Jens Daniel Müller
@jens-d-mueller.bsky.social
Ocean Carbon Cycle and Climate Solutions // Research Fellow at Carbon to Sea
https://jens-daniel-mueller.github.io
https://jens-daniel-mueller.github.io
Pinned
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
🌊 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...
🌊
Want to understand how the world’s first carbon credits for ocean alkalinity enhancement were issued? Anna Madlener — one of the new colleagues I’m extremely excited to work with at the Carbon to Sea Initiative — has you covered:
www.carbontosea.org/2025/11/25/a...
www.carbontosea.org/2025/11/25/a...
The First OAE Credits: An Independent MRV Review - Carbon to Sea Initiative
Carbon to Sea’s MRV Blog Series: This is the second installment in Carbon to Sea’s monitoring, reporting, and verification (MRV) blog series. I’m Anna Madlener, Senior Manager for MRV at Carbon to Sea...
www.carbontosea.org
November 26, 2025 at 4:06 PM
🌊
Want to understand how the world’s first carbon credits for ocean alkalinity enhancement were issued? Anna Madlener — one of the new colleagues I’m extremely excited to work with at the Carbon to Sea Initiative — has you covered:
www.carbontosea.org/2025/11/25/a...
www.carbontosea.org/2025/11/25/a...
The First OAE Credits: An Independent MRV Review - Carbon to Sea Initiative
Carbon to Sea’s MRV Blog Series: This is the second installment in Carbon to Sea’s monitoring, reporting, and verification (MRV) blog series. I’m Anna Madlener, Senior Manager for MRV at Carbon to Sea...
www.carbontosea.org
November 26, 2025 at 3:37 PM
Want to understand how the world’s first carbon credits for ocean alkalinity enhancement were issued? Anna Madlener — one of the new colleagues I’m extremely excited to work with at the Carbon to Sea Initiative — has you covered:
www.carbontosea.org/2025/11/25/a...
www.carbontosea.org/2025/11/25/a...
🚨 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 Jens Daniel Müller
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/...
Reposted by Jens Daniel Müller
Call for #abstracts – Ocean Sciences Meeting 2026 🌊
📅 February 22–27, 2026
📍 Glasgow, Scotland
We are excited to announce our #OSM26 session: CC019 – Ocean uptake, transport, and storage of heat and carbon
Details and submission: agu.confex.com/agu/osm26/pr...
See you in Glasgow! ✨️
📅 February 22–27, 2026
📍 Glasgow, Scotland
We are excited to announce our #OSM26 session: CC019 – Ocean uptake, transport, and storage of heat and carbon
Details and submission: agu.confex.com/agu/osm26/pr...
See you in Glasgow! ✨️
July 24, 2025 at 1:07 PM
Call for #abstracts – Ocean Sciences Meeting 2026 🌊
📅 February 22–27, 2026
📍 Glasgow, Scotland
We are excited to announce our #OSM26 session: CC019 – Ocean uptake, transport, and storage of heat and carbon
Details and submission: agu.confex.com/agu/osm26/pr...
See you in Glasgow! ✨️
📅 February 22–27, 2026
📍 Glasgow, Scotland
We are excited to announce our #OSM26 session: CC019 – Ocean uptake, transport, and storage of heat and carbon
Details and submission: agu.confex.com/agu/osm26/pr...
See you in Glasgow! ✨️
Reposted by Jens Daniel Müller
A study in Nature Climate Change shows that the ocean carbon sink unexpectedly declined in 2023 despite record-high sea surface temperatures (SSTs), primarily due to SST-driven outgassing of CO2 in the subtropics. 🌊 🧪
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 sea surface temperatures (SSTs), primarily due to SST-driven outgassing of CO2 in the subtropics.
go.nature.com
September 20, 2025 at 10:49 PM
A study in Nature Climate Change shows that the ocean carbon sink unexpectedly declined in 2023 despite record-high sea surface temperatures (SSTs), primarily due to SST-driven outgassing of CO2 in the subtropics. 🌊 🧪
Reposted by Jens Daniel Müller
History made for the ocean: #BBNJ Agreement enters into force, protecting high seas & deep seabed, safeguarding life under water.
