Nico Jourdain
@nicojourdain.bsky.social
CNRS researcher at IGE, Grenoble, France, working on the Antarctic Ice Sheet and its interactions with the climate system, sea level rise.
Reposted by Nico Jourdain
Sometimes we get lucky.
Nice article led by Steve Rintoul on new findings on the ocean melting the front of Denman Glacier
theconversation.com/what-our-mis...
Nice article led by Steve Rintoul on new findings on the ocean melting the front of Denman Glacier
theconversation.com/what-our-mis...
What our missing ocean float revealed about Antartica’s melting glaciers
Our ocean float spent years adrift in the Antarctic ocean and beneath massive ice shelves. What it found will help us estimate global sea-level rise.
theconversation.com
December 6, 2025 at 1:54 AM
Sometimes we get lucky.
Nice article led by Steve Rintoul on new findings on the ocean melting the front of Denman Glacier
theconversation.com/what-our-mis...
Nice article led by Steve Rintoul on new findings on the ocean melting the front of Denman Glacier
theconversation.com/what-our-mis...
Reposted by Nico Jourdain
Antarctica’s future beyond 2100: high emissions drive major long-term ice loss. New study in Nature Communications by Vio Coulon and Ann Kristin Klose, showing that the fate of the Antarctic ice sheet, will play a decisive role in future sea level rise.
www.nature.com/articles/s41...
www.nature.com/articles/s41...
From short-term uncertainties to long-term certainties in the future evolution of the Antarctic Ice Sheet - Nature Communications
Even if net-zero emissions are reached well before 2100, West Antarctic ice-sheet retreat could still drive multi-meter sea-level rise by 2300. Emission reductions in the coming years are critical to ...
www.nature.com
December 5, 2025 at 3:35 PM
Antarctica’s future beyond 2100: high emissions drive major long-term ice loss. New study in Nature Communications by Vio Coulon and Ann Kristin Klose, showing that the fate of the Antarctic ice sheet, will play a decisive role in future sea level rise.
www.nature.com/articles/s41...
www.nature.com/articles/s41...
Reposted by Nico Jourdain
🌊 1/ A robotic float has measured temperature and salinity from parts of the Southern Ocean never sampled before — underneath massive floating Denman and Shackleton ice shelves in East #Antarctica.
New in @science.org #ScienceAdvances: www.science.org/doi/10.1126/...
New in @science.org #ScienceAdvances: www.science.org/doi/10.1126/...
December 5, 2025 at 10:49 PM
🌊 1/ A robotic float has measured temperature and salinity from parts of the Southern Ocean never sampled before — underneath massive floating Denman and Shackleton ice shelves in East #Antarctica.
New in @science.org #ScienceAdvances: www.science.org/doi/10.1126/...
New in @science.org #ScienceAdvances: www.science.org/doi/10.1126/...
Reposted by Nico Jourdain
🌊 Storms in the Southern Ocean are producing more rain
👉 28% rainfall increase (vs ERA5’s 8%)
👉 Storm rain intensity up
👉 ~2,300 Gt/yr extra freshwater in 2023
👉 Ocean “cooling by evaporation” up 10–15%
One of Earth’s key climate buffers is shifting.
theconversation.com/storms-in-th...
👉 28% rainfall increase (vs ERA5’s 8%)
👉 Storm rain intensity up
👉 ~2,300 Gt/yr extra freshwater in 2023
👉 Ocean “cooling by evaporation” up 10–15%
One of Earth’s key climate buffers is shifting.
theconversation.com/storms-in-th...
Storms in the Southern Ocean are producing more rain – and the consequences could be global
The Southern Ocean is the engine room of global heat and carbon uptake – and it’s changing faster and more dramatically than we thought.
theconversation.com
December 5, 2025 at 5:47 AM
🌊 Storms in the Southern Ocean are producing more rain
👉 28% rainfall increase (vs ERA5’s 8%)
👉 Storm rain intensity up
👉 ~2,300 Gt/yr extra freshwater in 2023
👉 Ocean “cooling by evaporation” up 10–15%
One of Earth’s key climate buffers is shifting.
theconversation.com/storms-in-th...
