Jens Terhaar
@polarocean.bsky.social
Father of 3, ocean biogeochemical modeller at the University of Bern, interested in high-latitude oceans, carbon cycle, ocean-climate interaction & ecosystem stressors such as ocean acidification and primary production.
Pinned
Jens Terhaar
@polarocean.bsky.social
· Nov 14
It is a great honor to receive the 2025 Division Outstanding Early Career Scientist Award in Ocean Science.
This would not have been possible without the many friends and colleagues who accompanied, taught, helped, and advised me during this journey.
This would not have been possible without the many friends and colleagues who accompanied, taught, helped, and advised me during this journey.
Reposted by Jens Terhaar
1,600+ fossil fuel lobbyists at COP30, outnumbering every delegation except Brazil
This isn’t ‘dialogue’; it’s the industry responsible for the crisis hijacking the negotiations meant to stop it
If this doesn’t make you furious, you’re not paying attention
www.theguardian.com/environment/...
This isn’t ‘dialogue’; it’s the industry responsible for the crisis hijacking the negotiations meant to stop it
If this doesn’t make you furious, you’re not paying attention
www.theguardian.com/environment/...
Fossil fuel lobbyists outnumber all Cop30 delegations except Brazil, report says
One in every 25 participants at 2025 UN climate summit is a fossil fuel lobbyist, according to Kick Big Polluters Out
www.theguardian.com
November 14, 2025 at 6:12 AM
1,600+ fossil fuel lobbyists at COP30, outnumbering every delegation except Brazil
This isn’t ‘dialogue’; it’s the industry responsible for the crisis hijacking the negotiations meant to stop it
If this doesn’t make you furious, you’re not paying attention
www.theguardian.com/environment/...
This isn’t ‘dialogue’; it’s the industry responsible for the crisis hijacking the negotiations meant to stop it
If this doesn’t make you furious, you’re not paying attention
www.theguardian.com/environment/...
Reposted by Jens Terhaar
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👇
🚨🌊 New highlight paper out today in Earth System Dynamics!
We find an observational constraint implying more future global ocean heat uptake, cloud feedback, and warming than the CMIP6 mean.
This contrasts with previous estimates based on past warming trends.
🔗 esd.copernicus.org/articles/16/...
We find an observational constraint implying more future global ocean heat uptake, cloud feedback, and warming than the CMIP6 mean.
This contrasts with previous estimates based on past warming trends.
🔗 esd.copernicus.org/articles/16/...
Increased future ocean heat uptake constrained by Antarctic sea ice extent
Abstract. The ocean takes up over 90 % of the excess heat stored in the Earth system as a result of anthropogenic climate change, which has led to sea level rise and an intensification of marine extre...
esd.copernicus.org
October 2, 2025 at 12:36 PM
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👇
And the associated press release for the highlight paper by Earth System Dynamics:
www.egu.eu/news/1505/an...
www.egu.eu/news/1505/an...
October 2, 2025 at 11:58 AM
And the associated press release for the highlight paper by Earth System Dynamics:
www.egu.eu/news/1505/an...
www.egu.eu/news/1505/an...
Reposted by Jens Terhaar
🚨🌊 New highlight paper out today in Earth System Dynamics!
We find an observational constraint implying more future global ocean heat uptake, cloud feedback, and warming than the CMIP6 mean.
This contrasts with previous estimates based on past warming trends.
🔗 esd.copernicus.org/articles/16/...
We find an observational constraint implying more future global ocean heat uptake, cloud feedback, and warming than the CMIP6 mean.
This contrasts with previous estimates based on past warming trends.
🔗 esd.copernicus.org/articles/16/...
Increased future ocean heat uptake constrained by Antarctic sea ice extent
Abstract. The ocean takes up over 90 % of the excess heat stored in the Earth system as a result of anthropogenic climate change, which has led to sea level rise and an intensification of marine extre...
esd.copernicus.org
October 2, 2025 at 10:49 AM
🚨🌊 New highlight paper out today in Earth System Dynamics!
We find an observational constraint implying more future global ocean heat uptake, cloud feedback, and warming than the CMIP6 mean.
