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Marius Årthun

@mariusarthun

Researcher at the Geophysical Institute, UiB, and research leader at the Bjerknes Centre for Climate Research, Bergen. Working on ocean circulation/climate dynamics in the Arctic-Atlantic region.

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20.11.2024
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Latest posts by Marius Årthun @mariusarthun

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🧪🌊 Become a researcher within physical ocenography in the Arctic Ocean & the North Atlantic!
In our series with available positions, next one out is this one connected to the national research program @arcticocean2050.bsky.social
Supervisor: @mariusarthun.bsky.social
Come join us in Bergen!

23.02.2026 13:19 👍 2 🔁 6 💬 0 📌 0
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The Arctic overturning circulation: transformations, pathways and timescales Abstract. The Arctic is the northernmost terminus of the Atlantic Meridional Overturning Circulation and is an important source of the densest waters feeding its lower limb. However, relatively little...

🌊Where and how is dense water in the Arctic formed? In our new paper, we decompose the Arctic overturning circulation (ArMOC), the northernmost part of the AMOC. Check it out 🔽

@bjerknes.uib.no @mariusarthun.bsky.social @kristoferdoos.bsky.social @nansensenteret.bsky.social @noc.ac.uk

13.02.2026 09:47 👍 24 🔁 10 💬 1 📌 2
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PhD Research Fellow in physical oceanography (295159) | University of Bergen Job title: PhD Research Fellow in physical oceanography (295159), Employer: University of Bergen, Deadline: Monday, March 16, 2026

Come join us! PhD position at @unibergen.bsky.social and @bjerknes.uib.no on freshwater transport from the Arctic Ocean and its impacts on the Nordic Seas and subpolar overturning circulation. The position is part of the national Arctic Ocean 2050 program.

www.jobbnorge.no/en/available...

09.02.2026 10:09 👍 7 🔁 10 💬 0 📌 1
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A Highway of Heat to the Arctic: Why a Vital Ocean Current Is Losing Its Chill This blog post and the “Deep Dive” podcast, created by NotebookLM, are based on “Reduced cooling in the Norwegian Atlantic Slope Current: investigating mechanisms of change from 30 years of observa…

Thirty years of in situ observations indicate that a vital ocean current is losing its chill, transporting warmer water to the Arctic. 🌊🧪 ocean2climate.org/2026/01/05/a...

05.01.2026 14:32 👍 19 🔁 15 💬 2 📌 2
Line graph time series of 2025's daily Arctic sea ice extent compared to each year from 1979 to 2024 as shown with thin lines in colors from purple to white. There is large daily variability, but a long-term decreasing trend during all months of the year. A seasonal cycle is also visible in this region.

Line graph time series of 2025's daily Arctic sea ice extent compared to each year from 1979 to 2024 as shown with thin lines in colors from purple to white. There is large daily variability, but a long-term decreasing trend during all months of the year. A seasonal cycle is also visible in this region.

Ice-free conditions continue in the Barents Sea region of the #Arctic Ocean. This is one area that has observed some of the largest losses of ice over the last few decades... compare the older years (dark/purple lines) to today!

Map of this region: zacklabe.files.wordpress.com/2022/08/b203...

22.10.2025 11:54 👍 100 🔁 55 💬 4 📌 4
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How will a sudden change in the function of the ocean circulations impact Iceland, Europe, and the world?

We had a great panel at the Arctic Circle Assembly 🌊🧪

It was a scientific discussion on the likelihood, uncertainties, and possible consequences if the large ocean circulation were to shift.

17.10.2025 11:23 👍 13 🔁 5 💬 1 📌 0
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Ocean anomalies traveling North crucial for the Atlantic Meridional Overturning Circulation - Stockholm University Anomalies in temperature and salinity that originate in the midlatitude North Atlantic can affect the Atlantic Meridional Overturning Circulation (AMOC) in the Nordic Seas up to a decade later. The st...

Newly published study led by @leonchafik.bsky.social finds that anomalies in temperature and salinity that originate in the midlatitude North Atlantic can affect the #AMOC in the Nordic Seas up to a decade later.❗️ 🌊

Read the full press release below.
@stockholm-uni.bsky.social

15.08.2025 11:19 👍 18 🔁 4 💬 1 📌 1

Nice paper led by @leonchafik.bsky.social on the North Atlantic-Nordic Seas overturning circulation.