👉 28% rainfall increase (vs ERA5’s 8%)
👉 Storm rain intensity up
👉 ~2,300 Gt/yr extra freshwater in 2023
👉 Ocean “cooling by evaporation” up 10–15%
One of Earth’s key climate buffers is shifting.
theconversation.com/storms-in-th...
Reposted by Nico Jourdain
Two miles of ice core on the shelf at our national ice core facility in Lakewood, Colorado. The WAIS Divide core from West Antarctica is a 3400m long (deepest US core, 2nd deepest ice core ever) 68,000 year old record of high resolution climate.
November 24, 2025 at 5:03 PM
Two miles of ice core on the shelf at our national ice core facility in Lakewood, Colorado. The WAIS Divide core from West Antarctica is a 3400m long (deepest US core, 2nd deepest ice core ever) 68,000 year old record of high resolution climate.
Reposted by Nico Jourdain
Timely research highlight on land-based carbon dioxide removal approches developped by a great team !
Check out our latest highlight on how we worked on the assessment of climate impacts of land-based CDR across three angles:
🔄Carbon cycle changes
🌳Impacts on local climate, agriculture and hydrology
📉The Socio-economic dimension: uncertainty and risks
👉bit.ly/4qMYPEy
#ESM2025research
🔄Carbon cycle changes
🌳Impacts on local climate, agriculture and hydrology
📉The Socio-economic dimension: uncertainty and risks
👉bit.ly/4qMYPEy
#ESM2025research
November 21, 2025 at 5:15 PM
Timely research highlight on land-based carbon dioxide removal approches developped by a great team !
Reposted by Nico Jourdain
The loudest voices don't always win: In 2023, a scientific paper in the field of #glaciology was suddenly thrown into the climate wars. I interviewed one of the co-authors @juliaandreasen.bsky.social and appreciate any reposts! [Thread]
mikeyoungacademy.dk/ice-sheet-or...
mikeyoungacademy.dk/ice-sheet-or...
Ice sheet or ice shelf: What’s the difference?
How a glaciology paper got pulled into the climate wars — and what you can learn from research that went viral for all the wrong reasons
mikeyoungacademy.dk
November 21, 2025 at 1:46 PM
The loudest voices don't always win: In 2023, a scientific paper in the field of #glaciology was suddenly thrown into the climate wars. I interviewed one of the co-authors @juliaandreasen.bsky.social and appreciate any reposts! [Thread]
mikeyoungacademy.dk/ice-sheet-or...
mikeyoungacademy.dk/ice-sheet-or...
The #ISMIP7 ice-ocean Antarctic focus group is recruiting a 2.5 year postdoc on ice-shelf basal melting at Northumbria University, Newcastle, UK. A great way to develop international collaborations and contribute to the improvement of sea level projections!
work4.northumbria.ac.uk#en/sites/CX_...
work4.northumbria.ac.uk#en/sites/CX_...
work4.northumbria.ac.uk
November 18, 2025 at 10:22 PM
The #ISMIP7 ice-ocean Antarctic focus group is recruiting a 2.5 year postdoc on ice-shelf basal melting at Northumbria University, Newcastle, UK. A great way to develop international collaborations and contribute to the improvement of sea level projections!
work4.northumbria.ac.uk#en/sites/CX_...
work4.northumbria.ac.uk#en/sites/CX_...
Reposted by Nico Jourdain
Clear explainer of the global oceanic Meridional Overturning Circulation: figshare.utas.edu.au/articles/rep...
What is the Meridional Overturning Circulation and why is it important?
The Meridional Overturning Circulation (MOC) is a system of ocean currents that circulate water across the globe. Just as blood circulation transports oxygen, nutrients and heat throughout our bodies,...
figshare.utas.edu.au
November 17, 2025 at 9:54 AM
Clear explainer of the global oceanic Meridional Overturning Circulation: figshare.utas.edu.au/articles/rep...
Reposted by Nico Jourdain
Now that the Sept and Oct data are (belatedly) in, it looks like 2025 will be the second warmest year in the record (~80% probability). The last three years are in a class of their own.
