Frerk Pöppelmeier

Frerk Pöppelmeier

@fpoeppelmeier.bsky.social

Ocean modeller and marine geochemist at University of Bern. Interested in ocean physics/chemistry and climate change of the past and future.

675 followers174 following24 posts

Frerk Pöppelmeier reposted

St Andrews Earth & Environmental Sciences
@earthscista.bsky.social

📣 We seek to appoint a Chair (with rank of professor) within the School of Earth & Environmental Sciences. The successful candidate will be an outstanding scholar of international standing in the field. 🗓 Closing Date: 23 March 2026 Full details: www.vacancies.st-andrews.ac.uk/Vacancies/I/...

vacancies.st-andrews.ac.ukChair in Earth Sciences - AC2672Chair in Earth Sciences - AC2672, Earth and Environmental Sciences Salary: Grade 9/Negotiable Start Date: September 2026 , <p style="margin-right: 22.7pt; text-align: justify;"><span style="color: bl...

Frerk Pöppelmeier reposted

Ed Hathorne
@edhathorne.bsky.social

Antarctic Intermediate Water Variability in the South Atlantic Over the Last 600,000 years - Soaga - 2025 - Paleoceanography and Paleoclimatology - Wiley Online Library

Frerk Pöppelmeier reposted

Nature Geoscience
@natgeosci.nature.com

⚒️ Article: Antarctic Bottom Water progressively filled more of the deep Southern Ocean through the last deglaciation, potentially contributing to the increase in atmospheric CO2 www.nature.com/articles/s41...

nature.comExpansion of Antarctic Bottom Water driven by Antarctic warming in the last deglaciation - Nature GeoscienceAntarctic Bottom Water progressively filled more of the deep Southern Ocean through the last deglaciation, potentially contributing to the increase in atmospheric CO2, according to neodymium isotope r...

Frerk Pöppelmeier reposted

Andreas Schmittner
@andreasschmittner.bsky.social

New publication: how does a collapse of the Atlantic Meridional Overturning Circulation (AMOC) affect carbon and d13C cycles in the ocean? doi.org/10.1029/2025... doi.org/10.1029/2025...

doi.orgImpact of Atlantic Meridional Overturning Circulation Collapse on Carbon‐13 Components in the OceanSimulated collapse of the Atlantic Meridional Overturning Circulation affects atmospheric CO2 ${\text{CO}}_{2}$ and δ13CCO2 ${C}_{\mathit{CO2}}$ Largest effect on ocean δ13CDIC ${C}_{\mathit{DIC}...

Frerk Pöppelmeier reposted

Zeke Hausfather
@zekehausfather.com

Replying to @zekehausfather.com

A new Nature paper accompanying the Global Carbon Budget finds that the land and ocean sinks are 25% smaller and 7% smaller, respectively, than they would have been without the effects of climate change over 2015-24:

nature.comEmerging climate impact on carbon sinks in a consolidated carbon budget | NatureDespite the adoption of the Paris Agreement ten years ago, fossil CO2 emissions continue to rise, pushing atmospheric CO2 levels to 423 ppm in 2024 and driving human-induced warming to 1.36°C, within years of breaching the 1.5°C limit 1,2. Accurate reporting of anthropogenic and natural CO2 sources and sinks is a prerequisite to tracking the effectiveness of climate policy and detecting carbon sink responses to climate change. Yet notable mismatches between reported emissions and sinks have so far prevented confident interpretation of their trends and drivers 1. Here, we present and integrate recent advances in observations and process understanding to address some long-standing issues in the global carbon budget estimates. We show that the magnitude of the natural land sink is substantially smaller than previously estimated, while net emissions from anthropogenic land-use change are revised upwards 1. The ocean sink is 15% larger than the land sink, consistent with new evidence from oceanic and atmospheric observations 3,4. Climate change reduces the efficiency of the sinks, particularly on land, contributing 8.3 ± 1.4 ppm to the atmospheric CO2 increase since 1960. The combined effects of climate change and deforestation turn Southeast Asian and large parts of South American tropical forests from CO2 sinks to sources. This underscores the need to halt deforestation and limit warming to prevent further loss of carbon stored on land. Improved confidence in assessments of CO2 sources and sinks is fundamental for effective climate policy.

Frerk Pöppelmeier reposted

Prof Ian Hall
@ianhall.bsky.social

Destabilization of Earth system tipping elements (Review) suggesting key Earth system tipping points - like the Greenland Ice Sheet, Amazon rainforest, and AMOC - are losing stability and nearing critical thresholds Interactions may mask warning signs www.nature.com/articles/s41...

nature.comDestabilization of Earth system tipping elements - Nature GeoscienceA review of observation-based evidence suggests that four interconnected Earth system tipping elements have moved towards their critical thresholds, highlighting the need for better monitoring and increased mitigation efforts.

Frerk Pöppelmeier reposted

Yona Silvy
@yonasilvy.bsky.social

Do you think climate science needs to be better communicated? We do too! That's why we are looking for a climate science communication specialist to join the Technical Support Unit of the IPCC Working Group I. All details can be found here: www.ipcc.ch/2025/09/17/c... Please share!

Frerk Pöppelmeier
@fpoeppelmeier.bsky.social

We find robust stabilizing feedbacks between both Earth system components. Greenland meltwater may weaken the AMOC, but the then induced cooling limits further Greenland melting and hence also further weakening of the AMOC, at least in moderate warming scenarios.

