Tipping the Gulf Stream
The other result concerns rate-induced tipping. This kind of climate tipping takes place not because a certain threshold level is reached, like a CO2 level in the atmosphere, but rather because the rate of change is too fast for the system to evolve gradually.
The study - co-authored with Stefano Pierini from the Parthenope University of Naples and published in Scientific Reports, finds rate-induced tipping in a simplified model of the wind-driven ocean circulation for the first time. In this model study, the Gulf Stream - which distributes heat to the North Atlantic and plays an important role in keeping the temperatures in Western Europe relatively mild - tips between regimes when CO2 is introduced at a rapid rate into the model.
A real risk
Such a result is highly relevant as levels of CO2 in the atmosphere currently go up at an unprecedented rate. If the Gulf Stream eventually tips in this rate-induced manner, Western Europe could experience rather abrupt changes to its climate.
"These results indicate that climate tipping is an imminent risk in the Earth System. Even the safe operating space of 1.5 or 2.0 degrees above present generally assumed by the IPCC might not be all that safe. According to the precautionary principle, we must consider abrupt and irreversible changes to the climate system as a real risk - at least until we understand these phenomena better," says Professor Michael Ghil.
The TiPES project is an EU Horizon 2020 interdisciplinary climate science project on tipping points in the Earth system. 18 partner institutions work together in more than 10 countries. TiPES is coordinated and led by The Niels Bohr Institute at the University of Copenhagen, Denmark and the Potsdam Institute for Climate Impact Research, Germany.
The TiPES project has received funding from the European Horizon 2020 research and innovation program, grant agreement number 820970.
This news release is about two studies.
1) Pierini, S., and M. Ghil, 2021: Climate tipping points induced by parameter drift: an excitable system study, Scientific Reports, 11, 11126, doi:10.1038/s41598-021-90138-1, https://rdcu.be/clp5V.
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2) Vannitsem, S., J. Demaeyer, and M. Ghil, 2021: Extratropical low-frequency variability with ENSO forcing: A reduced-order coupled model study, Journal of Advances in Modeling Earth Systems, 13, e2021MS002530, doi:10.1029/2021MS002530.