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Karlos G. D. Kochhann

@k-kochhann.bsky.social
178 followers 429 following 10 posts

Paleoceanographer and paleoclimatologist; postdoctoral researcher @ GEOMAR; runner, cyclist and swimmer.

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Reposted by Karlos G. D. Kochhann
Vicki Taylor @vickitaylor.bsky.social · 24/09/2026
🚨 new paper 🚨 We present the first multi-site deep-sea temperatures records for the EOT. And it turns out the deep-sea temperature response to the onset of Antarctic glaciation appears to be more complicated than previously assumed… rdcu.be/hkKZbBTsPYxa
https://rdcu.be/hkKZbBTsPYxa
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Karlos G. D. Kochhann @k-kochhann.bsky.social · 14/09/2026
New paper out by our PhD student! We describe the effects of methane degassing on the carbon and oxygen isotopic compositions of foraminiferal shells (doi.org/10.1016/j.ma...). @jysuarezibarra.bsky.social
doi.org
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Reposted by Karlos G. D. Kochhann
GEOMAR Helmholtz Centre for Ocean Research Kiel @geomarkiel.bsky.social · 03/09/2026
This was our GEOMAR Open Day 2026 🌊🚢🔬 Over 2,000 visitors went behind the scenes of marine research! They explored hands-on experiments, visited research vessel ALKOR and joined talks, tours and our Expedition Cinema. 🔗 www.geomar.de/news/article... #GEOMAR #OpenDay
The GEOMAR building from outside. Text: ‘That was our Open Day 2026’. Photo: Lena Petermann, GEOMAR
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Reposted by Karlos G. D. Kochhann
UN Environment Programme @unep.org · 02/09/2026
Global warming is set to cross 1.5°C, pushing climate risks and impacts to increasingly dangerous heights, a new UNEP report warns.   Predicted impacts include extreme weather and threats to human health and economies.
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Reposted by Karlos G. D. Kochhann
GEOMAR Helmholtz Centre for Ocean Research Kiel @geomarkiel.bsky.social · 26/08/2026
Am Sonntag ist Tag der offenen Tür am GEOMAR! Am Sonntag, 30. August 2026, laden wir von 11 bis 17 Uhr wieder zum Tag der offenen Tür am Ostufer ein. Besucher:innen erhalten Einblicke in die Forschung rund um den Ozean. Alle Infos und Programmflyer: www.geomar.de/news/article... Seid ihr dabei?
Tag der offenen Tür am GEOMAR, 30.08.2026, 11–17 Uhr
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Reposted by Karlos G. D. Kochhann
PAGES (Past Global Changes) @pages-ipo.bsky.social · 25/08/2026
📢 Paleoclimate community: your research can help strengthen IPCC AR7. Publish relevant work ahead of the literature deadlines, bring key studies to the attention of chapter authors, and participate in the review process. 🌍 Find out more: pastglobalchanges.org/news/138929
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Karlos G. D. Kochhann @k-kochhann.bsky.social · 24/08/2026
Our PALEOCLIMA project team (Brazilian Antarctic Program) just showcased results at the @scar-antarctic.bsky.social Open Science Meeting; from ice-proximal glacial-interglacial cycles during the Miocene to the record of end-Cretaceous-Paleogene crinoids (doi.org/10.1016/j.gr...).
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Communications Earth & Environment @commsearth.nature.com · 18/08/2026
🌧️Western Amazonia and the tropical Andes have experienced a long-term trend toward wetter conditions over the past 1.93 million years, with greater variability during glacial periods. 👉Read more here: www.nature.com/articles/s43...
nature.com
A two-million-year record reveals long-term increase in precipitation over western Amazonia and the tropical Andes - Communications Earth & Environment
Western Amazonia and the tropical Andes experienced a long-term trend toward wetter conditions over the past 1.93 million years, with greater variability during glacial periods, as revealed by geochem...
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Reposted by Karlos G. D. Kochhann
David Ho @davidho.bsky.social · 04/07/2026
Climate change comes for the Tour de France and no amount of hydration breaks can save it.
cyclingnews.com
'You may decide to cancel a stage' – French regions will be authorised to call off Tour de France stages if extreme heatwaves hit the race
Minister of the Interior issues message to department prefects as more high temperatures are forecast in France this July
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Reposted by Karlos G. D. Kochhann
Greifswald Mire Centre @greifswaldmoor.bsky.social · 29/06/2026
Brazil closer to becoming a Champion Country of the Peatland Breakthrough Brazil's National Committee for Wetlands (CNZU) has recommended that the Brazilian Ministry of the Environment (Ministerio do Meio Ambiente) formally endorse the Peatland Breakthrough and explore a Champion Country role.