Frerk Pöppelmeier reposted

Prof Michael Meredith 🌊🧪🥼❄️
@oceanandice.bsky.social

I am co-convening a meeting at the Royal Society later this year, with @krhendry.bsky.social and other very excellent polar science colleagues. If you have interests relating to Antarctica and the impacts of climate change, please consider participating!

Royal Society Publishing@royalsocietypublishing.org

Are you a scientist with an interest in #ClimateChange and Antarctica? This September, join a team of leading oceanographers & climate scientists from @bas.ac.uk for a scientific meeting at the Royal Society: royalsociety.org/science-even... @oceanandice.bsky.social @krhendry.bsky.social

Frerk Pöppelmeier reposted

Thomas Bauska
@tinyicybubbles.bsky.social

🚨--- New Paper ---🚨 Watch Florian Krauss @iceflow42.bsky.social wield the ¹³C of CO₂ sword across the highest, NATURAL spike in CO₂ and CH₄ of the last 800,000 years. www.pnas.org/doi/10.1073/...

pnas.orgMultiple sources of atmospheric CO2 activated by AMOC recovery at the onset of interglacial MIS 9 | PNASUsing high-precision ice core measurements of CO2, &delta;13C&ndash;CO2, CH4, and N2O, this study provides carbon isotope constraints on a sizeable, centennial...

Frerk Pöppelmeier reposted

CNN
@cnn.com

The Trump administration plans to eliminate the research arm of National Oceanic and Atmospheric Administration, close all weather and climate labs and eviscerate its budget along with several other NOAA offices, according to internal documents obtained by CNN.

cnn.comTrump’s draft budget eviscerates weather and climate tracking and research | CNNThe move would devastate weather and climate research even as weather is becoming more erratic and extreme, and would cripple the US industries — including agriculture — that depend on free, accurate ...

Frerk Pöppelmeier reposted

Thomas Frölicher
@froeltho.bsky.social

📢 Postdoc Opportunity: Ocean Tipping Points & Impacts! We're hiring a postdoc in my group at the University of Bern, Switzerland, to study ocean tipping points and their impacts. The position is part of HEurope project TipESM (@tipesm.bsky.social). Feel free to reach out with any questions. 🌊

Frerk Pöppelmeier reposted

Beni Stocker
@stineb.bsky.social

Together with @fpoeppelmeier.bsky.social, we have an open 2-year postdoc position on Next Generation Bern Earth System Model at University of Bern and the Oeschger Centre. ohws.prospective.ch/public/v1/jo...

ohws.prospective.chUni Bern: Postdoc position: “Next Generation Bern Earth System Model”The University of Bern is seeking a highly motivated postdoctoral researcher for a two-year position in Earth System Modeling with a focus on land vegetation dynamics, jointly hosted by the Climate an...
Frerk Pöppelmeier
@fpoeppelmeier.bsky.social

Are you interested in climate tipping points and considering to go to next year's #PAGES25 #OSM25? Why not submit an abstract to our session 22: Understanding Thresholds, Tipping Points, and Abrupt Climate Change Across Different Spatial-Temporal Scales? www.pages2025.org.cn/Data/List/Se...

pages2025.org.cnSessions - PAGES Shanghai 2025Contact: Dr. Shouting Tuo State Key Laboratory of Marine Geology Tongji University 1239 Siping Road, Shanghai 200092, China Email: pages2025@tongji.edu.cn, Tel.: +86-21-6598 2198
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Frerk Pöppelmeier
@fpoeppelmeier.bsky.social

Are you interested in climate tipping points and considering to go to next year's #PAGES25 #OSM25? Why not submit an abstract to our session 22: Understanding Thresholds, Tipping Points, and Abrupt Climate Change Across Different Spatial-Temporal Scales? www.pages2025.org.cn/Data/List/Se...

pages2025.org.cnSessions - PAGES Shanghai 2025Contact: Dr. Shouting Tuo State Key Laboratory of Marine Geology Tongji University 1239 Siping Road, Shanghai 200092, China Email: pages2025@tongji.edu.cn, Tel.: +86-21-6598 2198

Frerk Pöppelmeier reposted

Frerk Pöppelmeier
@fpoeppelmeier.bsky.social

📌I have an open PhD position funded for 4 years on the topic of performing long-term climate simulations running seamlessly from the past into the future, including proxy comparisons. Get in touch if you are interested.📌 ohws.prospective.ch/public/v1/jo...

ohws.prospective.chUni Bern: PhD student: “Seamlessly simulating climate from the past into the future”Climate and Environmental Physics is a division of the Physics Institute of the University of Bern, Switzerland. We are committed to understand the processes of Earth System on time scales from season...
Frerk Pöppelmeier
@fpoeppelmeier.bsky.social

Only two weeks left to apply to the open postdoc position in my group on improving a fast Earth system model and performing simulations on glacial-interglacial timescales. Feel free to reach out to me if you are interested in the position.

Frerk Pöppelmeier reposted

Frerk Pöppelmeier
@fpoeppelmeier.bsky.social

Are you interested in climate tipping points and considering to go to next year's #PAGES25 #OSM25? Why not submit an abstract to our session 22: Understanding Thresholds, Tipping Points, and Abrupt Climate Change Across Different Spatial-Temporal Scales? www.pages2025.org.cn/Data/List/Se...

pages2025.org.cnSessions - PAGES Shanghai 2025Contact: Dr. Shouting Tuo State Key Laboratory of Marine Geology Tongji University 1239 Siping Road, Shanghai 200092, China Email: pages2025@tongji.edu.cn, Tel.: +86-21-6598 2198