This contrasts with previous estimates based on past warming trends.
🔗 esd.copernicus.org/articles/16/...
We find an observational constraint implying more future global ocean heat uptake, cloud feedback, and warming than the CMIP6 mean.
This contrasts with previous estimates based on past warming trends.
🔗 esd.copernicus.org/articles/16/...
And of course, I forgot the wave 🌊 to add it to the oceanography feed.
So here is the post about this paper, which was published today, and highlights how the deep ocean impacts future atmospheric and ocean warming.
We also show that future warming might be underestimated by past studies!
So here is the post about this paper, which was published today, and highlights how the deep ocean impacts future atmospheric and ocean warming.
We also show that future warming might be underestimated by past studies!
Future atmospheric and ocean warming over the 21st century might be larger than previously expected based on a new study by @linusvogt.bsky.social
Linus & I developed the idea during Linus research visit with me at @whoi.edu and turned it then into this paper:
esd.copernicus.org/articles/16/...
Linus & I developed the idea during Linus research visit with me at @whoi.edu and turned it then into this paper:
esd.copernicus.org/articles/16/...
Increased future ocean heat uptake constrained by Antarctic sea ice extent
Abstract. The ocean takes up over 90 % of the excess heat stored in the Earth system as a result of anthropogenic climate change, which has led to sea level rise and an intensification of marine extre...
esd.copernicus.org
October 2, 2025 at 9:34 AM
And of course, I forgot the wave 🌊 to add it to the oceanography feed.
So here is the post about this paper, which was published today, and highlights how the deep ocean impacts future atmospheric and ocean warming.
We also show that future warming might be underestimated by past studies!
So here is the post about this paper, which was published today, and highlights how the deep ocean impacts future atmospheric and ocean warming.
We also show that future warming might be underestimated by past studies!
Future atmospheric and ocean warming over the 21st century might be larger than previously expected based on a new study by @linusvogt.bsky.social
Linus & I developed the idea during Linus research visit with me at @whoi.edu and turned it then into this paper:
esd.copernicus.org/articles/16/...
Linus & I developed the idea during Linus research visit with me at @whoi.edu and turned it then into this paper:
esd.copernicus.org/articles/16/...
Increased future ocean heat uptake constrained by Antarctic sea ice extent
Abstract. The ocean takes up over 90 % of the excess heat stored in the Earth system as a result of anthropogenic climate change, which has led to sea level rise and an intensification of marine extre...
esd.copernicus.org
October 2, 2025 at 9:20 AM
Future atmospheric and ocean warming over the 21st century might be larger than previously expected based on a new study by @linusvogt.bsky.social
Linus & I developed the idea during Linus research visit with me at @whoi.edu and turned it then into this paper:
esd.copernicus.org/articles/16/...
Linus & I developed the idea during Linus research visit with me at @whoi.edu and turned it then into this paper:
esd.copernicus.org/articles/16/...
It's scary how fast the earth is warming.
For a long time, the 🌊 ocean surface was warming at a slower 🐌 rate but the warming rate appears to have caught up 🐇.
➡️ In our study about the jump in SSTs, we also estimated a 0.27°C per decade warming of global SSTs (www.nature.com/articles/s41...)
For a long time, the 🌊 ocean surface was warming at a slower 🐌 rate but the warming rate appears to have caught up 🐇.
➡️ In our study about the jump in SSTs, we also estimated a 0.27°C per decade warming of global SSTs (www.nature.com/articles/s41...)
June 19, 2025 at 9:04 AM
It's scary how fast the earth is warming.
For a long time, the 🌊 ocean surface was warming at a slower 🐌 rate but the warming rate appears to have caught up 🐇.
➡️ In our study about the jump in SSTs, we also estimated a 0.27°C per decade warming of global SSTs (www.nature.com/articles/s41...)
For a long time, the 🌊 ocean surface was warming at a slower 🐌 rate but the warming rate appears to have caught up 🐇.
➡️ In our study about the jump in SSTs, we also estimated a 0.27°C per decade warming of global SSTs (www.nature.com/articles/s41...)
