Dr. Nina Davtian (she/her/hers)
@ninadavtian.bsky.social
@cnrs-insu.bsky.social researcher at @climatecerege.bsky.social.
Using biomarkers to study climate, ocean, and environment of the past.
@icta-uab.bsky.social alumna.
ORCID: https://orcid.org/0000-0002-3047-6064
🇫🇷 -> 🇪🇸 -> 🇫🇷
Using biomarkers to study climate, ocean, and environment of the past.
@icta-uab.bsky.social alumna.
ORCID: https://orcid.org/0000-0002-3047-6064
🇫🇷 -> 🇪🇸 -> 🇫🇷
Pinned
Hello! 👋🏻
Trained as a geologist, I do paleo-reconstructions using molecular fossils, aka biomarkers.
My favorite biomarkers are archaeal and bacterial membrane-spanning lipids—glycerol dialkyl glycerol tetraethers, GDGTs.
A 🧵 of 🧵 on my five most significant papers in chronological order: 👇🏻
(1/7)
Trained as a geologist, I do paleo-reconstructions using molecular fossils, aka biomarkers.
My favorite biomarkers are archaeal and bacterial membrane-spanning lipids—glycerol dialkyl glycerol tetraethers, GDGTs.
A 🧵 of 🧵 on my five most significant papers in chronological order: 👇🏻
(1/7)
Reposted by Dr. Nina Davtian (she/her/hers)
My new video…
#Climate Change Impacts on #Ocean Light in #Arctic #Ecosystems
Arctic sea ice and snow, storm-driven waves, clouds, ozone, air and ocean temperature, and chlorophyll-a all affect seasonal absorption and reflection of light…
youtu.be/RMGfrlCmZ2g?...
#Climate Change Impacts on #Ocean Light in #Arctic #Ecosystems
Arctic sea ice and snow, storm-driven waves, clouds, ozone, air and ocean temperature, and chlorophyll-a all affect seasonal absorption and reflection of light…
youtu.be/RMGfrlCmZ2g?...
Climate Change Impacts on Ocean Light in Arctic Ecosystems
YouTube video by Paul Beckwith
youtu.be
November 13, 2025 at 7:23 PM
My new video…
#Climate Change Impacts on #Ocean Light in #Arctic #Ecosystems
Arctic sea ice and snow, storm-driven waves, clouds, ozone, air and ocean temperature, and chlorophyll-a all affect seasonal absorption and reflection of light…
youtu.be/RMGfrlCmZ2g?...
#Climate Change Impacts on #Ocean Light in #Arctic #Ecosystems
Arctic sea ice and snow, storm-driven waves, clouds, ozone, air and ocean temperature, and chlorophyll-a all affect seasonal absorption and reflection of light…
youtu.be/RMGfrlCmZ2g?...
Reposted by Dr. Nina Davtian (she/her/hers)
I'm super happy to announce that the great Sarah Feakins will be taking over as Editor-in-Chief of Paleoceanography and Paleoclimatology. My term is ending at the end of this year. It's been a terrific adventure since I started in January 2020. eos.org/editors-vox/...
Announcing New AGU Journal Editors-in-Chief Starting in 2026 - Eos
AGU is excited to welcome new Editors-in-Chief for five of our journals in 2026.
eos.org
November 13, 2025 at 7:57 PM
I'm super happy to announce that the great Sarah Feakins will be taking over as Editor-in-Chief of Paleoceanography and Paleoclimatology. My term is ending at the end of this year. It's been a terrific adventure since I started in January 2020. eos.org/editors-vox/...
Reposted by Dr. Nina Davtian (she/her/hers)
AGU is calling on Congress to finish full-year appropriations for science agencies—and we need your voice.