29.07.2025 06:53 👍 8 🔁 2 💬 0 📌 1
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Loss of sea ice stabilizes Atlantic circulation The risk of a slowdown of the overturning circulation in the North Atlantic Ocean is lower than previously thought. New research suggests increased deep…

Popular science summary: bjerknes.uib.no/en/news/tap-...

14.07.2025 14:19 👍 1 🔁 0 💬 0 📌 0
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Atlantification drives recent strengthening of the Arctic overturning circulation A less ice-covered Arctic shifts dense water formation northward, strengthening the Arctic Ocean overturning circulation.

The Arctic Ocean acts to stabilize the AMOC

New paper in #ScienceAdvances by researchers from @bjerknes.uib.no and @oxuniearthsci.bsky.social showing how ongoing Atlantification and sea ice loss leads to a strengthening of the Arctic overturning circulation.

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

14.07.2025 14:18 👍 13 🔁 7 💬 1 📌 1

Very cool article about Kjetil Våge’s ROVER project and how the Nordic Seas could help to decide the fate of the AMOC.

@bjerknes.uib.no

18.06.2025 15:57 👍 9 🔁 3 💬 0 📌 0
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New Book:
The Barents Sea system
Gateway to the changing Arctic

Happy to contribute to some sections of this exciting book!

fagbokforlaget.no/produkt/9788...

27.05.2025 19:32 👍 1 🔁 2 💬 0 📌 0

Er Golfstrømmen på vei til å gå amok? Vi tar pulsen på havstrømmene våre neste uke (torsdag) på klimafestivalen Varmere Våtere Villere. Kan de stoppe opp?

@bjerknes.bsky.social

www.varmerevaterevillere.no/programovers...

08.03.2025 07:44 👍 4 🔁 0 💬 0 📌 0
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New study: The northern Barents Sea could be seven degrees warmer in 2050 The Barents Sea is heading toward an ice-free future, researchers report.

Popular science summary:
www.sciencenorway.no/arctic-clima...

24.02.2025 13:39 👍 2 🔁 1 💬 0 📌 0
The future Barents Sea—A synthesis of physical, biogeochemical, and ecological changes toward 2050 and 2100 The Barents Sea is a hotspot for ongoing Arctic climate change, manifested in a rapid warming of the ocean and the atmosphere and a strong decline of the winter sea-ice cover. These changes in the phy...

New paper: The future Barents Sea-A synthesis of physical, biogeochemical, and ecological changes toward 2050 and 2100

Very nice interdisiplinary Nansen Legacy effort, including @jakobdoerr.bsky.social @islarsh.bsky.social @khuongdinh.bsky.social

doi.org/10.1525/elem...

24.02.2025 13:38 👍 10 🔁 4 💬 2 📌 0
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Help Denmark Buy California – Because Why Not? Buy it from Trump, the bigliest crowdsourcing ever

Brilliant! Help Denmark buy California! Because why not...? denmarkification.com

12.02.2025 15:37 👍 1 🔁 1 💬 0 📌 0

Deadline day tomorrow! Solicited talk by @rahmstorf.bsky.social about future AMOC weakening.

14.01.2025 18:42 👍 2 🔁 0 💬 0 📌 0
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Buoys on Expedition in the Arctic Ocean Two instrument-laden buoys ("Knoll" and "Tott") were recently released north of Svalbard, soon to disappear beneath the ice.

In our project "Overturning circulation in the new Arctic" (ArMOC) we have deployed two Argo floats in the Arctic (north of Svalbard). A short story on the mission of Knoll & Tott here:

bjerknes.uib.no/en/article/n...

With Stefanie Semper, Birgit Rinde and @jakobdoerr.bsky.social

12.12.2024 15:27 👍 6 🔁 1 💬 0 📌 0
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And for those interested in future ocean circulation changes. Join us at #EGU25 to find out more.

meetingorganizer.copernicus.org/EGU25/sessio...

03.12.2024 17:54 👍 1 🔁 0 💬 0 📌 1

Could the AMOC collapse and Bergen become 20 degrees colder (imagine the snow we would get!)? This and more in the latest Bjerknes podcast.

03.12.2024 16:53 👍 5 🔁 1 💬 1 📌 0

The Barents Sea is a hotspot for ongoing Arctic climate change and could be 7C warmer by 2100. Check out our amazing fact sheets from the Nansen Legacy project! arvenetternansen.com/fact-sheets-...

22.11.2024 19:22 👍 8 🔁 5 💬 0 📌 0

A good opportunity for a first post. Come work with us!

21.11.2024 18:15 👍 8 🔁 9 💬 0 📌 2