Jesse Farmer
@jfarmersalmanac.bsky.social
Assistant Professor of Geology & Paleoclimate @ UMass Boston's School for the Environment. Climate change, nitrogen cycle, carbon cycle, surfing (not necessarily in that order). https://jfarmersalmanac.com
Reposted by Jesse Farmer
No astronomy per se in this week's issue of @science.org, but there is a fascinating study by Pavia et al. that uses cosmic dust to trace sea ice coverage in the Arctic. 3He from micrometeorites records when the ocean was ice free, over the last 30,000 years. 🧪🌊
www.science.org/doi/10.1126/...
www.science.org/doi/10.1126/...
November 6, 2025 at 7:33 PM
No astronomy per se in this week's issue of @science.org, but there is a fascinating study by Pavia et al. that uses cosmic dust to trace sea ice coverage in the Arctic. 3He from micrometeorites records when the ocean was ice free, over the last 30,000 years. 🧪🌊
www.science.org/doi/10.1126/...
www.science.org/doi/10.1126/...
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 Jesse Farmer
Our new study emphasizes the potential importance of the Southern Ocean under ambitious emission mitigation:
agupubs.onlinelibrary.wiley.com/doi/10.1029/..., with an EOS spotlight: eos.org/research-spo....
agupubs.onlinelibrary.wiley.com/doi/10.1029/..., with an EOS spotlight: eos.org/research-spo....
Southern Ocean Heat Burp in a Cooling World
Under net-negative CO2 emissions and global cooling ocean heat release causes substantial centennial scale atmospheric warming The ocean heat release originates from Southern Ocean deep convectio...
agupubs.onlinelibrary.wiley.com
October 22, 2025 at 2:54 PM
Our new study emphasizes the potential importance of the Southern Ocean under ambitious emission mitigation:
agupubs.onlinelibrary.wiley.com/doi/10.1029/..., with an EOS spotlight: eos.org/research-spo....
agupubs.onlinelibrary.wiley.com/doi/10.1029/..., with an EOS spotlight: eos.org/research-spo....
“The reason we care about climate change is it’s the hole in every bucket” 💯👏
If you take the time to read the whole Gates memo (which I did), the bulk of the content was mostly solid and encouraging. Really!
It was the FRAME that was off--very off, from the first line.
And when your framing is off, then how you make decisions and set priorities is off. THAT'S the problem.
It was the FRAME that was off--very off, from the first line.
And when your framing is off, then how you make decisions and set priorities is off. THAT'S the problem.
October 30, 2025 at 6:28 PM
“The reason we care about climate change is it’s the hole in every bucket” 💯👏
Reposted by Jesse Farmer
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/...
Shocking to see a landfall of a storm of this magnitude in any ocean basin. My thoughts are with those in Jamaica and throughout the western Caribbean who are in the path of #Melissa
October 28, 2025 at 4:49 PM
Shocking to see a landfall of a storm of this magnitude in any ocean basin. My thoughts are with those in Jamaica and throughout the western Caribbean who are in the path of #Melissa
Reposted by Jesse Farmer
New research from Prof. Xin Sun of Biology offers an improved understanding of microbial ecology and geochemistry—key to forecasting global emissions in response to natural and man-made climate change. @upenn.edu @xinsun-putiger.bsky.social
Can tiny ocean organisms offer the key to better climate modeling? | Penn Today
In the shadowy layers of the Pacific, microbes decide how much nitrous oxide—a potent greenhouse gas—rises skyward. New research from Penn’s Xin Sun offers an improved understanding of microbial ecolo...
bit.ly
October 22, 2025 at 4:04 PM
New research from Prof. Xin Sun of Biology offers an improved understanding of microbial ecology and geochemistry—key to forecasting global emissions in response to natural and man-made climate change. @upenn.edu @xinsun-putiger.bsky.social
Reposted by Jesse Farmer
New paper out on @natcomms.nature.com!
We found recurring deep ocean oxygen minimum events in the Pacific Southern Ocean during Marine Isotope Stage 11, that are linked with perturbed Antarctic Bottom Water formation driven by West Antarctic Ice Sheet destabilization. www.nature.com/articles/s41...
We found recurring deep ocean oxygen minimum events in the Pacific Southern Ocean during Marine Isotope Stage 11, that are linked with perturbed Antarctic Bottom Water formation driven by West Antarctic Ice Sheet destabilization. www.nature.com/articles/s41...
Southern Ocean evidence for recurring West Antarctic Ice Sheet destabilization during Marine Isotope Stage 11 - Nature Communications
Recurring deep ocean oxygen minimum events occur in the Pacific Southern Ocean during the warm climate interval Marine Isotope Stage 11. They are linked with perturbed Antarctic Bottom Water formation...
www.nature.com
October 21, 2025 at 6:52 AM
New paper out on @natcomms.nature.com!
