New paper alert ! 🙂 Happy to share our new study published in The Cryosphere ! doi.org/10.5194/tc-1... We modelled the evolution of the Greenland Ice Sheet from the LGM (24 ka) to the present and learned a lot on its former history and dynamics ! @jeremyely.bsky.social @chrisdclark.bsky.social

We're hiring! I'm recruiting a Postdoctoral Research Associate in climate & paleoclimate modeling of the tropical Americas. Come obsess over the tropical rain belt with me! :) Please share w/folks who may be interested. Ad here: wustl.wd1.myworkdayjobs.com/en-US/Extern...

Huge paper for the Arctic Ocean published today in @science.org - a new 30,000 year history of Arctic Ocean sea-ice cover reconstructed from the accumulation of cosmic dust-derived helium-3! www.science.org/doi/10.1126/... (1/n)

PNAS: Six-million-year-old ice discovered in Antarctica offers unprecedented window into a warmer Earth via our NSF COLDEX & US Antarctic Program. ❄️ www.pnas.org/doi/10.1073/...

Not sure if I’m supposed to promote my work as a furloughed government employee, but our paper comparing vegetation communities of the now-submerged central Bering land bridge and modern (Holocene) Bering Sea islands, with implications for the timing of sea-level transgression, is out!

miriamcjones.bsky.social et al.’s #newarticle on Bering Land Bridge (BLB) climate & vegetation during the Last Glacial Maximum shows Bering Sea island vegetation communities reflect the timing of their isolation from the BLB with sea level transgression: doi.org/10.1080/15230430.2025.2557062

It definitely piqued my interest to see Clark et al's reconstruction of sea level for the past 4.5 million years, something I first heard about several years ago. However, upon reading it, I am very surprised that this was published. 🧵 1/11 doi.org/10.1126/scie...

New paper! PhD student Mia Tuccillo has uncovered another big impact of past warming in Greenland: lakes lost oxygen for thousands of years and cyanobacteria took over 🦠 🧪 🦠. It's kinda yikes... With collaborator @geobiomaggie.bsky.social (1/3)

🚨 New paleoclimate proxy paper from a team of INSTAARs, working with colleagues from UC Santa Cruz & U of Iceland. 1st author David Harning now works with CIRES & NOAA, but remains an INSTAAR Affiliate. Congrats all! 👏🏽

New paper on ancient DNA and lipids from Icelandic lakes. This one threw some unexpected results and now has me thinking a lot about lake oxygen’s role in organic matter preservation, the climate proxies derived from them, and past methane cycling. #Paleosky www.nature.com/articles/s43...

Registration for experts interested in serving as Expert Reviewers and providing scientific comments on the First Order Draft of the Special Report on Climate Change and Cities is now open! Register here: apps.ipcc.ch/comments/src... ⚠️ Registration closes 30 Nov2025 🔗 www.ipcc.ch/2025/09/17/p...

🚨New paper!🚨🥳 Delighted to share our new paper out now on global lake brGDGT temperature calibrations: advances, applications and challenges: www.sciencedirect.com/science/arti... @hassfacultyncl.bsky.social @bas.ac.uk @ogu-bristol.bsky.social

Reminder: Applications are open until October 31st! 📣

Know a CU Boulder undergrad who might want to be an Ecology Lab Technician for 8-10 hrs/wk? • Process alpine plant seeds collected in Colorado. • Ideal start date: Oct 1 (or as soon as possible). • Application deadline: Sep 19. Look for student jobs at www.colorado.edu/instaar/jobs

🦣🍖🧬 Fully funded 3-yr PhD in palaeogenomics & bioinformatics! Help me push non-model palaeogenomes beyond their limits @DTU in Denmark. Start: Feb 2026 (flexible) Application deadline: 24 Oct 2025 For details click here: tinyurl.com/BioExtPhD Reposts appreciated 😁

We're recruiting!! Myself along with Nathan Gill, Dylan Schwilk @schwilk.org, and Katharine Suding are recruiting people for Master's, PhD, and postdoc positions in GrassFire, an NSF funded project examining fuels and fire risk in grassland ecosystems across the Southern Great Plains! 🔥🌿🐮

"mentorship is a two-way exchange that energizes and inspires all participants to become active agents of change" tos.org/oceanography...

