Judith Hauck
@jhauck.bsky.social
Professor of polar biogeochemical modelling at University of Bremen and ocean carbon cycle scientist / marine biogeochemical modeller at the Alfred Wegener Institute for Polar and Marine Research, Germany. Views are my own.
Zur Veröffentlichung des Global Carbon Budget 2025 haben Julia Pongratz @lmumuenchen.bsky.social und ich die Ergebnisse in einem Pressebriefing des SMC vorgestellt und mit Jan Minx @pik-potsdam.bsky.social, Silvio Wenzel und den Journalisten diskutiert.
Danke für das Interesse und die Fragen!
Danke für das Interesse und die Fragen!
Weiter, immer weiter: Die globalen CO2-Emissionen steigen auch 2025 auf ein neues Rekordniveau. 1,1 % mehr als im Vorjahr prognostiziert das Global Carbon Budget. In Press Briefing ordneten Expert:innen die Bilanz, Trends und Konsequenzen ein: www.sciencemediacenter.de/angebote/glo...
November 15, 2025 at 2:30 PM
Zur Veröffentlichung des Global Carbon Budget 2025 haben Julia Pongratz @lmumuenchen.bsky.social und ich die Ergebnisse in einem Pressebriefing des SMC vorgestellt und mit Jan Minx @pik-potsdam.bsky.social, Silvio Wenzel und den Journalisten diskutiert.
Danke für das Interesse und die Fragen!
Danke für das Interesse und die Fragen!
Reposted by Judith Hauck
🌊 oceanjobs
On behalf of the Department of Oceanography at the University of Hawaiʻi at Mānoa, we are excited to invite applications for a full-time, tenure-track faculty position in Ocean Biogeochemical Modeling at the rank of assistant professor. www.schooljobs.com/careers/hawa... position number 0082726
November 15, 2025 at 7:01 AM
🌊 oceanjobs
Reposted by Judith Hauck
Published today in Earth System Science Data: The Global Carbon Budget 2025
essd.copernicus.org/preprints/es...
essd.copernicus.org/preprints/es...
Global Carbon Budget 2025
Abstract. Accurate assessment of anthropogenic carbon dioxide (CO2) emissions and their redistribution among the atmosphere, ocean, and terrestrial biosphere in a changing climate is critical to bette...
essd.copernicus.org
November 13, 2025 at 3:07 PM
Published today in Earth System Science Data: The Global Carbon Budget 2025
essd.copernicus.org/preprints/es...
essd.copernicus.org/preprints/es...
Reposted by Judith Hauck
🚨 The Global Carbon Budget 2025 has just been released and I actively contributed for the first time 😍
📢Global Carbon Budget 2025📢
Fossil CO2 emissions continue to rise in 2025 while the terrestrial carbon sink recovers to pre-El Niño strength.
The key findings are covered in two reports this year:
* ESSDD (preprint): essd.copernicus.org/preprints/es...
* Nature: www.nature.com/articles/s41...
1/
Fossil CO2 emissions continue to rise in 2025 while the terrestrial carbon sink recovers to pre-El Niño strength.
The key findings are covered in two reports this year:
* ESSDD (preprint): essd.copernicus.org/preprints/es...
* Nature: www.nature.com/articles/s41...
1/
November 13, 2025 at 1:14 PM
🚨 The Global Carbon Budget 2025 has just been released and I actively contributed for the first time 😍
Reposted by Judith Hauck
1/2
We just published the Global Carbon Budget 2025, with a mix of bad news (CO2 emissions continue to grow) and encouraging news (35 countries saw emissions decline over the past decade while growing their economies).
Read the highlights in a short article:
theconversation.com/the-worlds-c...
We just published the Global Carbon Budget 2025, with a mix of bad news (CO2 emissions continue to grow) and encouraging news (35 countries saw emissions decline over the past decade while growing their economies).
Read the highlights in a short article:
theconversation.com/the-worlds-c...