We found recurring deep ocean oxygen minimum events in the Pacific Southern Ocean during Marine Isotope Stage 11, that are linked with perturbed Antarctic Bottom Water formation driven by West Antarctic Ice Sheet destabilization. www.nature.com/articles/s41...
We found recurring deep ocean oxygen minimum events in the Pacific Southern Ocean during Marine Isotope Stage 11, that are linked with perturbed Antarctic Bottom Water formation driven by West Antarctic Ice Sheet destabilization. www.nature.com/articles/s41...
Reposted by Jesse Farmer
New paper(s) alert! Check out @agu.org Palaeoceanography & Paleoclimate. Including our piece on best practices going forward for d11B-CO2 reconstructions. agupubs.onlinelibrary.wiley.com/doi/10.1029/...
including @case4climate.bsky.social, @michaelhenehan.bsky.social,... @eleniwater.bsky.social.
including @case4climate.bsky.social, @michaelhenehan.bsky.social,... @eleniwater.bsky.social.
Perspectives for Best Practices in Boron‐Based CO2 Reconstruction
Boron isotopes are an important marine paleoclimate proxy to reconstruct past ocean pH and atmospheric carbon dioxide in geological time Sources of uncertainty of past CO2 estimation shifts from ...
agupubs.onlinelibrary.wiley.com
October 9, 2025 at 12:59 PM
New paper(s) alert! Check out @agu.org Palaeoceanography & Paleoclimate. Including our piece on best practices going forward for d11B-CO2 reconstructions. agupubs.onlinelibrary.wiley.com/doi/10.1029/...
including @case4climate.bsky.social, @michaelhenehan.bsky.social,... @eleniwater.bsky.social.
including @case4climate.bsky.social, @michaelhenehan.bsky.social,... @eleniwater.bsky.social.
Reposted by Jesse Farmer
Tiny fossils called foraminifera lie buried in marine sediments.
Their shells display astonishing diversity from spiraling forms to chambered clusters and even architectures that resemble miniature buildings.
But what if this morphological variety could be explained by only a few simple rules? 1/n
Their shells display astonishing diversity from spiraling forms to chambered clusters and even architectures that resemble miniature buildings.
But what if this morphological variety could be explained by only a few simple rules? 1/n
October 5, 2025 at 10:18 AM
Tiny fossils called foraminifera lie buried in marine sediments.
Their shells display astonishing diversity from spiraling forms to chambered clusters and even architectures that resemble miniature buildings.
But what if this morphological variety could be explained by only a few simple rules? 1/n
Their shells display astonishing diversity from spiraling forms to chambered clusters and even architectures that resemble miniature buildings.
But what if this morphological variety could be explained by only a few simple rules? 1/n
Very excited to be a part of this epic journey with @oceanandclimate.bsky.social. Check out our #NSFfunded paper published in @science.org today & his thread below. After that, come back here for more... (1/n)
Today, we published a study long in the making on how upper and subsurface tropical Pacific waters responded (and maybe will adjust) to warmer global climate. Here’s the story of how we got here after 15 years. many authors but shout out @jfarmersalmanac.bsky.social
🌊
www.science.org/doi/10.1126/...
🌊
www.science.org/doi/10.1126/...
Persistent eastern equatorial Pacific Ocean upwelling since the warm Pliocene
Upwelling generates a nutrient-rich “cold tongue” in the eastern equatorial Pacific Ocean (EEP), with impacts on global climate, oceanic biological productivity, and the carbon cycle. The cold tongue ...
www.science.org
October 3, 2025 at 1:24 AM
Very excited to be a part of this epic journey with @oceanandclimate.bsky.social. Check out our #NSFfunded paper published in @science.org today & his thread below. After that, come back here for more... (1/n)
Reposted by Jesse Farmer
Electricity now costs 267% more (!!) for 1 month vs. what it cost 5 years ago near data center hotspots. Awesome reporting from Josh Saul @dinabass.bsky.social Leonardo Nicoletti @naurtorious.bsky.social Demetrios Pogkas (gift link) www.bloomberg.com/graphics/202...
AI Data Centers Are Sending Power Bills Soaring
Wholesale electricity costs as much as 267% more than it did five years ago in areas near data centers. That’s being passed on to customers.
www.bloomberg.com
September 29, 2025 at 10:26 PM
Electricity now costs 267% more (!!) for 1 month vs. what it cost 5 years ago near data center hotspots. Awesome reporting from Josh Saul @dinabass.bsky.social Leonardo Nicoletti @naurtorious.bsky.social Demetrios Pogkas (gift link) www.bloomberg.com/graphics/202...
I received a GRFP as a 2nd year PhD student. It opened up an avenue of research that my lab is still focused on today. And I’ve got two awesome 2nd year students who were assembling competitive GRFP applications.
I’m done with this program.
I’m done with this program.