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Reposted by Karlos G. D. Kochhann
Nature Geoscience @natgeosci.nature.com · 16/06/2026
⚒️ Article: The burial of terrestrially-derived organic carbon in coastal marine sediments greatly increased during the Paleocene-Eocene Thermal Maximum @climategordon.bsky.social @sotonoceanearth.bsky.social @unisouthampton.bsky.social www.nature.com/articles/s41...
nature.com
Enhanced marine burial of terrestrial organic carbon through the Palaeocene–Eocene Thermal Maximum - Nature Geoscience
The burial of terrestrially derived organic carbon in coastal marine sediments greatly increased during the Palaeocene–Eocene Thermal Maximum, probably helping to draw down a large portion of carbon r...
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Reposted by Karlos G. D. Kochhann
Bridget Wade @bridgetwade.bsky.social · 07/06/2026
Full-time or part-time Research Technician in Micropalaeontology available in my lab @bridgetwade.bsky.social @es-ucl.bsky.social as part of the NERC TONIC Large Grant. Closing date: 18th June 2026. More details: www.ucl.ac.uk/work-at-ucl/... #technician #micropalaeontology #plankton #NERC
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Karlos G. D. Kochhann @k-kochhann.bsky.social · 05/06/2026
Nice days of sampling deep sea cores at the IODP Bremen Core Repository @marumunibremen.bsky.social. We keep coming back as new measurements end up telling us that we should extend or increase the resolution of our paleoclimate records…😅
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Reposted by Karlos G. D. Kochhann
Nature @nature.com · 31/05/2026
Nature research paper: Darkness and body size shaped end-Cretaceous marine extinction patterns go.nature.com/3Q5Mfms
go.nature.com
Darkness and body size shaped end-Cretaceous marine extinction patterns - Nature
Trait-based ecosystem modelling shows that impact-driven darkness and body-size-dependent extinction thresholds, rather than carbon-dioxide increase or acidification, drove most of the observed end-Cretaceous marine extinction patterns.
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Reposted by Karlos G. D. Kochhann
Prof Alessandro Tagliabue @altagliabue.bsky.social · 24/05/2026
Fantastic review on the ocean carbon cycle and climate led by Laure Resplandy that pulls together impressive budgets and tackles some key narratives 🌊 www.science.org/doi/pdf/10.1...
Integrated perspective on ocean carbon cycle:
Untangling facts, fluxes, and fictions
Laure Resplandy1*, Marina Lévy2, Laurent Bopp3
The ocean carbon cycle spans multiple scales and reservoirs, challenging efforts to build a coherent picture and
fostering misconceptions or fragmented narratives in science and public discourse. Common examples include
the belief that the biological processes control the ocean’s carbon sink (i.e., fraction of human CO2 emissions ab-
sorbed by ocean), that restoring coastal ecosystems is highly effective at mitigating climate change, or that whales
substantially contribute to carbon sequestration. We provide a comprehensive review of living and nonliving
ocean carbon stocks and fluxes—from plankton to mangroves, whales, fish, and plastics—and an integrated per-
spective on global ocean carbon cycling, disentangling well-­ supported insights from misconceptions. This syn-
thesis reaffirms the ocean’s key role as a physics-­ and chemistry-­ driven carbon sink, while clarifying the limited
contribution of coastal and open-­ ocean ecosystems to carbon sequestration and climate mitigation. We caution
against frameworks that justify marine conservation through climate mitigation—a narrative useful to draw
attention, but not always robust and unnecessary, since marine biodiversity is worth preserving regardless of its
impact on carbon.
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Karlos G. D. Kochhann @k-kochhann.bsky.social · 22/05/2026
It is amazing to see the different colors of mud that accumulated in western Amazonian wetlands during the Miocene (at about 14 million years ago). Now, the challenge of making sense of their environment meaning begins… @serrapilheira.org
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Reposted by Karlos G. D. Kochhann
David Ho @davidho.bsky.social · 23/11/2024
Cycling is 10 times more important than electric cars for reaching net-zero cities and 100 times more fun.
theconversation.com
Cycling is ten times more important than electric cars for reaching net-zero cities
Active travel can help tackle the climate crisis earlier than electric vehicles – even if you swap the car for a bike for just one trip a day.
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Reposted by Karlos G. D. Kochhann
Prof Ian Hall @ianhall.bsky.social · 07/05/2026
The Amazon’s tipping point may be much closer than expected. Just: 👉 1.5-1.9 °C warming, and 👉 22-28% deforestation could trigger a large-scale ecological transition across 62–77% of the Amazon forest. Why? Deforestation creates a self-reinforcing drying cycle… www.nature.com/articles/s41...
nature.com
Deforestation-induced drying lowers Amazon climate threshold - Nature
The Amazon forest faces a near system-wide transition of 62−77% of the area under a combination of 1.5–1.9 °C global warming and 22−28% deforestation.