November 15, 2025 at 4:54 PM
Now that the Sept and Oct data are (belatedly) in, it looks like 2025 will be the second warmest year in the record (~80% probability). The last three years are in a class of their own.
Reposted by Nico Jourdain
Hey ice sheet types! 👋
The memes about the insane number of starter packs on this thing motivated me to create one more.
Please let me know who I am missing from the ice sheet world. 👇
go.bsky.app/4SxszWw
November 24, 2024 at 4:00 PM
Hey ice sheet types! 👋
The memes about the insane number of starter packs on this thing motivated me to create one more.
Please let me know who I am missing from the ice sheet world. 👇
go.bsky.app/4SxszWw
Reposted by Nico Jourdain
Happy to see this out! Meltwater can delay future surface warming, and its interannual variations impact ocean stratification & overturning. This effect is usually absent from models.
Including it as forcing may lead to more realistic simulation of surface temperature and sea ice trends🧊🌊 (1/7)
Including it as forcing may lead to more realistic simulation of surface temperature and sea ice trends🧊🌊 (1/7)
Finally out! The outcome of a virtual workshop in Feb 2024 with modelers and observationalists to put together data and protocols to include historical changes in ice sheet/ice shelf discharge in CMIP models. Hopefully not too late for some CMIP7 runs!
gmd.copernicus.org/articles/18/...
gmd.copernicus.org/articles/18/...
Datasets and protocols for including anomalous freshwater from melting ice sheets in climate simulations
Abstract. Anomalous freshwater fluxes from the Greenland and Antarctic ice sheets and ice shelves are impacting the surrounding oceans, and we need to be able to account for these effects in climate m...
gmd.copernicus.org
November 8, 2025 at 3:52 PM
Happy to see this out! Meltwater can delay future surface warming, and its interannual variations impact ocean stratification & overturning. This effect is usually absent from models.
Including it as forcing may lead to more realistic simulation of surface temperature and sea ice trends🧊🌊 (1/7)
Including it as forcing may lead to more realistic simulation of surface temperature and sea ice trends🧊🌊 (1/7)
While waiting for climate models to represent ice-sheet dynamics, here are some datasets and methods that can be used to prescribe the evolution of iceberg and ice-shelf meltwater in CMIP-type simulations with no interactive ice sheet. This includes recent data from @oceaniceeu.bsky.social
Finally out! The outcome of a virtual workshop in Feb 2024 with modelers and observationalists to put together data and protocols to include historical changes in ice sheet/ice shelf discharge in CMIP models. Hopefully not too late for some CMIP7 runs!
gmd.copernicus.org/articles/18/...
gmd.copernicus.org/articles/18/...
Datasets and protocols for including anomalous freshwater from melting ice sheets in climate simulations
Abstract. Anomalous freshwater fluxes from the Greenland and Antarctic ice sheets and ice shelves are impacting the surrounding oceans, and we need to be able to account for these effects in climate m...
gmd.copernicus.org
November 7, 2025 at 10:55 PM
While waiting for climate models to represent ice-sheet dynamics, here are some datasets and methods that can be used to prescribe the evolution of iceberg and ice-shelf meltwater in CMIP-type simulations with no interactive ice sheet. This includes recent data from @oceaniceeu.bsky.social
Reposted by Nico Jourdain
On a related topic, we have recently published a preprint of our own work on the bistability of ocean circulation in a box model of ice-shelf cavities: doi.org/10.22541/ess...
PhD work of Louis Saddier, with Chris Bull and Louis Couston.
PhD work of Louis Saddier, with Chris Bull and Louis Couston.
Irreversible Transitions of the Ocean Circulation in Antarctic Ice-Shelf Cavities
Ice shelves fringing the Antarctic continent experience low or high basal melt rates depending on local shelf conditions, ocean circulation and intensity of ice-sea-air exchanges. Recent studies have ...
doi.org
November 6, 2025 at 8:59 AM
On a related topic, we have recently published a preprint of our own work on the bistability of ocean circulation in a box model of ice-shelf cavities: doi.org/10.22541/ess...