NSF today released instructions for the next round of applicants to its Graduate Research Fellowship Program. A key group—second-year Ph.D. students—is no longer eligible, and students who are still able to apply will face an unusually narrow timeframe. https://scim.ag/3KlQkQk
‘Completely shattered.’ Changes to NSF’s graduate student fellowship spur outcry
The announcement comes months later than usual, leaving many would-be applicants stranded
www.science.org
September 27, 2025 at 2:08 AM
I received a GRFP as a 2nd year PhD student. It opened up an avenue of research that my lab is still focused on today. And I’ve got two awesome 2nd year students who were assembling competitive GRFP applications.
I’m done with this program.
I’m done with this program.
Reposted by Jesse Farmer
Really cool paper looking at the onset/ongoing initiation of subduction of the Caribbean plate beneath the Isthmus of Panama.
And another call for the paleo and bio people to deal with North America and South America being in contact with each other since at least the Miocene, not the Pleistocene.*
And another call for the paleo and bio people to deal with North America and South America being in contact with each other since at least the Miocene, not the Pleistocene.*
Breaking the Caribbean Plate: Subduction Initiation Beneath the Northern Margin of Panama
We present a newly relocated earthquake catalog for Northwestern South America and eastern Panama This catalog includes the 25 May 2025 Mw 6.5 earthquake and aftershocks that show subduction of t...
agupubs.onlinelibrary.wiley.com
September 24, 2025 at 8:07 PM
Really cool paper looking at the onset/ongoing initiation of subduction of the Caribbean plate beneath the Isthmus of Panama.
And another call for the paleo and bio people to deal with North America and South America being in contact with each other since at least the Miocene, not the Pleistocene.*
And another call for the paleo and bio people to deal with North America and South America being in contact with each other since at least the Miocene, not the Pleistocene.*
Reposted by Jesse Farmer
A quick summary by me of a new instance of an old story.
@realclimate.org Time and Tide Gauges wait for no Voortman www.realclimate.org/index.php/ar...
@realclimate.org Time and Tide Gauges wait for no Voortman www.realclimate.org/index.php/ar...
RealClimate: Time and Tide Gauges wait for no Voortman
RealClimate: Here we go again. An obscure, methodologically poor, paper published with little to no review makes a convenient point and gets elevated into supposedly 'blockbusting' science by the merc...
www.realclimate.org
September 18, 2025 at 12:31 PM
A quick summary by me of a new instance of an old story.
@realclimate.org Time and Tide Gauges wait for no Voortman www.realclimate.org/index.php/ar...
@realclimate.org Time and Tide Gauges wait for no Voortman www.realclimate.org/index.php/ar...
Reposted by Jesse Farmer
The special issue @quantamagazine.bsky.social on Climate Science just dropped and I know what my weekend readings is gonna be 👍🏻 www.quantamagazine.org/how-we-came-...
How We Came To Know Earth | Quanta Magazine
Climate science is the most significant scientific collaboration in history. This series from Quanta Magazine guides you through basic climate science — from quantum effects to ancient hothouses, from...
www.quantamagazine.org
September 17, 2025 at 1:07 AM
The special issue @quantamagazine.bsky.social on Climate Science just dropped and I know what my weekend readings is gonna be 👍🏻 www.quantamagazine.org/how-we-came-...
Reposted by Jesse Farmer
I would just like to point out that this is a spectacular choice of cover image for this story.
🔥 The world’s top climate scientists have found that global warming is accelerating. Oceans are rising faster than ever, and the 1.5°C target is slipping away, but there’s still a narrow path forward. #ClimateAction
Climate change is accelerating, scientists find in ‘grim’ report » Yale Climate Connections
They warn that humanity is just three years from overshooting the Paris Agreement’s 1.5°C target, with seas rising faster than ever. But the report also contains a little bit of good news.
yaleclimateconnections.org
September 16, 2025 at 1:43 PM
I would just like to point out that this is a spectacular choice of cover image for this story.
Reposted by Jesse Farmer
Hot off the press: We can provide for the first time a systematic attribution of recent #heatwaves to the emissions of #carbon_majors. Essential new #Nature article coordinated by @yannquilcaille.bsky.social at @ethz.ch, with numerous contributors @usyseth.bsky.social:
www.nature.com/articles/s41...
www.nature.com/articles/s41...
www.nature.com
September 10, 2025 at 3:12 PM
Hot off the press: We can provide for the first time a systematic attribution of recent #heatwaves to the emissions of #carbon_majors. Essential new #Nature article coordinated by @yannquilcaille.bsky.social at @ethz.ch, with numerous contributors @usyseth.bsky.social:
www.nature.com/articles/s41...
www.nature.com/articles/s41...