Informative and interesting news feature in @nature.com about the AMOC & large existing uncertainties about its past & future by @timkalvelage.bsky.social who accompanied oceanographer Kjetil Våge from @bjerknes.uib.no on the Norwegian ice-breaker RV Kronprins Haakon.
www.nature.com/articles/d41...
www.nature.com/articles/d41...
Is a monster web of ocean currents headed for collapse? The race is on to find out
Research ships rarely brave the Greenland Sea in winter. Early this year, scientists ventured into the ice-covered waters to capture crucial data about the planet’s future.
www.nature.com
June 19, 2025 at 8:48 AM
Informative and interesting news feature in @nature.com about the AMOC & large existing uncertainties about its past & future by @timkalvelage.bsky.social who accompanied oceanographer Kjetil Våge from @bjerknes.uib.no on the Norwegian ice-breaker RV Kronprins Haakon.
www.nature.com/articles/d41...
www.nature.com/articles/d41...
Reposted by Jens Terhaar
Updated Climate Visuals
(1) Warming stripes for atmosphere and ocean
(2) Climate indicators (adding land humidity for 2024)
(3) UK climate indicators (adding some 2024 data)
ed-hawkins.github.io/climate-visu...
(1) Warming stripes for atmosphere and ocean
(2) Climate indicators (adding land humidity for 2024)
(3) UK climate indicators (adding some 2024 data)
ed-hawkins.github.io/climate-visu...
May 12, 2025 at 8:27 AM
Updated Climate Visuals
(1) Warming stripes for atmosphere and ocean
(2) Climate indicators (adding land humidity for 2024)
(3) UK climate indicators (adding some 2024 data)
ed-hawkins.github.io/climate-visu...
(1) Warming stripes for atmosphere and ocean
(2) Climate indicators (adding land humidity for 2024)
(3) UK climate indicators (adding some 2024 data)
ed-hawkins.github.io/climate-visu...
Reposted by Jens Terhaar
We explained what caused the unusual winds (persistence of NAO- conditions and blocking syste over the British Isles) and showed also that the key factor that boosted this event is the long-term stratification which is linked to anthropogenic activities.
May 13, 2025 at 7:01 PM
We explained what caused the unusual winds (persistence of NAO- conditions and blocking syste over the British Isles) and showed also that the key factor that boosted this event is the long-term stratification which is linked to anthropogenic activities.
Reposted by Jens Terhaar
If I can add something. Here we demonstrate that NATL warming was due to natural variability. The event was excepted and in line with climate projections (return period around 10 years). The processes are well known and we can explain it.
www.nature.com/articles/s43...
www.nature.com/articles/s43...
Internal variability effect doped by climate change drove the 2023 marine heat extreme in the North Atlantic - Communications Earth & Environment
The 2023 North Atlantic marine heatwave was driven by an extreme phase of internal atmospheric variability but would have been impossible without the doping effect of anthropogenic warming, according ...
www.nature.com
May 13, 2025 at 6:54 PM
If I can add something. Here we demonstrate that NATL warming was due to natural variability. The event was excepted and in line with climate projections (return period around 10 years). The processes are well known and we can explain it.
www.nature.com/articles/s43...
www.nature.com/articles/s43...
Reposted by Jens Terhaar
Important new article in @nature.com:
"...the record-shattering jump in surface ocean temperatures in 2023–2024 was an extreme event after which surface ocean temperatures are expected to revert to the expected long-term warming trend."
#TruthIsBadEnough
(h/t @flowinguphill.bsky.social)
"...the record-shattering jump in surface ocean temperatures in 2023–2024 was an extreme event after which surface ocean temperatures are expected to revert to the expected long-term warming trend."
#TruthIsBadEnough
(h/t @flowinguphill.bsky.social)
Why have the sea surface temperature suddenly risen in 2023/24? 🌊
Is it true that climate models cannot simulate such SST jumps? What is common to such jumps? How will SSTs evolve over the next months and years? Are we in uncharted territory? More from our recent study in Nature is here👇
Is it true that climate models cannot simulate such SST jumps? What is common to such jumps? How will SSTs evolve over the next months and years? Are we in uncharted territory? More from our recent study in Nature is here👇
Record sea surface temperature jump in 2023–2024 unlikely but not unexpected - Nature
Observations and climate models suggest that the global sea surface temperature jump in 2023–2024 was not unexpected and would have been nearly impossible without anthropogenic warming.
www.nature.com
May 4, 2025 at 3:31 AM
Important new article in @nature.com:
"...the record-shattering jump in surface ocean temperatures in 2023–2024 was an extreme event after which surface ocean temperatures are expected to revert to the expected long-term warming trend."