📢 Read more from our president, Brandon Jones, who reminds us that together, we can keep science standing strong: buff.ly/prxry8C
#ScienceIsEssential #AGUAdvocacy #SupportScience
📢 Read more from our president, Brandon Jones, who reminds us that together, we can keep science standing strong: buff.ly/prxry8C
#ScienceIsEssential #AGUAdvocacy #SupportScience
Don’t Just Reopen Government. Recommit to Science.
The United States has just come through the longest government shutdown in its history—a period of deep uncertainty that exacerbated hardships for the nation. Some scientists still reported for duty…
fromtheprow.agu.org
November 13, 2025 at 1:45 PM
AGU is calling on Congress to finish full-year appropriations for science agencies—and we need your voice.
📢 Read more from our president, Brandon Jones, who reminds us that together, we can keep science standing strong: buff.ly/prxry8C
#ScienceIsEssential #AGUAdvocacy #SupportScience
📢 Read more from our president, Brandon Jones, who reminds us that together, we can keep science standing strong: buff.ly/prxry8C
#ScienceIsEssential #AGUAdvocacy #SupportScience
Reposted by Dr. Nina Davtian (she/her/hers)
The U.S. has just emerged from the longest government shutdown in its history — a period of deep uncertainty that put science, safety, and resilience at risk. 🧵
November 13, 2025 at 1:45 PM
The U.S. has just emerged from the longest government shutdown in its history — a period of deep uncertainty that put science, safety, and resilience at risk. 🧵
Reposted by Dr. Nina Davtian (she/her/hers)
426.31 parts per million (ppm) CO2 in air 12-Nov-2025
keelingcurve.ucsd.edu
keelingcurve.ucsd.edu
The Keeling Curve
The Keeling Curve is a daily record of global atmospheric carbon dioxide concentration maintained by Scripps Institution of Oceanography at UC San Diego.
keelingcurve.ucsd.edu
November 13, 2025 at 5:16 PM
426.31 parts per million (ppm) CO2 in air 12-Nov-2025
keelingcurve.ucsd.edu
keelingcurve.ucsd.edu
Reposted by Dr. Nina Davtian (she/her/hers)
🔍 Le Guichet de la Donnée (GDsAM) du site d’Aix-Marseille, labellisé Atelier de la Donnée, vous accompagne sur toutes vos problématiques "données de la recherche" !
November 13, 2025 at 3:50 PM
🔍 Le Guichet de la Donnée (GDsAM) du site d’Aix-Marseille, labellisé Atelier de la Donnée, vous accompagne sur toutes vos problématiques "données de la recherche" !
Reposted by Dr. Nina Davtian (she/her/hers)
#Actualité ☀️🌍
Avez-vous pu observer des aurores boréales ces derniers jours ?
On fait le point sur l'activité solaire intense observée grâce aux Services Nationaux d’Observation de l’INSU, en collaboration avec l'OFRAME et leur bulletin de météorologie de l’espace.
➡️ bit.ly/4oHobm6
Avez-vous pu observer des aurores boréales ces derniers jours ?
On fait le point sur l'activité solaire intense observée grâce aux Services Nationaux d’Observation de l’INSU, en collaboration avec l'OFRAME et leur bulletin de météorologie de l’espace.
➡️ bit.ly/4oHobm6
November 13, 2025 at 3:57 PM
#Actualité ☀️🌍
Avez-vous pu observer des aurores boréales ces derniers jours ?
On fait le point sur l'activité solaire intense observée grâce aux Services Nationaux d’Observation de l’INSU, en collaboration avec l'OFRAME et leur bulletin de météorologie de l’espace.
➡️ bit.ly/4oHobm6
Avez-vous pu observer des aurores boréales ces derniers jours ?
On fait le point sur l'activité solaire intense observée grâce aux Services Nationaux d’Observation de l’INSU, en collaboration avec l'OFRAME et leur bulletin de météorologie de l’espace.
➡️ bit.ly/4oHobm6
Reposted by Dr. Nina Davtian (she/her/hers)
It turns out that no matter where you live, or how rich your country is, we all spend roughly 78 minutes a day traveling.