November 13, 2025 at 12:16 AM
1/2
We just published the Global Carbon Budget 2025, with a mix of bad news (CO2 emissions continue to grow) and encouraging news (35 countries saw emissions decline over the past decade while growing their economies).
Read the highlights in a short article:
theconversation.com/the-worlds-c...
We just published the Global Carbon Budget 2025, with a mix of bad news (CO2 emissions continue to grow) and encouraging news (35 countries saw emissions decline over the past decade while growing their economies).
Read the highlights in a short article:
theconversation.com/the-worlds-c...
Reposted by Judith Hauck
Get your fill of Global Carbon Budget 2025 figures and associated data here, released today:
robbieandrew.github.io/GCB2025/
robbieandrew.github.io/GCB2025/
November 13, 2025 at 6:45 AM
Get your fill of Global Carbon Budget 2025 figures and associated data here, released today:
robbieandrew.github.io/GCB2025/
robbieandrew.github.io/GCB2025/
Reposted by Judith Hauck
The concentration of CO2 in the atmosphere is set to reach 425.7 parts per million in 2025.
Emerging climate impacts on the land and ocean carbon sinks contributed 8% to the rise in atmospheric CO2 concentration since 1960.
11/
Emerging climate impacts on the land and ocean carbon sinks contributed 8% to the rise in atmospheric CO2 concentration since 1960.
11/
November 13, 2025 at 7:07 AM
The concentration of CO2 in the atmosphere is set to reach 425.7 parts per million in 2025.
Emerging climate impacts on the land and ocean carbon sinks contributed 8% to the rise in atmospheric CO2 concentration since 1960.
11/
Emerging climate impacts on the land and ocean carbon sinks contributed 8% to the rise in atmospheric CO2 concentration since 1960.
11/
Reposted by Judith Hauck
The land and ocean CO₂ sink are 25% and 7% smaller, respectively, than they would have been without the effects of climate change and variability, on average for the 2015-2024 period.
Combined, this is equivalent to the total sink (land and ocean) being nearly 20% smaller than otherwise.
/10
Combined, this is equivalent to the total sink (land and ocean) being nearly 20% smaller than otherwise.
/10
November 13, 2025 at 7:07 AM
The land and ocean CO₂ sink are 25% and 7% smaller, respectively, than they would have been without the effects of climate change and variability, on average for the 2015-2024 period.
Combined, this is equivalent to the total sink (land and ocean) being nearly 20% smaller than otherwise.
/10
Combined, this is equivalent to the total sink (land and ocean) being nearly 20% smaller than otherwise.
/10
Reposted by Judith Hauck
The land & ocean CO2 sinks were re-evaluated based on stronger evidence & new understanding
• The ocean CO2 sink was re-evaluated upwards, taking up 29% of the total emissions.
• The land CO2 sink was re-evaluated downwards, taking up 21% of the total emissions.
www.nature.com/articles/s41...
9/
• The ocean CO2 sink was re-evaluated upwards, taking up 29% of the total emissions.
• The land CO2 sink was re-evaluated downwards, taking up 21% of the total emissions.
www.nature.com/articles/s41...
9/
November 13, 2025 at 7:07 AM
The land & ocean CO2 sinks were re-evaluated based on stronger evidence & new understanding
• The ocean CO2 sink was re-evaluated upwards, taking up 29% of the total emissions.
• The land CO2 sink was re-evaluated downwards, taking up 21% of the total emissions.
www.nature.com/articles/s41...
9/
• The ocean CO2 sink was re-evaluated upwards, taking up 29% of the total emissions.
• The land CO2 sink was re-evaluated downwards, taking up 21% of the total emissions.
www.nature.com/articles/s41...
9/
Reposted by Judith Hauck
Total anthropogenic CO2 emissions – the sum of fossil & land-use change emissions – have grown more slowly in the past decade1 (0.3% per year on average), compared to the previous decade (1.9% per year).
The growth in fossil emissions is offset by the decrease in land-use change emissions.
8/
The growth in fossil emissions is offset by the decrease in land-use change emissions.