#TruthIsBadEnough
(h/t @flowinguphill.bsky.social)
"...the record-shattering jump in surface ocean temperatures in 2023–2024 was an extreme event after which surface ocean temperatures are expected to revert to the expected long-term warming trend."
#TruthIsBadEnough
(h/t @flowinguphill.bsky.social)
Reposted by Jens Terhaar
One thing that really bothered me about this discussion was the number of speakers who insisted that the gov attacks on US science are "unprecedented". They're not. Nazi Germany, the Soviet Union, Iran, Turkey & more all purged their academy. Surely learning from that history is essential. #EGU25
Five minutes to go and already a very full room here for the final session of #EGU25 , a last-minute debate on “How should the global geoscience community respond to attacks on science”, focussed on the US.
It’s so incredibly sad that this is even necessary. But there is clearly will to act.
It’s so incredibly sad that this is even necessary. But there is clearly will to act.
May 3, 2025 at 8:53 AM
One thing that really bothered me about this discussion was the number of speakers who insisted that the gov attacks on US science are "unprecedented". They're not. Nazi Germany, the Soviet Union, Iran, Turkey & more all purged their academy. Surely learning from that history is essential. #EGU25
Reposted by Jens Terhaar
Much of the debate we've seen so far has posed Trump's attacks on science as an American problem - but it's not. It's a global problem. The stark reality is that US research underpins much of the world's science - and it's not just money. /1 www.nytimes.com/live/2025/05...
Trump’s plan proposes sweeping cuts to climate and renewable energy programs.
www.nytimes.com
May 2, 2025 at 9:25 PM
Much of the debate we've seen so far has posed Trump's attacks on science as an American problem - but it's not. It's a global problem. The stark reality is that US research underpins much of the world's science - and it's not just money. /1 www.nytimes.com/live/2025/05...
Reposted by Jens Terhaar
🧵 There’s been ongoing debate about the AMOC and what models really say about its collapse risk this century and beyond.
Here’s a short thread responding to Stefan Rahmstorf’s recent comments on Science in Action (BBC) 🌊
Here’s a short thread responding to Stefan Rahmstorf’s recent comments on Science in Action (BBC) 🌊
May 2, 2025 at 1:32 PM
🧵 There’s been ongoing debate about the AMOC and what models really say about its collapse risk this century and beyond.
Here’s a short thread responding to Stefan Rahmstorf’s recent comments on Science in Action (BBC) 🌊
Here’s a short thread responding to Stefan Rahmstorf’s recent comments on Science in Action (BBC) 🌊
Reposted by Jens Terhaar
Let's use bgcArgo floats to evaluat ocean biogeochemistry models!
Simone Le Chevere:
Evaluation of the interior ocean ventilation of biogeochemical tracers in a global ocean model using observation-based metrics
Thursday, 16:48–16:58, Room 1.34
#EGU25
@awi.de @erc.europa.eu #OceanPeak
Simone Le Chevere:
Evaluation of the interior ocean ventilation of biogeochemical tracers in a global ocean model using observation-based metrics
Thursday, 16:48–16:58, Room 1.34
#EGU25
@awi.de @erc.europa.eu #OceanPeak
April 28, 2025 at 7:07 AM
Let's use bgcArgo floats to evaluat ocean biogeochemistry models!
Simone Le Chevere:
Evaluation of the interior ocean ventilation of biogeochemical tracers in a global ocean model using observation-based metrics
Thursday, 16:48–16:58, Room 1.34
#EGU25
@awi.de @erc.europa.eu #OceanPeak
Simone Le Chevere:
Evaluation of the interior ocean ventilation of biogeochemical tracers in a global ocean model using observation-based metrics
Thursday, 16:48–16:58, Room 1.34
#EGU25
@awi.de @erc.europa.eu #OceanPeak
Reposted by Jens Terhaar
#EGU25
🌊 Come have a chat now and before 4pm at X4.37, I have cookies!