“Our ocean is the foundation of our very existence. Today we took an important step forward to save our ocean, & to save our future” - ED @ingerandersen.bsky.social
“Our ocean is the foundation of our very existence. Today we took an important step forward to save our ocean, & to save our future” - ED @ingerandersen.bsky.social
September 20, 2025 at 6:01 AM
History made for the ocean: #BBNJ Agreement enters into force, protecting high seas & deep seabed, safeguarding life under water.
“Our ocean is the foundation of our very existence. Today we took an important step forward to save our ocean, & to save our future” - ED @ingerandersen.bsky.social
“Our ocean is the foundation of our very existence. Today we took an important step forward to save our ocean, & to save our future” - ED @ingerandersen.bsky.social
Reposted by Jens Daniel Müller
1/n
This study led by @aaronferderer.bsky.social tested how 5 diatom species respond to broad ranges of seawater carbonate conditions. Goal was to determine carbonate chemistry niches and to inform Ocean Alkalinity Enhancement (OAE) and Ocean Acidification (OA)
🌊
www.science.org/doi/10.1126/...
This study led by @aaronferderer.bsky.social tested how 5 diatom species respond to broad ranges of seawater carbonate conditions. Goal was to determine carbonate chemistry niches and to inform Ocean Alkalinity Enhancement (OAE) and Ocean Acidification (OA)
🌊
www.science.org/doi/10.1126/...
Carbonate chemistry fitness landscapes inform diatom resilience to future perturbations
Diatom growth rates are determined by concentrations of CO2 and H+ across broad carbonate chemistry landscapes.
www.science.org
September 19, 2025 at 1:10 AM
1/n
This study led by @aaronferderer.bsky.social tested how 5 diatom species respond to broad ranges of seawater carbonate conditions. Goal was to determine carbonate chemistry niches and to inform Ocean Alkalinity Enhancement (OAE) and Ocean Acidification (OA)
🌊
www.science.org/doi/10.1126/...
This study led by @aaronferderer.bsky.social tested how 5 diatom species respond to broad ranges of seawater carbonate conditions. Goal was to determine carbonate chemistry niches and to inform Ocean Alkalinity Enhancement (OAE) and Ocean Acidification (OA)
🌊
www.science.org/doi/10.1126/...
🌊 Very exciting opportunity in ocean physics!
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 6:53 PM
🌊 Very exciting opportunity in ocean physics!
🚀 Exciting next step: I’ll soon start as a Research Fellow at Carbon to Sea! 🌊
September 15, 2025 at 1:50 PM
🚀 Exciting next step: I’ll soon start as a Research Fellow at Carbon to Sea! 🌊
Reposted by Jens Daniel Müller
Round 1 of the second science seminar for #AntarcticaInSync - an international collaboration aiming at advancing research of all kinds in Antarctica + the Southern Ocean. Fear not if you missed it, there is another chance Wednesday at 15:00 UTC
www.antarctica-insync.org/2nd-antarcti...
www.antarctica-insync.org/2nd-antarcti...
2nd Antarctica InSync International Science Webinar - event - Antarctica Insync
Join us for a dynamic online workshop to advance the scientific planning of Antarctica InSync, an international initiative endorsed by the UN Ocean Decade. Aiming for a circumpolar assessment of Antarctica and the Southern Ocean, the initiative explores the links ... Read more
www.antarctica-insync.org
September 9, 2025 at 8:25 PM
Round 1 of the second science seminar for #AntarcticaInSync - an international collaboration aiming at advancing research of all kinds in Antarctica + the Southern Ocean. Fear not if you missed it, there is another chance Wednesday at 15:00 UTC
www.antarctica-insync.org/2nd-antarcti...
www.antarctica-insync.org/2nd-antarcti...
Every measurement matters 👏👇
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 3:46 PM
Every measurement matters 👏👇
Reposted by Jens Daniel Müller
news.climate.columbia.edu/2025/09/04/t... We've had a new analysis published on the impact on the ocean carbon sink from the unprecedented ocean warming of 2023.