I'm looking for a driven PhD student to join us at @au.dk and to both generate new paleoclimate data in the lab and work on computational problems to understand climate relationships across timescales. Get in touch if you'd like to hear more, and apply by Nov 1! phd.nat.au.dk/for-applican...

🌋📢 Calling all #tephra researchers! Join us in shaping this new JQS Special Issue. "Beyond the #Eruption – Advances and Applications in Distal Tephra Analysis Across the Geosciences" Deadline: 2 Jan 2026. Further details below: onlinelibrary.wiley.com/page/journal...

The Stanford Cosmogenic Isotope Lab is hiring a new (permanent) Lab Manager. Please share and apply if you are qualified. phxc1b.rfer.us/STANFORDSD1UPF

Out today in Quaternary Science Advances! @cwanket.bsky.social's paper linking terrestrial, marine, and GIA model results to constrain the last (most recent) formation of the Bering Land Bridge to between 40 and 35 thousand years ago: www.sciencedirect.com/science/arti...

Earth scientists know a lot more about getting out of an ice age than going into one. We report an episode of AMOC slowdown at 115 thousand years ago that's likely astronomically forced (via sea-ice) and coincides with a delayed drawdown of atmospheric CO2 @natcomms.nature.com rdcu.be/eALD1

New paper on the Holocene evolution of Pikialasorsuaq (aka North Water Polynya), with implications for the future biodiversity it supports agupubs.onlinelibrary.wiley.com/doi/10.1029/... 🌊 🧪

Isabella Oleksy's Mountain Limnology Lab has taken over a 42-year-old monitoring project in Rocky Mountain National Park. Their investigations reveal how remote alpine watersheds are changing in the Anthropocene www.colorado.edu/instaar/2025... @isabellaoleksy.bsky.social & @jbaron4.bsky.social

Check out our new paper about carbon, productivity and climate over 15,800 years in central Alaska. Out in @aaarjournal.bsky.social this paper pairs new sediment records from Eight Mile Lake with soil cores from the adjacent hillslope. www.tandfonline.com/doi/full/10....

🐚 Out today “Shifting Seas – Understanding Deep-Time Human Impacts on Marine Ecosystems.” 🌊 A theme issue asking how, when, and where humans have impacted oceans over millennia. 🔗 doi.org/10.1098/rstb.2024.0026 🧶 below on how it came to life!...

🚨The Trump Administration is proposing devastating cuts to key national agencies in Colorado that play a vital role in protecting our country, including through cutting-edge research on wildfires, droughts, and more. Senator Bennet and I are fighting back against the attacks on NOAA, CIRES & CIRA 👇🏾

Now published in @agu.org Geophysical Research Letters! What happens to marine archaea when they’re hungry? And what does that mean for the TEX₈₆ paleothermometer? Full paper here: doi.org/10.1029/2025... Thanks to my coauthors and mentors for their support — and stay tuned, more is coming!

Come postdoc in Oslo! 3 years. You design the project! Get in touch with me or others at our museum! Deadline 23 june www.jobbnorge.no/en/available... share and repost !

A new paleoclimatology investigation, led by INSTAAR affiliate @davidharning.bsky.social (@cires.colorado.edu+NOAA NCEI), uncovers a story of ecosystem resilience at a lake in coastal Iceland. The analysis could aid future conservation and climate modeling efforts www.colorado.edu/instaar/2025...

Very excited to have this manuscript out!! During an #NSF Workshop, we brainstormed 100 future questions facing lake ice study today, and how we integrate #remotesensing #modeling #insitu work to get at those questions! @agu.org #OpenAccess

Here’s what turned these Arctic lakes brown. eos.org/articles/ext... Read more in our May issue: bit.ly/Eos-May2025

I am so heartened to this seriously AWESOME #SaveNSF website go up today!!!! Has a take action toolkit with: 1. Press outreach templates 2. Social media toolkit 3. Elected official outreach 4. Talking points Check it out and share widely!!!! Likely more to come. www.savensf.com

🚨 New ocean sediment drilling report INSTAAR Fellow ANNE JENNINGS co-led IODP #Exp400, which collected cores off the NW Greenland glaciated margin in 2023... incl one 978m (3209ft) long! The team's (ongoing) work spans a lot of ice sheet & ocean history publications.iodp.org/proceedings/...