🗣Additionally I now have a last-minute talk at 17:43 today in room 1.34 in the same session
🌊 Come have a chat now and before 4pm at X4.37, I have cookies!
🗣Additionally I now have a last-minute talk at 17:43 today in room 1.34 in the same session
May 1, 2025 at 11:52 AM
#EGU25
🌊 Come have a chat now and before 4pm at X4.37, I have cookies!
🗣Additionally I now have a last-minute talk at 17:43 today in room 1.34 in the same session
🌊 Come have a chat now and before 4pm at X4.37, I have cookies!
🗣Additionally I now have a last-minute talk at 17:43 today in room 1.34 in the same session
It appears that there have unfortunately been some misunderstandings about our recent paper about the Atlantic Meridional Overturning Circulation (www.nature.com/articles/s41...) at #EGU25. I have tried to clarify these here: www.linkedin.com/feed/update/...
Atlantic overturning inferred from air-sea heat fluxes indicates no decline since the 1960s - Nature Communications
The AMOC is crucial for the global ocean overturning circulation and controls the climate around the North Atlantic. Here, the authors use 24 Earth System Models from the CMIP6 to demonstrate tha...
www.nature.com
May 1, 2025 at 9:10 AM
It appears that there have unfortunately been some misunderstandings about our recent paper about the Atlantic Meridional Overturning Circulation (www.nature.com/articles/s41...) at #EGU25. I have tried to clarify these here: www.linkedin.com/feed/update/...
Yesterday, I received the Ocean Science Outstanding Early Career Scientist Award at #EGU25.
I am very grateful for this recognition about my work on the ocean carbon cycle, ocean biogeochemistry, earth system modeling, ocean-climate interactions, climate projections, and physical oceanography.
I am very grateful for this recognition about my work on the ocean carbon cycle, ocean biogeochemistry, earth system modeling, ocean-climate interactions, climate projections, and physical oceanography.
April 30, 2025 at 8:56 AM
Yesterday, I received the Ocean Science Outstanding Early Career Scientist Award at #EGU25.
I am very grateful for this recognition about my work on the ocean carbon cycle, ocean biogeochemistry, earth system modeling, ocean-climate interactions, climate projections, and physical oceanography.
I am very grateful for this recognition about my work on the ocean carbon cycle, ocean biogeochemistry, earth system modeling, ocean-climate interactions, climate projections, and physical oceanography.
Reposted by Jens Terhaar
🌊 Great medal and award lecture at #EGU25!
Congrats to @tatianailyina.bsky.social for receiving the Fridtjof Nansen Medal and @polarocean.bsky.social for the Outstanding ECS Award for their outstanding work in oceanography👏 Truly great scientists!
Check out the interviews:
bit.ly/3ScAwQp
@egu.eu
Congrats to @tatianailyina.bsky.social for receiving the Fridtjof Nansen Medal and @polarocean.bsky.social for the Outstanding ECS Award for their outstanding work in oceanography👏 Truly great scientists!
Check out the interviews:
bit.ly/3ScAwQp
@egu.eu
April 29, 2025 at 8:58 PM
🌊 Great medal and award lecture at #EGU25!
Congrats to @tatianailyina.bsky.social for receiving the Fridtjof Nansen Medal and @polarocean.bsky.social for the Outstanding ECS Award for their outstanding work in oceanography👏 Truly great scientists!
Check out the interviews:
bit.ly/3ScAwQp
@egu.eu
Congrats to @tatianailyina.bsky.social for receiving the Fridtjof Nansen Medal and @polarocean.bsky.social for the Outstanding ECS Award for their outstanding work in oceanography👏 Truly great scientists!
Check out the interviews:
bit.ly/3ScAwQp
@egu.eu
At #EGU25, I gave an interview with respect to the Ocean Sciences @egu.eu #EarlyCareer Award.
It is about my past, present and future science and also being a parent in academia!