8/
November 13, 2025 at 7:07 AM
Total anthropogenic CO2 emissions – the sum of fossil & land-use change emissions – have grown more slowly in the past decade1 (0.3% per year on average), compared to the previous decade (1.9% per year).
The growth in fossil emissions is offset by the decrease in land-use change emissions.
8/
The growth in fossil emissions is offset by the decrease in land-use change emissions.
8/
Reposted by Judith Hauck
Good news: 35 countries have decreased their fossil CO2 emissions significantly (p<0.05) while growing their economies in the decade 2015-20244, twice as many as during the previous decade (2005-2014; 18 countries.
These 35 countries account for 27% of global fossil CO2 emissions.
5/
These 35 countries account for 27% of global fossil CO2 emissions.
5/
November 13, 2025 at 7:07 AM
Good news: 35 countries have decreased their fossil CO2 emissions significantly (p<0.05) while growing their economies in the decade 2015-20244, twice as many as during the previous decade (2005-2014; 18 countries.
These 35 countries account for 27% of global fossil CO2 emissions.
5/
These 35 countries account for 27% of global fossil CO2 emissions.
5/
The Global Carbon Budget is out and Glen covers it all in this thread:
📢Global Carbon Budget 2025📢
Fossil CO2 emissions continue to rise in 2025 while the terrestrial carbon sink recovers to pre-El Niño strength.
The key findings are covered in two reports this year:
* ESSDD (preprint): essd.copernicus.org/preprints/es...
* Nature: www.nature.com/articles/s41...
1/
Fossil CO2 emissions continue to rise in 2025 while the terrestrial carbon sink recovers to pre-El Niño strength.
The key findings are covered in two reports this year:
* ESSDD (preprint): essd.copernicus.org/preprints/es...
* Nature: www.nature.com/articles/s41...
1/
November 13, 2025 at 7:18 AM
The Global Carbon Budget is out and Glen covers it all in this thread:
Reposted by Judith Hauck
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)
Reposted by Judith Hauck
Great dissection of where the world stands on climate 10 years after Paris: better than ever; worse than needed.
Start here: www.nytimes.com/interactive/...
But lemme quibble a bit with the CO₂ₑ emissions pathways painted here.
A quick 🧵
Start here: www.nytimes.com/interactive/...
But lemme quibble a bit with the CO₂ₑ emissions pathways painted here.
A quick 🧵
November 7, 2025 at 8:23 PM
Great dissection of where the world stands on climate 10 years after Paris: better than ever; worse than needed.
Start here: www.nytimes.com/interactive/...
But lemme quibble a bit with the CO₂ₑ emissions pathways painted here.
A quick 🧵
Start here: www.nytimes.com/interactive/...
But lemme quibble a bit with the CO₂ₑ emissions pathways painted here.
A quick 🧵
Reposted by Judith Hauck
Seeking a three year postdoc in the field of ocean biogeochemistry and productivity using mechanistic models and synthesis of observations. Note the short fuse for applications. Please help distribute. All nationalities welcome to apply! 🌊
www.jobs.ac.uk/job/DPG117/p...
www.jobs.ac.uk/job/DPG117/p...
Postdoctoral Research Associate at University of Liverpool
Looking for a new job opportunity in academia? Check out this job opening for a Postdoctoral Research Associate on jobs.ac.uk!
www.jobs.ac.uk
October 29, 2025 at 5:38 PM
Seeking a three year postdoc in the field of ocean biogeochemistry and productivity using mechanistic models and synthesis of observations. Note the short fuse for applications. Please help distribute. All nationalities welcome to apply! 🌊
www.jobs.ac.uk/job/DPG117/p...
www.jobs.ac.uk/job/DPG117/p...
🌊
Very happy to see this paper from the #OceanNETs project out:
--> net primary production can locally be reduced by 15% in regions of ocean alkalinity enhancement due to indirect effects.
1/2
--> net primary production can locally be reduced by 15% in regions of ocean alkalinity enhancement due to indirect effects.