Eric Galbraith, lead author of a new ICTA-UAB study with McGill University, explains why this is so important.
www.uab.cat/web/sala-de-...
Eric Galbraith, lead author of a new ICTA-UAB study with McGill University, explains why this is so important.
www.uab.cat/web/sala-de-...
November 13, 2025 at 4:24 PM
It turns out that no matter where you live, or how rich your country is, we all spend roughly 78 minutes a day traveling.
Eric Galbraith, lead author of a new ICTA-UAB study with McGill University, explains why this is so important.
www.uab.cat/web/sala-de-...
Eric Galbraith, lead author of a new ICTA-UAB study with McGill University, explains why this is so important.
www.uab.cat/web/sala-de-...
Reposted by Dr. Nina Davtian (she/her/hers)
METEO DE L'ESPACE / AURORES BOREALES
Cette semaine nous sommes en plein orage magnétique. Notre étoile nous bombarde de particules de haute énergie.
Le saviez vous ? Le @cnrs-insu.bsky.social a labelisé des services nationaux d'observation dédiés à ces phénomènes.
www.insu.cnrs.fr/fr/cnrsinfo/...
Cette semaine nous sommes en plein orage magnétique. Notre étoile nous bombarde de particules de haute énergie.
Le saviez vous ? Le @cnrs-insu.bsky.social a labelisé des services nationaux d'observation dédiés à ces phénomènes.
www.insu.cnrs.fr/fr/cnrsinfo/...
Éruptions solaires de novembre 2025 : intense tempête de particules énergétiques
Au cours des dernières 48 heures, l’activité solaire a été exceptionnellement intense, caractérisée par la survenue de plusie
www.insu.cnrs.fr
November 13, 2025 at 4:28 PM
METEO DE L'ESPACE / AURORES BOREALES
Cette semaine nous sommes en plein orage magnétique. Notre étoile nous bombarde de particules de haute énergie.
Le saviez vous ? Le @cnrs-insu.bsky.social a labelisé des services nationaux d'observation dédiés à ces phénomènes.
www.insu.cnrs.fr/fr/cnrsinfo/...
Cette semaine nous sommes en plein orage magnétique. Notre étoile nous bombarde de particules de haute énergie.
Le saviez vous ? Le @cnrs-insu.bsky.social a labelisé des services nationaux d'observation dédiés à ces phénomènes.
www.insu.cnrs.fr/fr/cnrsinfo/...
Reposted by Dr. Nina Davtian (she/her/hers)
Taking the Monte Carlo out of Monte Carlo
Notes on a paper about a systematic approach for reducing the size of ensembles needed for Monte Carlo style uncertainty calculations.
diagrammonkey.wordpress.com/2025/11/13/t...
Notes on a paper about a systematic approach for reducing the size of ensembles needed for Monte Carlo style uncertainty calculations.
diagrammonkey.wordpress.com/2025/11/13/t...
Taking the Monte Carlo out of Monte Carlo
A typical undergraduate laboratory experiment will have you measure a few quantities, calculate some combination of these and then estimate uncertainty in the calculated value. Usually, the example…
diagrammonkey.wordpress.com
November 13, 2025 at 3:49 PM
Taking the Monte Carlo out of Monte Carlo
Notes on a paper about a systematic approach for reducing the size of ensembles needed for Monte Carlo style uncertainty calculations.
diagrammonkey.wordpress.com/2025/11/13/t...
Notes on a paper about a systematic approach for reducing the size of ensembles needed for Monte Carlo style uncertainty calculations.
diagrammonkey.wordpress.com/2025/11/13/t...