If you want to hear more, please come to my medal lecture tomorrow: meetingorganizer.copernicus.org/EGU25/sessio...
It is about my past, present and future science and also being a parent in academia!
If you want to hear more, please come to my medal lecture tomorrow: meetingorganizer.copernicus.org/EGU25/sessio...
Jens Terhaar Receives the Division Outstanding Early Career Scientist Award – About His Career and Work
Jens Terhaar received the 2025 Division Outstanding Early Career Scientist Award for his research on the ocean carbon cycle and its effects on climate. We spoke with him about his career path and the ...
blogs.egu.eu
April 28, 2025 at 12:52 PM
At #EGU25, I gave an interview with respect to the Ocean Sciences @egu.eu #EarlyCareer Award.
It is about my past, present and future science and also being a parent in academia!
If you want to hear more, please come to my medal lecture tomorrow: meetingorganizer.copernicus.org/EGU25/sessio...
It is about my past, present and future science and also being a parent in academia!
If you want to hear more, please come to my medal lecture tomorrow: meetingorganizer.copernicus.org/EGU25/sessio...
Reposted by Jens Terhaar
Attending #EGU @egu.eu & care about mental health & diversity in academia? Join our Union Symposium Monday, 16:15–18:00 in Room E1. Co-organized with @polarocean.bsky.social @geocarolina.bsky.social Sabine Hörnig and Anita Di Chiara. Read more on @lucialayr.bsky.social blog post @egubg.bsky.social
Highlighted event: Opening up about Mental Health across Career Stages in the Geosciences
EGU 2025 is almost upon us! While a highlight of the year for many scientists, a big conference like this can also come with feelings of stress or anxiety for many. (If that’s you – you are not alone!...
blogs.egu.eu
April 24, 2025 at 6:18 PM
Attending #EGU @egu.eu & care about mental health & diversity in academia? Join our Union Symposium Monday, 16:15–18:00 in Room E1. Co-organized with @polarocean.bsky.social @geocarolina.bsky.social Sabine Hörnig and Anita Di Chiara. Read more on @lucialayr.bsky.social blog post @egubg.bsky.social
Reposted by Jens Terhaar
Moreover, this is part of a broader framework (see @polarocean.bsky.social 's publi) in which the mutual responses of internal variability and long-term trends allow such events to occur. The study of extremes also raises the question of impacts, adaptation & anticipation
tinyurl.com/2mstn48a
12/14
tinyurl.com/2mstn48a
12/14
Jens Terhaar (@polarocean.bsky.social)
Why have the sea surface temperature suddenly risen in 2023/24? 🌊
Is it true that climate models cannot simulate such SST jumps? What is common to such jumps? How will SSTs evolve over the next month...
tinyurl.com
April 16, 2025 at 1:16 PM
Moreover, this is part of a broader framework (see @polarocean.bsky.social 's publi) in which the mutual responses of internal variability and long-term trends allow such events to occur. The study of extremes also raises the question of impacts, adaptation & anticipation
tinyurl.com/2mstn48a
12/14
tinyurl.com/2mstn48a
12/14
Reposted by Jens Terhaar
🌊 The N.Atlantic has been experiencing extreme T°C in 2023. This situation raises a number of questions: Have we missed something? Do climate models allow us to understand such an event, or have we entered a new climate regime?
We attempted to answer these questions in this study:
rdcu.be/eh0e8
1/14
We attempted to answer these questions in this study:
rdcu.be/eh0e8
1/14
Internal variability effect doped by climate change drove the 2023 marine heat extreme in the North Atlantic
Communications Earth & Environment - The 2023 North Atlantic marine heatwave was driven by an extreme phase of internal atmospheric variability but would have been impossible without the doping...
rdcu.be
April 16, 2025 at 1:16 PM
🌊 The N.Atlantic has been experiencing extreme T°C in 2023. This situation raises a number of questions: Have we missed something? Do climate models allow us to understand such an event, or have we entered a new climate regime?
We attempted to answer these questions in this study:
rdcu.be/eh0e8
1/14
We attempted to answer these questions in this study:
rdcu.be/eh0e8
1/14