I convene this session together with @felixschaumann.bsky.social, Maya Ben Yami, Amber Boot, & Oliver Mehling, so please ask any of us if you have questions! 😊

We welcome contributions from very broad AMOC impact types (physical, biogeochemical, or socioeconomic), timescales (paleoclimate, recent past, future projections), forcings (variability, forced trends, abrupt/tipping) & tools (Earth System/regional/simple/economic models, reanalyses/observations) 🧪

The paper was led by @andrewkingclimate.bsky.social and included @climatenerilie.bsky.social & Tilo Ziehn 👏🏻

The conference was a great mix between theoretical, modelling, and observational approaches in understanding the role of the ocean in the climate system, as we celebrate the MPI-M 50th anniversary! mpimet.mpg.de/en/communica...

Overall, while the multidecadal changes found here would be smaller than the direct effects from global warming, our study highlights how many of these changes are significant and consistent among different models, while emphasising the global reach of AMOC impacts 💡

(5/5)

We find, as expected, that a weaker AMOC leads to a buildup of heat in the Southern Ocean, warmer temperatures and sea-ice loss 🌡️

More surprisingly, we identify a new tropical-Antarctic atmospheric teleconnection, which explains why there is cooling and sea-ice growth in the Weddell Sea 🏝️🧊

(4/n)

We use the simulations we previously introduced in the NAHosMIP, a multi-model intercomparison of freshwater hosing experiments 🚿 This hosing induces an idealised AMOC weakening so that we can calibrate and separate AMOC impacts

doi.org/10.5194/gmd-...

(3/n)

While several studies have investigated the Southern Ocean response to AMOC changes, the multidecadal Antarctic sea-ice response is still unknown ❓

We investigate Southern Ocean sea ice & temperature changes, along with changes in many drivers, such as heat transport or circulation changes 🔎

(2/n)

🗞️ Read here the press release by CLICCS/@cenunihh.bsky.social: www.cliccs.uni-hamburg.de/about-cliccs... (6/6)

💭 Implications

This first assessment of European heat extremes in long-term net-zero futures highlights the need to reduce emissions promptly, as well as better understand the underlying mechanisms and the policy consequences of long-term net-zero changes ⌛️ (5/n)

💡 Key takeaways:

- Even under net zero, Europe might face intensified heat extremes for centuries 🌡️
- Short delays in emissions cessation would result in even more intense extremes 📈
- The path to reach a global temperature target matters for the extreme heat distribution 🥵

(4/n)