1/2
🌊 New paper out today: Assessing the interaction between ocean alkalinity enhancement 🚢 and phytoplankton🦠 in an Earth System Model 🌐
#mCDR #OAE #ESM
bg.copernicus.org/articles/22/...
#mCDR #OAE #ESM
bg.copernicus.org/articles/22/...
October 22, 2025 at 9:23 PM
🌊
Reposted by Judith Hauck
We are - to our knowledge for the first time - not only assessing the potential efficiency of OAE using a global model, but also potential effects on phytoplankton and how phytoplankton can affect OAE efficiency.
Exiting results - enjoy reading 😊
@jhauck.bsky.social
Exiting results - enjoy reading 😊
@jhauck.bsky.social
October 22, 2025 at 3:06 PM
We are - to our knowledge for the first time - not only assessing the potential efficiency of OAE using a global model, but also potential effects on phytoplankton and how phytoplankton can affect OAE efficiency.
Exiting results - enjoy reading 😊
@jhauck.bsky.social
Exiting results - enjoy reading 😊
@jhauck.bsky.social
Very happy to see this paper from the #OceanNETs project out:
--> net primary production can locally be reduced by 15% in regions of ocean alkalinity enhancement due to indirect effects.
1/2
--> net primary production can locally be reduced by 15% in regions of ocean alkalinity enhancement due to indirect effects.
1/2
🌊 New paper out today: Assessing the interaction between ocean alkalinity enhancement 🚢 and phytoplankton🦠 in an Earth System Model 🌐
#mCDR #OAE #ESM
bg.copernicus.org/articles/22/...
#mCDR #OAE #ESM
bg.copernicus.org/articles/22/...
Interactions between ocean alkalinity enhancement and phytoplankton in an Earth system model
Abstract. The functioning and efficiency of ocean alkalinity enhancement (OAE) as a CO2 removal strategy is well investigated in model studies, but risks for the ecosystem are presently not considered...
bg.copernicus.org
October 22, 2025 at 9:22 PM
Very happy to see this paper from the #OceanNETs project out:
--> net primary production can locally be reduced by 15% in regions of ocean alkalinity enhancement due to indirect effects.
1/2
--> net primary production can locally be reduced by 15% in regions of ocean alkalinity enhancement due to indirect effects.
1/2
Reposted by Judith Hauck
Open Letter by scientists to the Council:
"Climate Neutrality Is Europe’s Greatest Economic Opportunity”.
Ahead of the European Council meeting on 23.10.2025,
2,178 scientists urge EU Heads of States & Governments to take ambitious decisions for the 2040 targets.
zenodo.org/records/1739...
"Climate Neutrality Is Europe’s Greatest Economic Opportunity”.
Ahead of the European Council meeting on 23.10.2025,
2,178 scientists urge EU Heads of States & Governments to take ambitious decisions for the 2040 targets.
zenodo.org/records/1739...
October 20, 2025 at 4:23 PM
Open Letter by scientists to the Council:
"Climate Neutrality Is Europe’s Greatest Economic Opportunity”.
Ahead of the European Council meeting on 23.10.2025,
2,178 scientists urge EU Heads of States & Governments to take ambitious decisions for the 2040 targets.
zenodo.org/records/1739...
"Climate Neutrality Is Europe’s Greatest Economic Opportunity”.
Ahead of the European Council meeting on 23.10.2025,
2,178 scientists urge EU Heads of States & Governments to take ambitious decisions for the 2040 targets.
zenodo.org/records/1739...
Reposted by Judith Hauck
🌊 Open position W2-Professorship (with tenure track) in Physical Oceanography @geomarkiel.bsky.social in Kiel, Germany.
Application deadline: 5th of November 2025
Please find more information here:
www.geomar.de/en/karriere/...
Application deadline: 5th of November 2025
Please find more information here:
www.geomar.de/en/karriere/...
W 2-Professorship (with tenure track to W 2) in Physical Oceanography
www.geomar.de
September 29, 2025 at 12:47 PM
🌊 Open position W2-Professorship (with tenure track) in Physical Oceanography @geomarkiel.bsky.social in Kiel, Germany.