The Ocean Carbon Sink Is Ailing
Measurements analyzed by an international research team indicate the global ocean absorbed significantly less CO₂ than anticipated during the unprecedented marine heatwave in 2023.
news.climate.columbia.edu
September 4, 2025 at 2:11 PM
news.climate.columbia.edu/2025/09/04/t... We've had a new analysis published on the impact on the ocean carbon sink from the unprecedented ocean warming of 2023.
Reposted by Jens Daniel Müller
Great news study of the global ocean carbon sink response to the 2023 warming conditions
🌊 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 6:45 PM
Great news study of the global ocean carbon sink response to the 2023 warming conditions
🌊 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...
Reposted by Jens Daniel Müller
🌊With the Fall semester upon us, it's time to start thinking about recruiting/applying to grad school for 2026.
If you are a marine scientist looking for a graduate student, I've created a form where you can add your name and other info:
docs.google.com/forms/d/e/1F...
Please share widely! (1/2)
If you are a marine scientist looking for a graduate student, I've created a form where you can add your name and other info:
docs.google.com/forms/d/e/1F...
Please share widely! (1/2)
Oceanography MS/PhD Positions for Fall 2026
This is an effort to collect the **contact information of potential advisors** for MS/PhD students in Oceanography.
Please note that if you answer **you are agreeing to have your contact information...
docs.google.com
August 29, 2025 at 5:15 PM
🌊With the Fall semester upon us, it's time to start thinking about recruiting/applying to grad school for 2026.
If you are a marine scientist looking for a graduate student, I've created a form where you can add your name and other info:
docs.google.com/forms/d/e/1F...
Please share widely! (1/2)
If you are a marine scientist looking for a graduate student, I've created a form where you can add your name and other info:
docs.google.com/forms/d/e/1F...
Please share widely! (1/2)
Crazy how time flies: Five years of being a Postdoc, and now already five months since not being a Postdoc anymore in the fabulous @upgroup.bsky.social at @usyseth.bsky.social.
Big smiles, high ropes, and a great send-off! We celebrated @jens-d-mueller.bsky.social's time in our group with a day in the treetops at Seilpark. 🌲💪
#MarineScientistsGoHigh #Farewell #TeamOuting
#MarineScientistsGoHigh #Farewell #TeamOuting
September 1, 2025 at 1:34 PM
Crazy how time flies: Five years of being a Postdoc, and now already five months since not being a Postdoc anymore in the fabulous @upgroup.bsky.social at @usyseth.bsky.social.
Reposted by Jens Daniel Müller
… a few more days to submit your abstract to this wonderful session 🙃 on mCDR 😉 at OSM26
🌊
Biogeochemical and Ecological Insights for Evaluation of Marine Carbon Dioxide Removal (mCDR)
agu.confex.com/agu/osm26/pr...
🌊
Biogeochemical and Ecological Insights for Evaluation of Marine Carbon Dioxide Removal (mCDR)
agu.confex.com/agu/osm26/pr...
August 17, 2025 at 2:15 PM
… a few more days to submit your abstract to this wonderful session 🙃 on mCDR 😉 at OSM26
🌊
Biogeochemical and Ecological Insights for Evaluation of Marine Carbon Dioxide Removal (mCDR)
agu.confex.com/agu/osm26/pr...
🌊
Biogeochemical and Ecological Insights for Evaluation of Marine Carbon Dioxide Removal (mCDR)
agu.confex.com/agu/osm26/pr...
Reposted by Jens Daniel Müller
🌊 Journalists: the ocean needs your voice.
Apply now to the @pulitzercenter Ocean Reporting Network & spend a year investigating the ocean stories that can change our planet’s future.
e.g. deep-sea mining, marine energy, CO2 removal or polar issues
pulitzercenter.org/blog/journal...
