Lightnews — Scholar-powered news

Reposted by David Harning

Yarrow Axford @yarrowaxford.bsky.social · 8d

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)

Earth scientists Maggie Osburn and Mia Tuccillo bag up plant samples in a rocky Greenland landscape, with an iceberg-spotted fjord and glacier-covered mountains in the background.

4 23 99

Reposted by David Harning

INSTAAR 🏳️‍🌈 @instaar.bsky.social · 8d

🚨 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! 👏🏽

David Harning @davidharning.bsky.social · 14d

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...

Both redox potential and climate control molecular proxies in Icelandic Holocene lake sediments

Communications Earth & Environment - Recovery of complementary materials from well-ventilated and seasonally stratified lakes can allow reliable reconstruction of local temperature and...

www.nature.com

1 1 8

David Harning @davidharning.bsky.social · 14d

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...

Both redox potential and climate control molecular proxies in Icelandic Holocene lake sediments

Communications Earth & Environment - Recovery of complementary materials from well-ventilated and seasonally stratified lakes can allow reliable reconstruction of local temperature and...

www.nature.com

4 12

Reposted by David Harning

IPCC @ipcc.bsky.social · 19d

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...

1 24 24

Reposted by David Harning

Emma Pearson @geochemem.bsky.social · 19d

🚨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

Development of new global lake brGDGT-temperature calibrations: advances, applications, challenges, and recommendations

Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are a group of temperature-sensitive membrane lipids found in bacteria that have been widely …

www.sciencedirect.com

2 4 8

Reposted by David Harning

Arctic Data Center @arcticdatactr.bsky.social · 23d

Reminder: Applications are open until October 31st! 📣

Arctic Data Center @arcticdatactr.bsky.social · Sep 4

📣 Upcoming data science training: March 2-6, 2026! Applications are now OPEN for our course Reproducible Approaches to Arctic Research Using R. This training is held on Zoom (in Pacific Time) and will be our only training of 2026, so don’t miss the chance to apply! forms.gle/Tv6enduXfHxX...

2 2

Reposted by David Harning

Ocean Carbon & Biogeochemistry (OCB) @usocb.bsky.social · 26d

Call for SSC nominations - due Oct 24.
AND join us Sept 23 at 3p for a info webinar on submitting your activity proposal to us + highlights of recent successful proposals. mailchi.mp/whoi/2025-oc...

Call for SSC nominations + proposal info webinar

mailchi.mp

3 4

Reposted by David Harning

INSTAAR 🏳️‍🌈 @instaar.bsky.social · 26d

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

Alpine wildflowers bloom on the tundra of Niwot Ridge. Photo by William Bowman.

1 8

Reposted by David Harning

Mick Westbury @mick2474.bsky.social · 29d

🦣🍖🧬 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 😁

2 54 52

Reposted by David Harning

Jon Henn @hennhouse.bsky.social · Sep 8

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! 🔥🌿🐮

A grassland on a sunny day near Boulder, CO

1 24 30

Reposted by David Harning

Kris Karnauskas @oceansclimatecu.bsky.social · Sep 5

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

FEATURE ARTICLE • Mentors: The Hidden Beneficiaries of Mentoring | Oceanography

tos.org

3 3 5

Reposted by David Harning

Rachel Lupien @loopdlupien.bsky.social · Sep 2

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...

phd.nat.au.dk

8 3

Reposted by David Harning

Danielle McLean @danmclean.bsky.social · Aug 29

🌋📢 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...

Journal of Quaternary Science Call for Papers Beyond the Eruption: Advances and applications in distal tephra analysis across the Geosciences

<em>Journal of Quaternary Science</em> publishes papers on any field of Quaternary research, advancing understanding of earth's history over the last 2.58 million years.

onlinelibrary.wiley.com

9 11

Reposted by David Harning

Jane Willenbring @geojane.bsky.social · Aug 20

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

Cosmogenic Isotope Laboratory Manager in Doerr School of Sustainability, Stanford, California, United States

The Stanford Cosmogenic Isotope shared laboratory within Stanford University’s Doerr School of Sustainability (SDSS) is seeking an experienced.....

phxc1b.rfer.us

1 17 22

Reposted by David Harning

Jesse Farmer @jfarmersalmanac.bsky.social · Aug 14

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...

Converging evidence constrains late pleistocene bering land bridge history

The Bering Land Bridge was an important biotic corridor and climatic modifier during the Pleistocene (2.58 million to 11,700 thousand years ago [ka]).…

www.sciencedirect.com

1 6 19

Reposted by David Harning

Yuxin Zhou @yzhouclimate.bsky.social · Aug 14

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

Abrupt weakening of deep Atlantic circulation at the last glacial inception - Nature Communications

Zhou et al. report an abrupt weakening of the Atlantic Meridional Overturning Circulation at the last glacial inception. The observed circulation slowdown could explain the delayed timing of the atmos...

www.nature.com

1 15 34

David Harning @davidharning.bsky.social · Aug 12

#PaleoSky

2

David Harning @davidharning.bsky.social · Aug 12

Let me know if you can’t access - I’m happy to share a copy!

1 4

David Harning @davidharning.bsky.social · Aug 12

@cires.colorado.edu @instaar.bsky.social

2

David Harning @davidharning.bsky.social · Aug 12

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/... 🌊 🧪

Spatiotemporal Variability in the Holocene Extent of Pikialasorsuaq (North Water Polynya), Baffin Bay

We reconstruct the Holocene variability of Pikialasorsuaq using foraminifera and geochemistry from 4 marine sediment records Upper water column stratification, low sea ice, and low primary produc...

agupubs.onlinelibrary.wiley.com

4 4 11

Reposted by David Harning

INSTAAR 🏳️‍🌈 @instaar.bsky.social · Aug 4

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

Air pollution and warming are changing Colorado’s remote alpine lakes

The Oleksy lab has taken over a 42-year-old monitoring project in Rocky Mountain National Park. Their investigations reveal how remote alpine watersheds are

www.colorado.edu

13 26

Reposted by David Harning

Leah Marshall @leahpmarshall.bsky.social · Jul 31

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....

A 15,800 year record of productivity, carbon accumulation and environmental change at Eight Mile Lake and its catchment, central Alaska

Despite their efficient burial of organic carbon (OC), the role of high-latitude lakes in storing and processing OC under changing climates is poorly understood. We investigate a 15,800 year sedime...

www.tandfonline.com

1 2 8

Reposted by David Harning

Luke E Holman @lukeeholman.bsky.social · Jul 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!...

Shifting seas: understanding deep-time human impacts on marine ecosystems | Philosophical Transactions of the Royal Society B: Biological Sciences

Humans have interacted with, and impacted, marine ecosystems for millennia. During this time, the oceans have experienced ecosystem degradation through harvesting, habitat change, pollution, the introduction of invasive species and climate change. Despite ...

doi.org

1 9 17

Reposted by David Harning

Rep. Joe Neguse @neguse.house.gov · Jul 3

🚨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 👇🏾

3 29 110

Reposted by David Harning

Ronnie Rattanasriampaipong @paleolipidrr.bsky.social · Jun 21

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!

A Nutrient Effect on the TEX86 Paleotemperature Proxy

Nutrient stress alters GDGT distributions in marine sediments, resulting in elevated TEX86 ${\text{TEX}}_{86}$ values beyond those related to thermal effects Paleoclimate case studies from the Ar...

doi.org

5 15 28