PhD work of Louis Saddier, with Chris Bull and Louis Couston.
PhD work of Louis Saddier, with Chris Bull and Louis Couston.
Reposted by Nico Jourdain
The new UNEP report is out with the latest estimates of 2100 warming outcomes under current policies, NDCs, and net-zero targets. Here is how it compares to both the IPCC scenarios and other estimates (CAT and IEA, who will release their own updates soon!).
November 4, 2025 at 6:05 PM
The new UNEP report is out with the latest estimates of 2100 warming outcomes under current policies, NDCs, and net-zero targets. Here is how it compares to both the IPCC scenarios and other estimates (CAT and IEA, who will release their own updates soon!).
A few comments on our recent paper:
1- The high end is based on the SSP585 scenario which was the only one available until 2300 in CMIP6, but according to the reduced-complexity models used in IPCC-AR6, the SSP370 scenario should also cross the limit beyond which most ice shelves become non-viable.
1- The high end is based on the SSP585 scenario which was the only one available until 2300 in CMIP6, but according to the reduced-complexity models used in IPCC-AR6, the SSP370 scenario should also cross the limit beyond which most ice shelves become non-viable.
A link to access the full paper: rdcu.be/eNkZa
Ocean warming threatens the viability of 60% of Antarctic ice shelves
Nature - The viability of Antarctic ice shelves under low rates and high rates of global warming is modelled to estimate when it will become unfeasible for the ice shelves to maintain their...
rdcu.be
November 4, 2025 at 6:38 AM
A few comments on our recent paper:
1- The high end is based on the SSP585 scenario which was the only one available until 2300 in CMIP6, but according to the reduced-complexity models used in IPCC-AR6, the SSP370 scenario should also cross the limit beyond which most ice shelves become non-viable.
1- The high end is based on the SSP585 scenario which was the only one available until 2300 in CMIP6, but according to the reduced-complexity models used in IPCC-AR6, the SSP370 scenario should also cross the limit beyond which most ice shelves become non-viable.
Reposted by Nico Jourdain
If you use Wikipedia, you might have noticed that it isn't cluttered with annoying ads. They depend entirely on donations to remain free & independent.
Why not toss them a few bucks?
donate.wikimedia.org/w/index.php
Why not toss them a few bucks?
donate.wikimedia.org/w/index.php
Make your donation now - Wikimedia Foundation
Donate to the Wikimedia Foundation, the nonprofit that hosts Wikipedia and other crucial free knowledge projects. Each year, the generosity of the 2% of readers who donate allows us to expand the reac...
donate.wikimedia.org
November 1, 2025 at 10:20 PM
If you use Wikipedia, you might have noticed that it isn't cluttered with annoying ads. They depend entirely on donations to remain free & independent.
Why not toss them a few bucks?
donate.wikimedia.org/w/index.php
Why not toss them a few bucks?
donate.wikimedia.org/w/index.php
Reposted by Nico Jourdain
A link to access the full paper: rdcu.be/eNkZa
Ocean warming threatens the viability of 60% of Antarctic ice shelves
Nature - The viability of Antarctic ice shelves under low rates and high rates of global warming is modelled to estimate when it will become unfeasible for the ice shelves to maintain their...
rdcu.be
October 29, 2025 at 5:22 PM
A link to access the full paper: rdcu.be/eNkZa
Reposted by Nico Jourdain
Une majorité de plateformes glaciaires de l’Antarctique menacées à long terme, dans un scénario pessimiste de poursuite du réchauffement climatique
Une majorité de plateformes glaciaires de l’Antarctique menacées à long terme, dans un scénario pessimiste de poursuite du réchauffement climatique
La survie de ces langues de glace, déterminantes pour l’élévation du niveau marin, dépendra du niveau des émissions de gaz à effet de serre, selon des modélisations publiées par la revue « Nature ».
www.lemonde.fr
October 29, 2025 at 4:34 PM
Une majorité de plateformes glaciaires de l’Antarctique menacées à long terme, dans un scénario pessimiste de poursuite du réchauffement climatique
Reposted by Nico Jourdain
🌊🧊🇦🇶
I am happy and proud to present our #platformist team effort out in @nature.com!
www.nature.com/articles/s41...