Reposted by Dr. Nina Davtian (she/her/hers)
Exciting news! Student applications for paleoCAMP 2026 are open! Are you a graduate student working on any aspect of past climates or environments? Apply to be part of our 2-week summer school in the eastern Sierra Nevada! More details here: paleoclimate.camp/apply
Application — paleoCAMP
paleoclimate.camp
November 13, 2025 at 2:41 PM
Exciting news! Student applications for paleoCAMP 2026 are open! Are you a graduate student working on any aspect of past climates or environments? Apply to be part of our 2-week summer school in the eastern Sierra Nevada! More details here: paleoclimate.camp/apply
Reposted by Dr. Nina Davtian (she/her/hers)
Reposted by Dr. Nina Davtian (she/her/hers)
Reposted by Dr. Nina Davtian (she/her/hers)
Reposted by Dr. Nina Davtian (she/her/hers)
Reposted by Dr. Nina Davtian (she/her/hers)
📢Global Carbon Budget 2025📢
Fossil CO2 emissions continue to rise in 2025 while the terrestrial carbon sink recovers to pre-El Niño strength.
The key findings are covered in two reports this year:
* ESSDD (preprint): essd.copernicus.org/preprints/es...
* Nature: www.nature.com/articles/s41...
1/
Fossil CO2 emissions continue to rise in 2025 while the terrestrial carbon sink recovers to pre-El Niño strength.
The key findings are covered in two reports this year:
* ESSDD (preprint): essd.copernicus.org/preprints/es...
* Nature: www.nature.com/articles/s41...
1/
November 13, 2025 at 3:07 PM
Reposted by Dr. Nina Davtian (she/her/hers)
More figures, data, etc on the GCB website:
globalcarbonbudget.org
globalcarbonbudget.org
Home
The critical annual update revealing the latest trends in global carbon emissions
globalcarbonbudget.org
November 13, 2025 at 3:07 PM
More figures, data, etc on the GCB website:
globalcarbonbudget.org
globalcarbonbudget.org
Reposted by Dr. Nina Davtian (she/her/hers)
Keeping warming well below 2°C is still within reach, but with massive acceleration of emission mitigation.
It’s time to step, not to give up.
It’s time to step, not to give up.
November 13, 2025 at 3:07 PM
Keeping warming well below 2°C is still within reach, but with massive acceleration of emission mitigation.
It’s time to step, not to give up.
It’s time to step, not to give up.
Reposted by Dr. Nina Davtian (she/her/hers)
Here is a short thread.
First, massive thank you to all the authors of this year’s publication.
133 individuals, each one of them providing some key data.
It is really a community effort. 🙏
First, massive thank you to all the authors of this year’s publication.
133 individuals, each one of them providing some key data.
It is really a community effort. 🙏
November 13, 2025 at 3:07 PM
Here is a short thread.
First, massive thank you to all the authors of this year’s publication.
133 individuals, each one of them providing some key data.
It is really a community effort. 🙏
First, massive thank you to all the authors of this year’s publication.
133 individuals, each one of them providing some key data.
It is really a community effort. 🙏
Reposted by Dr. Nina Davtian (she/her/hers)
Also published yesterday in Nature : Emerging climate impact on carbon sinks in a consolidated carbon budget.
www.nature.com/articles/s41...
(might not be open access sorry)
www.nature.com/articles/s41...
(might not be open access sorry)
Emerging climate impact on carbon sinks in a consolidated carbon budget - Nature
Nature - Emerging climate impact on carbon sinks in a consolidated carbon budget
www.nature.com
November 13, 2025 at 3:07 PM
Also published yesterday in Nature : Emerging climate impact on carbon sinks in a consolidated carbon budget.
www.nature.com/articles/s41...
(might not be open access sorry)
www.nature.com/articles/s41...
(might not be open access sorry)
Reposted by Dr. Nina Davtian (she/her/hers)
Published today in Earth System Science Data: The Global Carbon Budget 2025
essd.copernicus.org/preprints/es...
essd.copernicus.org/preprints/es...
