Thomas Frölicher

This Thursday at 10am CET, join us for Climate Coffee!
We'll talk about marine heatwaves, high acidity and low oxygen events - big threats to marine ecosystems 🔥 🐋
Findings from a study co-authored with @froeltho.bsky.social and Friedrich Burger 🙌
Link for registration below

Klimaschutz im Graubereich Netflix schauen, Tropenfrüchte essen, Billigmode tragen – die meisten Treibhausgas-Emissionen entstehen durch importierte Güter und Dienstleistungen. Eine Tagung an der Universität Bern rückt diese «g...

Netflix schauen, Tropenfrüchte essen, Billigmode tragen – die meisten Treibhausgas-Emissionen entstehen durch importierte Güter und Dienstleistungen. Eine Tagung an der Universität Bern rückt diese «grauen Emissionen» ins Zentrum. Donnerstag, 30. Oktober.
www.uniaktuell.unibe.ch/2025/klimasc...

By linking Antarctic sea ice, cloud cover, deep ocean temperatures, and global warming, our new study led by @linusvogt.bsky.social finds that ocean heat uptake and thermal sea level rise by 2100 could be 3–14% higher, and global surface warming 3–7% greater than previously thought👇

You can still apply!
If you know someone who might be interested, tell her or him about this! 🌊

Global map showing sea surface temperature anomalies in August 2025 relative to 1982 to 2010. Most areas are warmer than average. Red is shown for warmer sea surface temperatures, and blue is shown for colder sea surface temperatures. Data is from NOAA OISSTv2.1.

The massive extreme marine heatwave continues to stretch across the entire northern Pacific Ocean. In fact, the magnitude of the sea surface temperature anomalies even grew in August 2025 compared to earlier in the summer. Yikes... 🫠

Data from OISSTv2.1 (psl.noaa.gov/data/gridded...). 🌊

Full Professorship (W3) for Physics of the Oceans - Potsdam-Mittelmark, Brandenburg (DE) job with Universität Potsdam | 12844582 Founded in 1991, the University of Potsdam has firmly established itself in the scientific landscape and has become an outstanding economic factor ...

Here‘s a rare and excellent career opportunity for outstanding physical oceanographers at the Potsdam Institute (PIK) and the University of Potsdam, in beautiful surroundings just outside Berlin. Tell qualified friends or colleagues! 🌊
www.nature.com/naturecareer...

🌊 Nacht der Forschung 2025 | University of Bern 🌊
What a fantastic evening! Thank you to the entire ocean modeling team and friends for their incredible effort. For one night, the Kuppelraum transformed into a "true" ocean, full of energy, visited by many, and filled with inspiring conversations.

Thomas Frölicher

Der Weltklimarat ‪@ipcc.bsky.social‬ hat Thomas Frölicher #unibern zum Koordinierenden Leitautor der Arbeitsgruppe I des nächsten Weltklimaberichts ernannt. Er leitet das Kapitel über #Kipppunkte im Erdsystem. Mehr über seine Forschung: www.uniaktuell.unibe.ch/2025/uno_oze....
@froeltho.bsky.social

🚨 Our latest paper on how #climatechange will affect the distribution of shared fish stocks like #tuna and #billfishes across international borders is out now! 🐟🌍

Read the #OpenAccess article & IOF story below 👇

www.science.org/doi/10.1126/...

Ozean am Limit: Die globale Ozeantemperatur hat acht Jahre in Folge den Vorjahresrekord übertroffen – auch 2025 dürfte ein neuer Höchstwert folgen.

8 Jahre, 8 #Hitzerekorde im #Ozean – 2025 dürfte der nächste folgen. Klimaforscher Thomas Frölicher erklärt, warum das auch die #Schweiz betrifft und wo dennoch Hoffnung besteht: www.uniaktuell.unibe.ch/2025/uno_oze....

@froeltho.bsky.social

Have you ever wondered why a landlocked country like Switzerland should care about the health of the ocean? Check out our new 2-pager👇

Frölicher, T., & Jaccard, S. (2025). Why Switzerland Needs a Healthy Ocean: Global Interdependence and National Responsibility. Zenodo. lnkd.in/eMp5hN5d

Thank you, David!

New work by Lester Kwiatkowski and colleagues suggests that the reduction in coral reef calcification due to climate change may end up enhancing the ocean carbon sink by up to 1.25 Gt CO2 yr-1 by mid century (by even more by 2300) 🌊

www.pnas.org/doi/full/10....

