David Harning
@davidharning.bsky.social
Research Scientist @cires.colorado.edu and NOAA | Arctic paleoclimate | climate solutions | http://davidharning.com
Reposted by David Harning
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...
Postdoctoral Research Associate - Earth, Environmental, and Planetary Sciences
Position Summary The Climate and Paleoclimate Lab in the Department of Earth, Environmental, and Planetary Sciences at WashU in St. Louis seeks a Postdoctoral Research Associate in tropical climate/pa...
wustl.wd1.myworkdayjobs.com
October 29, 2025 at 5:25 PM
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...
Reposted by David Harning
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)
Cosmic dust reveals dynamic shifts in central Arctic sea-ice coverage over the past 30,000 years
Arctic sea-ice loss affects biological productivity, sustenance in coastal communities, and geopolitics. Forecasting these impacts requires mechanistic understanding of how Arctic sea ice responds to ...
www.science.org
November 7, 2025 at 1:08 AM
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)
Reposted by David Harning
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/...
October 28, 2025 at 9:44 PM
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/...
Reposted by David Harning
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
October 15, 2025 at 12:13 PM
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!
Reposted by David Harning
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
October 13, 2025 at 2:14 PM
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
Reposted by David Harning
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...
doi.org/10.1126/scie...
Global mean sea level over the past 4.5 million years
Changes in global mean sea level (GMSL) during the late Cenozoic remain uncertain. We use a reconstruction of changes in δ18O of seawater to reconstruct GMSL since 4.5 million years ago (Ma) that acco...
doi.org
October 18, 2025 at 3:29 AM
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...
doi.org/10.1126/scie...
Reposted by David Harning
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)
With collaborator @geobiomaggie.bsky.social (1/3)
October 1, 2025 at 3:09 AM
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)
With collaborator @geobiomaggie.bsky.social (1/3)
Reposted by David Harning
🚨 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...
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
September 30, 2025 at 6:34 PM
🚨 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...
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
September 24, 2025 at 7:24 PM
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...
Reposted by David Harning
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...
Register here: apps.ipcc.ch/comments/src...
⚠️ Registration closes 30 Nov2025
🔗 www.ipcc.ch/2025/09/17/p...
September 19, 2025 at 3:05 PM
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...
Register here: apps.ipcc.ch/comments/src...
⚠️ Registration closes 30 Nov2025
🔗 www.ipcc.ch/2025/09/17/p...
Reposted by David Harning
🚨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
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
September 19, 2025 at 11:59 AM
🚨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
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
Reposted by David Harning
Reminder: Applications are open until October 31st! 📣
📣 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...
September 15, 2025 at 4:51 PM
Reminder: Applications are open until October 31st! 📣
Reposted by David Harning
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
• 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
September 12, 2025 at 10:00 PM
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
• 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
Reposted by David Harning
🦣🍖🧬 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 😁
Start: Feb 2026 (flexible)
Application deadline: 24 Oct 2025
For details click here: tinyurl.com/BioExtPhD
Reposts appreciated 😁
September 9, 2025 at 7:37 AM
🦣🍖🧬 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 😁
Start: Feb 2026 (flexible)
Application deadline: 24 Oct 2025
For details click here: tinyurl.com/BioExtPhD
Reposts appreciated 😁
Reposted by David Harning
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! 🔥🌿🐮
September 8, 2025 at 8:29 PM
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! 🔥🌿🐮
Reposted by David Harning
"mentorship is a two-way exchange that energizes and inspires all participants to become active agents of change"
tos.org/oceanography...
tos.org/oceanography...
FEATURE ARTICLE • Mentors: The Hidden Beneficiaries of Mentoring | Oceanography
tos.org
September 5, 2025 at 2:20 AM
"mentorship is a two-way exchange that energizes and inspires all participants to become active agents of change"
tos.org/oceanography...
tos.org/oceanography...
Reposted by David Harning
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...
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
September 2, 2025 at 11:44 AM
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...
Get in touch if you'd like to hear more, and apply by Nov 1!
phd.nat.au.dk/for-applican...
Reposted by David Harning
🌋📢 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...
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
August 29, 2025 at 7:46 PM
🌋📢 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...
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...
Reposted by David Harning
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
August 20, 2025 at 9:36 PM
The Stanford Cosmogenic Isotope Lab is hiring a new (permanent) Lab Manager. Please share and apply if you are qualified. phxc1b.rfer.us/STANFORDSD1UPF
Reposted by David Harning
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...
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
August 14, 2025 at 9:17 PM
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...
www.sciencedirect.com/science/arti...
Reposted by David Harning
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
August 14, 2025 at 3:15 PM
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/... 🌊 🧪
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
August 12, 2025 at 4:15 PM
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/... 🌊 🧪
Reposted by David Harning
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
@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
August 4, 2025 at 10:11 PM
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
@isabellaoleksy.bsky.social & @jbaron4.bsky.social
Reposted by David Harning
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....
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
July 31, 2025 at 6:33 PM
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....
www.tandfonline.com/doi/full/10....