Congratulations to @paleonotthediet.bsky.social for a banner week at ICP15! Really excited to see tons of cool data from Exp 383 that will be hitting the presses soon…
Especially honored to have received Honorable Mention in the Biogeochemical and Climate session. Could not have done it without my advisor @jfarmersalmanac.bsky.social and colleagues for their guidance and support. Already looking forward to #ICP16
September 6, 2025 at 9:22 AM
Congratulations to @paleonotthediet.bsky.social for a banner week at ICP15! Really excited to see tons of cool data from Exp 383 that will be hitting the presses soon…
Reposted by Jesse Farmer
Future (and past) @climatecerege.bsky.social superstar @antacl.bsky.social giving her #ICP15 talk now. Modelling the Indian monsoon in the Miocene, and some important praise to the organisers for their diverse programme of speakers. Bravo!
September 4, 2025 at 4:41 AM
Future (and past) @climatecerege.bsky.social superstar @antacl.bsky.social giving her #ICP15 talk now. Modelling the Indian monsoon in the Miocene, and some important praise to the organisers for their diverse programme of speakers. Bravo!
Reposted by Jesse Farmer
Next up #ICP15: @jfarmersalmanac.bsky.social gave a fantastic talk on the utility & current+plausible future applications of foraminiferal-bound δ¹⁵N—with a focus on last glacial #Arctic #paleoceanography, including implications for Bering Strait exposure and global sea-level change.
September 1, 2025 at 6:17 AM
Next up #ICP15: @jfarmersalmanac.bsky.social gave a fantastic talk on the utility & current+plausible future applications of foraminiferal-bound δ¹⁵N—with a focus on last glacial #Arctic #paleoceanography, including implications for Bering Strait exposure and global sea-level change.
Very cool result here on the enigmatic M2 event!
New paper! Check out @zifeiyang.bsky.social gorgeous data from M2 glaciation (3.3Ma) - stunning Melonis Mg/Ca temperature records allow us to be confident about ice growth, but this was not like later glaciations following iNHG, we think gateways were more important: www.nature.com/articles/s41...
Major sea level fall during the Pliocene M2 glaciation - Nature Communications
This study refines benthic foraminiferal Mg/Ca paleothermometry to reduce uncertainties to ±0.2-0.3 °C, which was then applied in Atlantic and Pacific sediment cores to reconstruct Mid-Pliocene M2 gla...
www.nature.com
August 18, 2025 at 12:57 PM
Very cool result here on the enigmatic M2 event!
Reposted by Jesse Farmer
New paper! Check out @zifeiyang.bsky.social gorgeous data from M2 glaciation (3.3Ma) - stunning Melonis Mg/Ca temperature records allow us to be confident about ice growth, but this was not like later glaciations following iNHG, we think gateways were more important: www.nature.com/articles/s41...
Major sea level fall during the Pliocene M2 glaciation - Nature Communications
This study refines benthic foraminiferal Mg/Ca paleothermometry to reduce uncertainties to ±0.2-0.3 °C, which was then applied in Atlantic and Pacific sediment cores to reconstruct Mid-Pliocene M2 gla...
www.nature.com
August 18, 2025 at 11:11 AM
New paper! Check out @zifeiyang.bsky.social gorgeous data from M2 glaciation (3.3Ma) - stunning Melonis Mg/Ca temperature records allow us to be confident about ice growth, but this was not like later glaciations following iNHG, we think gateways were more important: www.nature.com/articles/s41...
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 Jesse Farmer
🚨 New Paper Alert! 🚨
We reconstructed past ocean salinity in one of the largest Subantarctic Mode Water production centers on the planet: the southeast Indian Ocean. We found a rapid increase in SAMW salinity during the Last Deglaciation.
Where did this salt come from? We argue the deep ocean. 🧪🌊
We reconstructed past ocean salinity in one of the largest Subantarctic Mode Water production centers on the planet: the southeast Indian Ocean. We found a rapid increase in SAMW salinity during the Last Deglaciation.
Where did this salt come from? We argue the deep ocean. 🧪🌊
Elevated shallow water salinity in the deglacial Indian Ocean was sourced from the deep - Nature Geoscience
Increased salinity of Subantarctic Mode Water during the initial phase of the Last Deglaciation could have enhanced deep water formation in the North Atlantic, according to proxy records from a sedime...
www.nature.com
August 6, 2025 at 4:31 PM
🚨 New Paper Alert! 🚨
We reconstructed past ocean salinity in one of the largest Subantarctic Mode Water production centers on the planet: the southeast Indian Ocean. We found a rapid increase in SAMW salinity during the Last Deglaciation.
Where did this salt come from? We argue the deep ocean. 🧪🌊
We reconstructed past ocean salinity in one of the largest Subantarctic Mode Water production centers on the planet: the southeast Indian Ocean. We found a rapid increase in SAMW salinity during the Last Deglaciation.
Where did this salt come from? We argue the deep ocean. 🧪🌊