Apply now to the @pulitzercenter Ocean Reporting Network & spend a year investigating the ocean stories that can change our planet’s future.
e.g. deep-sea mining, marine energy, CO2 removal or polar issues
pulitzercenter.org/blog/journal...
Journalism That Goes Deep: Applications Open for Ocean Reporting Fellowships
Image Applications are now open to join the third cohort of the Ocean Reporting Network (ORN), a fellowship program that gives professional journalists the opportunity to spend up to a year working on...
pulitzercenter.org
August 13, 2025 at 10:18 AM
🌊 Journalists: the ocean needs your voice.
Apply now to the @pulitzercenter Ocean Reporting Network & spend a year investigating the ocean stories that can change our planet’s future.
e.g. deep-sea mining, marine energy, CO2 removal or polar issues
pulitzercenter.org/blog/journal...
Apply now to the @pulitzercenter Ocean Reporting Network & spend a year investigating the ocean stories that can change our planet’s future.
e.g. deep-sea mining, marine energy, CO2 removal or polar issues
pulitzercenter.org/blog/journal...
Reposted by Jens Daniel Müller
🌊 I’m hiring! Research Scientist in Marine Ecology & Machine Learning at the National Oceanography Centre, Southampton (UK). Got experience with machine learning techniques applied to marine ecology, biogeochemistry or climate change? Apply by 5 September! careers.noc.ac.uk/vacancy/rese...
Careers | National Oceanography Centre
careers.noc.ac.uk
August 8, 2025 at 3:38 PM
🌊 I’m hiring! Research Scientist in Marine Ecology & Machine Learning at the National Oceanography Centre, Southampton (UK). Got experience with machine learning techniques applied to marine ecology, biogeochemistry or climate change? Apply by 5 September! careers.noc.ac.uk/vacancy/rese...
Reposted by Jens Daniel Müller
🌊 Surprisingly stable: nitrous oxide emissions only vary by 17% during ENSO events in the Eastern Tropical Pacific.
In our new preprint, we identify the mechanism behind the limited variability — and discuss the importance of this mechanism in the future. 🌎
🔗 Read more: doi.org/10.22541/ess...
In our new preprint, we identify the mechanism behind the limited variability — and discuss the importance of this mechanism in the future. 🌎
🔗 Read more: doi.org/10.22541/ess...
Impact of ENSO on Nitrous Oxide Emission in the Eastern Tropical Pacific
Nitrous oxide (N2O) is a powerful greenhouse gas, with the ocean contributing ~4.2 Tg N y-1 to global N2O emissions. The Eastern Tropical Pacific (ETP) is a hotspot of N2O emissions due to high N2O pr...
doi.org
June 29, 2025 at 6:24 AM
🌊 Surprisingly stable: nitrous oxide emissions only vary by 17% during ENSO events in the Eastern Tropical Pacific.
In our new preprint, we identify the mechanism behind the limited variability — and discuss the importance of this mechanism in the future. 🌎
🔗 Read more: doi.org/10.22541/ess...
In our new preprint, we identify the mechanism behind the limited variability — and discuss the importance of this mechanism in the future. 🌎
🔗 Read more: doi.org/10.22541/ess...
Reposted by Jens Daniel Müller
New report released today on marine carbon dioxide removal #OOSC
covering scientific, MRV, environmental, social & governance issues and role of governments in responsible #mCDR R&D 🌊
High Level Panel for a Sustainable Ocean Economy & WRI
oceanpanel.org/publication/...
covering scientific, MRV, environmental, social & governance issues and role of governments in responsible #mCDR R&D 🌊
High Level Panel for a Sustainable Ocean Economy & WRI
oceanpanel.org/publication/...
Principles for responsible and effective marine carbon dioxide removal development and governance - Ocean Panel
Launched on June 4, 2025, at the One Ocean Science Congress in Nice, France, ahead of the United Nations Ocean Conference, this Blue Paper was
oceanpanel.org
June 4, 2025 at 10:27 AM
New report released today on marine carbon dioxide removal #OOSC
covering scientific, MRV, environmental, social & governance issues and role of governments in responsible #mCDR R&D 🌊
High Level Panel for a Sustainable Ocean Economy & WRI
oceanpanel.org/publication/...
covering scientific, MRV, environmental, social & governance issues and role of governments in responsible #mCDR R&D 🌊
High Level Panel for a Sustainable Ocean Economy & WRI
oceanpanel.org/publication/...