Application deadline: 5th of November 2025
Please find more information here:
www.geomar.de/en/karriere/...
Application deadline: 5th of November 2025
Please find more information here:
www.geomar.de/en/karriere/...
Reposted by Judith Hauck
Frauke Bunsen, Cara Nissen and Judith Hauck assess the impacts of climate change on the global ocean carbon sink
doi.org/10.1029/2023...
#ocean #carbon
doi.org/10.1029/2023...
#ocean #carbon
September 18, 2025 at 1:39 PM
Frauke Bunsen, Cara Nissen and Judith Hauck assess the impacts of climate change on the global ocean carbon sink
doi.org/10.1029/2023...
#ocean #carbon
doi.org/10.1029/2023...
#ocean #carbon
Reposted by Judith Hauck
🌟 Postdoc Opportunity in Marine Biogeochemistry at CNRS-CEREGE!
🚢 Are you a passionate researcher ready to tackle climate change? Dive into the ERC-funded Deep-C project in Aix-en-Provence, France!
⬇️
🚢 Are you a passionate researcher ready to tackle climate change? Dive into the ERC-funded Deep-C project in Aix-en-Provence, France!
⬇️
September 29, 2025 at 10:01 AM
🌟 Postdoc Opportunity in Marine Biogeochemistry at CNRS-CEREGE!
🚢 Are you a passionate researcher ready to tackle climate change? Dive into the ERC-funded Deep-C project in Aix-en-Provence, France!
⬇️
🚢 Are you a passionate researcher ready to tackle climate change? Dive into the ERC-funded Deep-C project in Aix-en-Provence, France!
⬇️
Reposted by Judith Hauck
In the Department of Earth and Environmental Sciences @columbiauniversity.bsky.social, we are hiring an Assistant Professor in Atmosphere and/or Ocean Physics. No deadline stated, but review will begin soon, so please do not delay. apply.interfolio.com/173819
September 16, 2025 at 5:46 PM
In the Department of Earth and Environmental Sciences @columbiauniversity.bsky.social, we are hiring an Assistant Professor in Atmosphere and/or Ocean Physics. No deadline stated, but review will begin soon, so please do not delay. apply.interfolio.com/173819
So nice to see #Polarstern pCO₂ data from the @awi.de MOSAiC expedition being used to provide better quantifications of Arctic Ocean CO₂ uptake. 🌊
agupubs.onlinelibrary.wiley.com/doi/10.1029/...
agupubs.onlinelibrary.wiley.com/doi/10.1029/...
September 4, 2025 at 3:00 PM
So nice to see #Polarstern pCO₂ data from the @awi.de MOSAiC expedition being used to provide better quantifications of Arctic Ocean CO₂ uptake. 🌊
agupubs.onlinelibrary.wiley.com/doi/10.1029/...
agupubs.onlinelibrary.wiley.com/doi/10.1029/...
Reposted by Judith Hauck
🌊 In 2023, the ocean carbon sink weakened for the first time in a record-hot year 🌡️🌎
Our new study in Nature Climate Change quantifies this unexpected decline and explains how it came about. 👇
doi.org/10.1038/s415...
Our new study in Nature Climate Change quantifies this unexpected decline and explains how it came about. 👇
doi.org/10.1038/s415...
Unexpected decline in the ocean carbon sink under record-high sea surface temperatures in 2023 - Nature Climate Change
The ocean carbon sink strengthened in previous warm El Niño years due to reduced CO2 outgassing in the tropics. Here the authors show that the ocean carbon sink declined in 2023 despite record-high se...
doi.org
September 2, 2025 at 11:59 AM
🌊 In 2023, the ocean carbon sink weakened for the first time in a record-hot year 🌡️🌎
Our new study in Nature Climate Change quantifies this unexpected decline and explains how it came about. 👇
doi.org/10.1038/s415...
Our new study in Nature Climate Change quantifies this unexpected decline and explains how it came about. 👇
doi.org/10.1038/s415...