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Karlos G. D. Kochhann @k-kochhann.bsky.social · 07/05/2026
Here is our new study showing that the Sr/Ca ratio of ostracod valves can be used to reconstruct bottom water temperatures in the deep time: doi.org/10.1016/j.ev.... It may be particularly useful for shallow marine environments where foraminifera are absent or rare in the sediments.
doi.org
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Reposted by Karlos G. D. Kochhann
Dr. Yiming V. Wang @yimingvwang.bsky.social · 29/04/2026
Our Comment is out today in nature.com/commsenv/ The risk of AI in education is that students may stop thinking. In teaching Earth Science, we use AI differently: to identify friction, contradictions, weak evidence, hidden assumptions, and uncertainty. We call it grounded inquiry. rdcu.be/ffZPd
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Karlos G. D. Kochhann @k-kochhann.bsky.social · 29/04/2026
New paper out @micropalaeosoc.bsky.social showing how high-to-mid latitude planktonic foraminiferal assemblages expanded and contracted their geographic distributions in tandem with changing sea surface temperatures just after the end-Cretaceous mass extinction: doi.org/10.5194/jm-4...
doi.org
Planktic foraminiferal distribution across the Cretaceous–Paleogene (K–Pg) boundary from the Neuquén Basin (Cerro Azul section): biostratigraphy and paleoenvironmental significance
Abstract. The Maastrichtian–Danian time interval corresponds to one of the largest mass extinctions in the Earth's geological history. We investigate changes in planktic foraminiferal assemblages and ...
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Karlos G. D. Kochhann @k-kochhann.bsky.social · 23/04/2026
Our review on the applications of oxygen isotopes chemostratigraphy (doi.org/10.22498/pag...) is out! It is part of a @pages-ipo.bsky.social special issue with contributions by the TIMES community, which aims to recalibrate time scales for the last 100 Ma (pastglobalchanges.org/publications...)
doi.org
Chemostratigraphy using oxygen isotopes of foraminiferal calcite | PAGES
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Reposted by Karlos G. D. Kochhann
PAGES (Past Global Changes) @pages-ipo.bsky.social · 21/04/2026
🥳 It’s out! 📢 New PAGES Magazine: “The essence of time” Explore gaps, challenges & future directions in geological dating - from biostratigraphy to radioisotopic methods. ⭐ Read here: pastglobalchanges.org/publications... #PAGES #Paleoscience #EarthScience @marumunibremen.bsky.social
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Reposted by Karlos G. D. Kochhann
Zeke Hausfather @zekehausfather.com · 20/04/2026
With the latest set of El Niño forecasts, NOAA's CFSv2 model needs to get a larger y-axis scale 😯
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Karlos G. D. Kochhann @k-kochhann.bsky.social · 14/04/2026
Outreach text (in Portuguese) on the record of orbitally-paced hydroclimate changes by Miocene wetlands in western Amazonia: folha.com/fj8zvixb. Our original paper can be found here: doi.org/10.1029/2025.... Research funded by @serrapilheira.org / FAPERGS
folha.com
Ciência Fundamental: O que acontece com a Amazônia quando o clima esquenta?
Sedimentos de um lago do passado amazônico nos dão pistas do futuro do bioma, mostra estudo
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Reposted by Karlos G. D. Kochhann
PAGES (Past Global Changes) @pages-ipo.bsky.social · 14/04/2026
⏳Coming soon: PAGES Magazine – “The Essence of Time” Explore the challenges and future of geological dating: from biostratigraphy to radioisotopic methods. 📬 Free hard copy available, order by tomorrow! pastglobalchanges.org/form/pages-m... #Geoscience #PAGES #EarthScience
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European Space Agency @esa.int · 07/04/2026
✅ #Artemis II update: 'Earthset', 6 April 2026, and 'totality', 7 April, seen from lunar orbit, the Moon eclipses the Sun, a view few humans have ever witnessed (pics: NASA) 🔗 www.nasa.gov/gallery/jour... @exploration.esa.int l
On a black background of space, a blue and white Earth just before 'setting' behind the Moon, in foreground, seen from Artemis II, 6 April 2026Totality seen from lunar orbit, the Moon eclipses the Sun, revealing a view few humans have ever witnessed, a dark disc surrounded by a pale solar corona.
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Gavin Foster @thefosterlab.bsky.social · 03/04/2026
Wow - such a cool image from Artemis II. I love seeing the atmosphere on these sorts of images - such a fragile looking layer of gas but so important to all life on our planet
The Earth form Artemis IIThe Earths Atmosphere
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Karlos G. D. Kochhann @k-kochhann.bsky.social · 01/04/2026
The Late Miocene-Early Pliocene biogenic bloom was also recorded in oligotrophic waters of the South Atlantic Ocean: doi.org/10.1016/j.pa... First paper of Tamires’ PhD thesis (with @clarab.bsky.social).
doi.org
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