Global Carbon Budget 2025
Abstract. Accurate assessment of anthropogenic carbon dioxide (CO2) emissions and their redistribution among the atmosphere, ocean, and terrestrial biosphere in a changing climate is critical to bette...
essd.copernicus.org
November 13, 2025 at 3:07 PM
Published today in Earth System Science Data: The Global Carbon Budget 2025
essd.copernicus.org/preprints/es...
essd.copernicus.org/preprints/es...
Reposted by Dr. Nina Davtian (she/her/hers)
Biological accommodation of climatic variability is a first order factor enabling success of species. An excellent study of temperature niche breadth and geographical ranges of terrestrial plants.
doi.org/10.1073/pnas...
🧪 ⚒️ #EvoBio #Paleobio #Macroecology
doi.org/10.1073/pnas...
🧪 ⚒️ #EvoBio #Paleobio #Macroecology
November 13, 2025 at 2:02 PM
Biological accommodation of climatic variability is a first order factor enabling success of species. An excellent study of temperature niche breadth and geographical ranges of terrestrial plants.
doi.org/10.1073/pnas...
🧪 ⚒️ #EvoBio #Paleobio #Macroecology
doi.org/10.1073/pnas...
🧪 ⚒️ #EvoBio #Paleobio #Macroecology
Reposted by Dr. Nina Davtian (she/her/hers)
#EGU26 is already on its way 🎉!
Abstract submissions are officially open until 15 January 2026, 13:00 CET.
Let the journey begin and submit your abstract NOW!
👉 Visit https://www.egu26.eu/ for more information!
Abstract submissions are officially open until 15 January 2026, 13:00 CET.
Let the journey begin and submit your abstract NOW!
👉 Visit https://www.egu26.eu/ for more information!
November 13, 2025 at 11:30 AM
#EGU26 is already on its way 🎉!
Abstract submissions are officially open until 15 January 2026, 13:00 CET.
Let the journey begin and submit your abstract NOW!
👉 Visit https://www.egu26.eu/ for more information!
Abstract submissions are officially open until 15 January 2026, 13:00 CET.
Let the journey begin and submit your abstract NOW!
👉 Visit https://www.egu26.eu/ for more information!
Reposted by Dr. Nina Davtian (she/her/hers)
Scientific sources to check yourself:
Holocene: www.nature.com/articles/s41...
Extremes: www.nature.com/articles/s41...
Sea level: www.nature.com/articles/s43...
Tipping points: global-tipping-points.org
Holocene: www.nature.com/articles/s41...
Extremes: www.nature.com/articles/s41...
Sea level: www.nature.com/articles/s43...
Tipping points: global-tipping-points.org
Globally resolved surface temperatures since the Last Glacial Maximum - Nature
Paleoclimate datasets are integrated with a climate model to reconstruct global surface temperature since the Last Glacial Maximum, showing sustained warming until the mid-Holocene.
www.nature.com
November 13, 2025 at 12:00 PM
Scientific sources to check yourself:
Holocene: www.nature.com/articles/s41...
Extremes: www.nature.com/articles/s41...
Sea level: www.nature.com/articles/s43...
Tipping points: global-tipping-points.org
Holocene: www.nature.com/articles/s41...
Extremes: www.nature.com/articles/s41...
Sea level: www.nature.com/articles/s43...
Tipping points: global-tipping-points.org
Reposted by Dr. Nina Davtian (she/her/hers)
Never forget: At breakneck speed we are leaving the stable Holocene climate in which human society developed and thrived. Weather extremes are outside historical experience. Sea-level rise is accelerating. Dangerous tipping points are ahead.
Graph: ed-hawkins.github.io/climate-visu...
Graph: ed-hawkins.github.io/climate-visu...
November 13, 2025 at 11:52 AM
Never forget: At breakneck speed we are leaving the stable Holocene climate in which human society developed and thrived. Weather extremes are outside historical experience. Sea-level rise is accelerating. Dangerous tipping points are ahead.
Graph: ed-hawkins.github.io/climate-visu...
Graph: ed-hawkins.github.io/climate-visu...