🌊 New preprint online establishing a catalog of ocean carbon data products.
🎯 Our hope is to ease user access to the highly diverse compilation of available datasets.
❓️If you have ideas on how we can further improve toward this goal, or if you spot any missing data products, please reach out.
🎯 Our hope is to ease user access to the highly diverse compilation of available datasets.
❓️If you have ideas on how we can further improve toward this goal, or if you spot any missing data products, please reach out.
‼️ Check out our new discussion paper "Synthesis of data products for ocean carbonate chemistry" led by Liqing Jiang.
🌊
essd.copernicus.org/preprints/es...
🌊
essd.copernicus.org/preprints/es...
Synthesis of data products for ocean carbonate chemistry
Abstract. As the largest active carbon reservoir on Earth, the ocean is a cornerstone of the global carbon cycle, playing a pivotal role in modulating ocean health and regulating climate. Understandin...
essd.copernicus.org
May 15, 2025 at 4:40 PM
🌊 New preprint online establishing a catalog of ocean carbon data products.
🎯 Our hope is to ease user access to the highly diverse compilation of available datasets.
❓️If you have ideas on how we can further improve toward this goal, or if you spot any missing data products, please reach out.
🎯 Our hope is to ease user access to the highly diverse compilation of available datasets.
❓️If you have ideas on how we can further improve toward this goal, or if you spot any missing data products, please reach out.
Reposted by Jens Daniel Müller
CORAL PHD OPPORTUNITY: Dissolution of cold-water corals in a changing ocean (Heriot-Watt University, UK)
www.findaphd.com/phds/project...
#coralreefs #coldwatercorals #phd #phdopportunity #coralphd #coral #careers #careerdevelopment #oceanacidification #marinebiology
www.findaphd.com/phds/project...
#coralreefs #coldwatercorals #phd #phdopportunity #coralphd #coral #careers #careerdevelopment #oceanacidification #marinebiology
May 13, 2025 at 8:27 AM
CORAL PHD OPPORTUNITY: Dissolution of cold-water corals in a changing ocean (Heriot-Watt University, UK)
www.findaphd.com/phds/project...
#coralreefs #coldwatercorals #phd #phdopportunity #coralphd #coral #careers #careerdevelopment #oceanacidification #marinebiology
www.findaphd.com/phds/project...
#coralreefs #coldwatercorals #phd #phdopportunity #coralphd #coral #careers #careerdevelopment #oceanacidification #marinebiology
Reposted by Jens Daniel Müller
🚨 PNNL is Hiring 🚨
Join us in Sequim, WA as our PNNL Marine Ops Manager:
careers.pnnl.gov/jobs/10671?l...
a 2nd position in a lab ops setting is here:
careers.pnnl.gov/jobs/10661?l...
Join us in Sequim, WA as our PNNL Marine Ops Manager:
careers.pnnl.gov/jobs/10671?l...
a 2nd position in a lab ops setting is here:
careers.pnnl.gov/jobs/10661?l...
Marine Operations Program Manager in Sequim, Washington | Pacific Northwest National Laboratory
PNNL is hiring a Marine Operations Program Manager in Sequim, Washington. Review all of the job details and apply today!
careers.pnnl.gov
May 12, 2025 at 3:57 PM
🚨 PNNL is Hiring 🚨
Join us in Sequim, WA as our PNNL Marine Ops Manager:
careers.pnnl.gov/jobs/10671?l...
a 2nd position in a lab ops setting is here:
careers.pnnl.gov/jobs/10661?l...
Join us in Sequim, WA as our PNNL Marine Ops Manager:
careers.pnnl.gov/jobs/10671?l...
a 2nd position in a lab ops setting is here:
careers.pnnl.gov/jobs/10661?l...