Judith Hauck

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!

🌊 oceanjobs

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...

Published today in Earth System Science Data: The Global Carbon Budget 2025
essd.copernicus.org/preprints/es...

🚨 The Global Carbon Budget 2025 has just been released and I actively contributed for the first time 😍

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...

Graph showing: Global Fossil CO2 Emissions

Get your fill of Global Carbon Budget 2025 figures and associated data here, released today:
robbieandrew.github.io/GCB2025/

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/

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

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/

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/

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/

The Global Carbon Budget is out and Glen covers it all in this thread:

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)

10 Years After a Breakthrough Climate Pact, Here’s Where We Are

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 🧵

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!

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...

🌊

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

--> This is also the first publication using the emission-driven AWI-ESM building on a few years of development in the @helmholtz.de Young Investigator Group #MarESys @awi.de

Shout out to @miriamseif.bsky.social and Christopher Danek for the heavy lifting in this work.

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

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...

🌊 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/...

Figure 3: (a) The mean air-sea CO₂ flux density and (b) trend in the CO₂ flux density 1958–2019 in the historical simulation (simulation A) (c–f) The effects of the rising atmospheric CO₂ concentration and climate change on the trend in the CO₂ flux density obtained as the difference between two simulations with and without interannual variability and trends in the respective variable(s): (c) Atmospheric CO₂ concentration, (d) full climate variability and trends, (e) winds and (f) global warming. Positive values denote a trend toward more oceanic outgassing or less oceanic uptake, respectively. Hatched areas in (b–f) indicate a low significance of the trend (p-value > 0.05 applying a two-sided Wald Test with t-distribution).

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

🌟 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!

⬇️

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/...

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...

🌊 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...

NSF plans abrupt end to lone U.S. Antarctic research icebreaker Imminent termination of the RV Nathaniel B. Palmer shocks polar scientists

My latest: Polar scientists warn that the White House and NSF are planning to terminate the Nathaniel Palmer, the only US research icebreaker capable of handling Antarctic extremes, this October.

So far the plan has seen minimal pushback from Congress.

🌊❄️🧪 🇦🇶 Please share:

We have learned that the National Science Foundation is moving ahead with plans to decommission the U.S. Research Vessel/Ice Breaker Nathaniel B. Palmer this October.

If you care about Antarctic research, please read on (1/n)

They want to close the NOAA lab (GML) that brings you this, the most iconic time series in the environmental sciences.

gml.noaa.gov/ccgg/trends/

🌊 Still not familiar with #SOCOM2? 5 key experiments tackling biases in ocean CO₂ reconstructions by addressing data gaps, changing networks & mapping methods. Possible session at #OSM2026!

climate.esa.int/en/supportin...

@oc4c.bsky.social @vliz.be @jhauck.bsky.social @oceancarbon.bsky.social