Critical yet often overlooked is that NOAA's Oceanic and Atmospheric Research maintains vital long-term monitoring programs like the CO₂ Keeling Curve that, while essential, often struggle for funding from agencies like NSF that prioritize hypothesis-driven research over sustained observation.

This issue of Quaternary Science Reviews comprises reviews on stable isotopes in different types of records. This is an update of the 2004 issue on “Isotopes in Quaternary Paleoenvironmental Reconstruction (ISOPAL)”, volume 23, issue 7–8, pages 739–992. www.sciencedirect.com/science/arti...

New paper on Iceland! Over the last 20+ years, we've analyzed a bunch of high-resolution datasets from a small lake first studied in the early 90s. If you're interested in Holocene climate, tephra, algal pigments, and Norse settlement, this one might be for you: cp.copernicus.org/articles/21/...

To the world: We are fighting back. Our movement has been silenced by the media here—but we are not backing down. This is what our streets looked like across multiple cities. Tomorrow, there will be more of us! Raise a glass to freedom. —With love, Your American allies.

🧊 New ice core study of the last ice age by Chloe Brashear, Tyler Jones et al. suggests abrupt warming events were preceded by periods of unusually stable temperatures. Shifting sea ice is a potential driver of the phenomenon. Read our story: www.colorado.edu/instaar/2025...

📢 Job Alert! We are looking for a Post-Doc / Research associate (f/m/d) in the field of #MarineGeochemistry at the International Core Repository at the Universität Bremen (A126-25). ⏰ Application- #Deadline is April 1st 2025 Find out more here ➡ www.marum.de/jobs #jobs #wearehiring #Science

An open letter to our federal colleagues and collaborators from CIRES Director Waleed Abdalati: cires.colorado.edu/news/cires-s... "While the value of what you do may not be obvious to some, it benefits all. Your work is so important, and it is a true privilege being on the same team as you."

@noaa.gov, one of the nation’s most prominent scientific agencies, began firing employees yesterday. The agency is expected to lose about 10% of its workforce. 🧵 👇https://apnews.com/article/national-weather-service-layoffs-trump-doge-a65360a1eb2500b7d47c9c966e383f4a

The Glacier Mass Balance Intercomparison Exercise is out! Herculean effort bringing together >200 estimates of glacier loss outside the ice sheets. Bottom line is 273 gigatonnes per year of ice loss since the year 2000! 😲 Open-access article: doi.org/10.1038/s415... 🥼❄️ @natureportfolio.nature.com

New work on how microbiome-moss interactions contribute to acclimation to warming. onlinelibrary.wiley.com/doi/full/10.... Dreaming about fieldwork in Iceland now.

"NOAA is taxpayer-funded, so it is a public good – its services provide safety and security for everyone, not just those who can pay for it." CIRES' @cwiedinm.bsky.social and Kari Bowen explain @noaa.gov's role in U.S. weather forecasts. @us.theconversation.com @colorado.edu

Over 2.5 billion years ago, trillions of tiny Cyanobacteria spent hundreds of millions of years creating an oxygen-rich atmosphere on Earth. Take a deep breath. How are you using your oxygen today? Be present. Give freely. Care for others. Make your ancient microbial cousins proud. Exhale. Repeat.

Folks wanting updates from NSF, they just posted this: new.nsf.gov/executive-or... Stop work order for "conferences, trainings, workshops, considerations for staffing and participant selection, and any other grant activity that uses or promotes the use of DEIA principles and frameworks..."

Godt nytår! I'm hiring an isotope-loving postdoc with applications due January 15th 🇩🇰

In a 🔥 new Nature Communications paper 🔥 led by me, Jacky Austermann, and @bobkopp.net, we show that global mean sea level was likely higher in the Holocene than at 1850. 🎁: rdcu.be/d5fHn 🧵