A large number of products are available here: kdrive.infomaniak.com/app/share/20...
- Recommendations to Heads of State and Governments, summary in 6 UN languages
- Urgent call for coral reefs
- Policy brief "Knowledge for a thriving ocean"
- Manifesto
- Correspondence on US federal cuts 🌊
#OOSC

‼️ Please disseminate widely: the manifesto of the One Ocean Science Congress #OOSC is open for digital signature:
forms.ifremer.fr/pdg/oosc-man...

#ScienceForTheOcean 🌊

My co-chair François Houllier and I are delighted with this resounding success, after 2 years of preparation and many hurdles to overcome.

The recommendations will be presented to Heads of State and Governments tomorrow, the day before #UNOC starts.

#OOSC #ScienceForTheOcean

The One Ocean Science Congress has started! Exciting four days ahead #OOSC25

US federal cuts threaten international ocean science and diplomacy - Nature Ecology & Evolution Nature Ecology & Evolution - US federal cuts threaten international ocean science and diplomacy

Our new paper authored by the Scientific Committee of the
#OOSC on "US federal cuts threaten international ocean science and diplomacy" has been published. www.nature.com/articles/s41...

This is phenomenal.

Sea surface temperatures are >5C above average to the west of the UK and around Iceland. It's the strongest area of anomalous warmth on the planet at the moment.

It's the warmest in recorded history for northwest Europe.

#standupforscience2025. The sidewalk open house and NASA GISS swag giveaway is on at 2880 Broadway NY NY til 4 pm ET. Photos from a NASA scientist. 🌎🧪 matters.

I also can‘t see any indication at the moment that this would be temporary.

New study led by @lilianschuster.bsky.social finds that temporarily overshooting +1.5°C leads to irreversible glacier loss and long-term changes in water runoff. Some fast-responding glaciers may regrow, but this could lead to water scarcity centuries later, a phenomenon called ‘trough water’.👇

How little we’ve seen: A visual coverage estimate of the deep seafloor In decades of deep-sea exploration, humans have observed only 0.001% of the deep seafloor, leaving 66% of planet Earth unseen.

Sixty-six percent of the entire planet is deep ocean (≥200 m), and a new study shows that less than 0.001%, a total area approximately a tenth of the size of 🇨🇭 has been visualized observed. There is soooo much to be discovered! www.science.org/doi/10.1126/...

Really enjoyed the discussion on communicating tipping points at NASA GISS! It’s a tough topic, but I agree with the panel—we can do better than we have so far. Thanks for organizing it @aromanou.bsky.social and colleagues!

Compound events in the (subsurface) ocean and how they change under climate change. 👇

A dynamical geography of observed trends in the global ocean An empirical analysis of upper ocean physics reveals the factors that shape the seascape evolution in response to global warming.

Here a new point of view on the response of the global ocean to climate change.

In short: we cannot separate temperature from the rest when we look at trends in the dynamics.

It is just a starting point. With the great Bruno Buongiorno Nardelli.

www.science.org/doi/10.1126/...

Am 29. April sprechen Alexander Proelss und Thomas Frölicher über „Meeres-Wissenschaften und Internationales Recht im Klimawandel“.

🗓️ 29. April | 🕓 16:15–17:45
📍 Hörsaal 001, Kollegienhaus, Universität Basel

2. A poster on the ocean heat redistribution response to long temperature stabilization simulations at different global warming levels —> Thursday 14:00-15:45 X4.37 in OS1.13 (ocean carbon/heat session) meetingorganizer.copernicus.org/EGU25/EGU25-...

In the train to Vienna for #EGU25, first international conference since maternity leave! I will present:

1. AERA-MIP results on emission pathways and budgets compatible with 1.5 and 2C global warming —> Tuesday at 14:05 in CL4.13 (TCRE/ZEC session) meetingorganizer.copernicus.org/EGU25/EGU25-...

Extreme compound events in the equatorial and South Atlantic - Nature Communications The co-occurrence of marine heatwaves with extremes of high acidity and low chlorophyll concentrations has increased dramatically over the past two decades in the equatorial and South Atlantic. El Niñ...

🌊🌡️ In this study published @natcomms.nature.com, we analysed the simultaneous occurrence of marine heatwaves with extreme events of high acidity and net primary productivity in the equatorial and South Atlantic. Why is this important? A short 🧵...

www.nature.com/articles/s41...