We examine if, when, and why #Antarctic #ice shelves will no longer be viable, at the latest, due to changes in #atmosphere and #ocean conditions.
A little 🧵 for the experts...
1/7
I am happy and proud to present our #platformist team effort out in @nature.com!
www.nature.com/articles/s41...
We examine if, when, and why #Antarctic #ice shelves will no longer be viable, at the latest, due to changes in #atmosphere and #ocean conditions.
A little 🧵 for the experts...
1/7
Ocean warming threatens the viability of 60% of Antarctic ice shelves - Nature
The viability of Antarctic ice shelves under low rates and high rates of global warming is modelled to estimate when it will become unfeasible for the ice shelves to maintain their present-day shape.
www.nature.com
October 29, 2025 at 4:41 PM
🌊🧊🇦🇶
I am happy and proud to present our #platformist team effort out in @nature.com!
www.nature.com/articles/s41...
We examine if, when, and why #Antarctic #ice shelves will no longer be viable, at the latest, due to changes in #atmosphere and #ocean conditions.
A little 🧵 for the experts...
1/7
I am happy and proud to present our #platformist team effort out in @nature.com!
www.nature.com/articles/s41...
We examine if, when, and why #Antarctic #ice shelves will no longer be viable, at the latest, due to changes in #atmosphere and #ocean conditions.
A little 🧵 for the experts...
1/7
Reposted by Nico Jourdain
Reposted by Nico Jourdain
PNAS: Six-million-year-old ice discovered in Antarctica offers unprecedented window into a warmer Earth via our NSF COLDEX & US Antarctic Program. ❄️ www.pnas.org/doi/10.1073/...
October 28, 2025 at 9:44 PM
PNAS: Six-million-year-old ice discovered in Antarctica offers unprecedented window into a warmer Earth via our NSF COLDEX & US Antarctic Program. ❄️ www.pnas.org/doi/10.1073/...
Reposted by Nico Jourdain
UTTERLY SURREAL LOW ANGLE GLACIER SLIDE!! 😮😱
On Saturday at 11:00 am, a 2 km-long, 25 m-high, and 150-200 m in width section detached off the Ismoil Somoni Glacier (Tajikistan) and slid down the gorge! 🧊🌊
asiaplustj.info/en/node/354309
📽️ via @volcaholic1
On Saturday at 11:00 am, a 2 km-long, 25 m-high, and 150-200 m in width section detached off the Ismoil Somoni Glacier (Tajikistan) and slid down the gorge! 🧊🌊
asiaplustj.info/en/node/354309
📽️ via @volcaholic1
October 28, 2025 at 4:10 PM
UTTERLY SURREAL LOW ANGLE GLACIER SLIDE!! 😮😱
On Saturday at 11:00 am, a 2 km-long, 25 m-high, and 150-200 m in width section detached off the Ismoil Somoni Glacier (Tajikistan) and slid down the gorge! 🧊🌊
asiaplustj.info/en/node/354309
📽️ via @volcaholic1
On Saturday at 11:00 am, a 2 km-long, 25 m-high, and 150-200 m in width section detached off the Ismoil Somoni Glacier (Tajikistan) and slid down the gorge! 🧊🌊
asiaplustj.info/en/node/354309
📽️ via @volcaholic1
Reposted by Nico Jourdain
New research shows that near-term mitigation could spare future generations around 0.6 meters of sea-level rise caused by emissions between 2020 and 2090, making today’s decisions critical not only for limiting warming but also for coastal impacts.
🔗 iiasa.ac.at/news/oct-202...
🔗 iiasa.ac.at/news/oct-202...
October 24, 2025 at 10:14 AM
New research shows that near-term mitigation could spare future generations around 0.6 meters of sea-level rise caused by emissions between 2020 and 2090, making today’s decisions critical not only for limiting warming but also for coastal impacts.
🔗 iiasa.ac.at/news/oct-202...
🔗 iiasa.ac.at/news/oct-202...