Assessing the reliability of isoGDGTs lake-level proxies across Tibetan Plateau and Central Asian lakes Quantitative reconstruction of past lake-level changes remains challenging because robust hydrological proxies are scarce and many existing indicators…

Across Tibetan Plateau and Central Asian lakes, #TeamArchaea tetraether lipids are commonly used as lake-level proxies, but such hydrological proxies have shortcomings too, which motivates this new paper by J. Shang et al. (2026):
www.sciencedirect.com/science/arti...
#GDGTs #isoGDGTs
🧪 ⚒️
#PaleoSky

Second, I know that one day, we would know what #TeamArchaea hydroxylated tetraether lipids are capable of in the Southern Ocean—not just within the Antarctic Zone—and someone recently achieved a step toward this goal.
I will post more details on this soon!
(2/2)
#GDGTs
#isoGDGTs
🧪 ⚒️ 🌊 👩‍🔬
#PaleoSky

Here are @antarcticabella.bsky.social’s words about her new last-authored paper. 👇🏻
BTW why did I highlight the need for #TeamArchaea hydroxylated tetraether lipids to improve paleothermometry from #isoGDGTs?
First, Ishii et al. agree with this research direction!
(1/2)
#GDGTs
🧪 ⚒️ 🌊 👩‍🔬
#PaleoSky

New isoprenoid GDGT index as a water mass and temperature proxy in the Southern Ocean Abstract. The Southern Ocean plays a crucial role in the global carbon cycle, ocean heat transport, and Antarctic ice dynamics. Investigating past variability in the Southern Ocean, including temperat...

How to improve paleothermometry from #TeamArchaea tetraether lipids in the Southern Ocean? Involve hydroxylated #isoGDGTs or make the most of non-hydroxylated isoGDGTs?
Hana Ishii et al. (2026) @egu-cl.bsky.social picked the latter:
cp.copernicus.org/articles/22/...
@egu.eu
#GDGTs
🧪 ⚒️ 🌊 👩‍🔬
#PaleoSky

Hey, it’s you @terriblelagarto.pmartoza.com! 👆🏻
#GDGTs

Seasonal Changes in Marine Archaeal Tetraether Lipid Export Depth Linked to Net Primary Productivity Global marine sediment traps record seasonal changes in archeal tetraether lipid export from two depth-differentiated ecological groups Contribution of shallow-clade archaeal tetraethers increase...

This is a #TeamArchaea GDGT paper that I could not wait to see published in a journal after peer-review!
Addison Rice et al. (2026) PALO @agu.org:
doi.org/10.1029/2025...
With @appysluijs.bsky.social among the co-authors.
#GDGTs #isoGDGTs
🧪 ⚒️ 🌊 👩‍🔬
With implications for #PaleoSky

Holocene sea ice and paleoenvironment conditions in the Beaufort Sea (Canadian Arctic) reconstructed with lipid biomarkers Abstract. The Beaufort Sea region in the Canadian Arctic has undergone substantial sea ice loss in recent decades, primarily driven by anthropogenic climate warming. To place these changes within the ...

It’s #WomenInScienceDay!
Let me introduce two recent papers led by #WomenInSTEM.
First, this multi-biomarker study led by Madeleine Santos:
doi.org/10.5194/cp-2...
Featuring archaeal and bacterial tetraether lipids and last authored by @julielattaud.bsky.social.
#IDWGS
#GDGTs
🧪 ⚒️ 🌊 👩‍🔬
#PaleoSky
(1/2)

Ring Indices: The Potential Archaeal Lipid Indicator For Methane Seepage Intensity at Cold Seeps Cold seeps OH-GDGTs 1–2 derived from ANME rather than Thaumarchaeota Ring Index (RI) and RI-OH’ overcome methane index saturation, enhancing methane flux sensitivity (0.5–100×) Ring indices qual...

Ring indices of archaeal tetraether lipids—degrees of #GDGTs cyclization—are not just paleothermometers!
Here X. Xu et al. propose the dual use of such ring indices and GDGT-based Methane Index to trace methane seepage dynamics:
doi.org/10.1029/2025...
#TeamArchaea
🧪 ⚒️ 🌊
Implications for #PaleoSky

Global distribution of marine bacterial BrGDGTs in sediments: patterns and implications Branched glycerol dialkyl glycerol tetraethers (brGDGTs), originally linked to terrestrial bacteria for paleoenvironmental reconstructions, are now al…

Once again, marine tetraether lipids also include bacterial #brGDGTs!
See, for instance, this new marine brGDGT paper by @drxiaowj.bsky.social et al., just published in Geochimica et Cosmochimica Acta:
www.sciencedirect.com/science/arti...
#GDGTs #TeamBacteria
🧪 ⚒️ 🌊
With implications for #PaleoSky

chromatoPy: An Open‐Source Tool for Chromatographic Peak Deconvolution and Integration Applied to Glycerol Dialkyl Glycerol Tetraethers chromatoPy enables reproducible chromatographic peak integration using a multi-Gaussian fitting algorithm Peak areas calculated using chromatoPy are comparable to manual integration with low inte...

To all team #GDGTs members: Gerard Otiniano et al., including @islatope.bsky.social, have a new paper that describes a new open-source tool to deconvolve and integrate chromatographic GDGT peaks!
doi.org/10.1029/2025...
@agu.org
#AGUPubs
🧪
With implications for ⚒️ and #PaleoSky
(1/2)

I am so happy to co-author this #preprint review on archaeal tetraether lipids, aka #GDGTs, as marine paleoenvironmental indicators led by @lipidorama.bsky.social and @climategordon.bsky.social:
doi.org/10.22541/ess...
@cerege.bsky.social
@climatecerege.bsky.social
#TeamArchaea
🧪 ⚒️ 🌊
#PaleoSky
(1/4)

Divergent environmental controls on branched tetraethers along precipitation gradients in soils of the Tibetan Plateau Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are widely used for terrestrial paleotemperature reconstructions, yet their environmental con…

Yanwu Duan is the first author of two new papers which collectively support both #TeamBacteria and #TeamArchaea from the #GDGTs perspective.
Bacterial lipids #brGDGTs paper:
www.sciencedirect.com/science/arti...
Archaeal lipids #isoGDGTs paper:
www.sciencedirect.com/science/arti...
🧪 ⚒️
#PaleoSky

My co-authored marine GDGT « cookbook » review paper led by Peter Bijl 👨‍🔬 and @kasiasliwinska.bsky.social 👩‍🔬 is now published in @egubg.bsky.social!
doi.org/10.5194/bg-2...
Again, I am so happy to be the @cerege.bsky.social @climatecerege.bsky.social expert on #GDGTs!
@egu.eu
🧪 ⚒️ 🌊
#PaleoSky
(1/3)

GaDGeT: An open-source R-workflow for fast and flexible GDGT index calculations Understanding recent rapid environmental and climatic changes requires placing them in a long-term context derived from reconstructions from natural a…

To all team #GDGTs members: T. Schneider and @islatope.bsky.social have a new paper that describes a new software to calculate a wide range of GDGT-based indices!
www.sciencedirect.com/science/arti...
🔗 to the summary by T. Schneider in my next post.
🧪
With implications for ⚒️ and #PaleoSky
(1/2)

Boosted Regression Trees Machine Learning Method Improves the brGDGT‐Based Climate Reconstruction in Drylands Machine Learning methods reduce confounding effects and error in Branched glycerol dialkyl glycerol tetraether climate calibrations Boosted Regression Trees yields better results than Random Fore...

To all #TeamBacteria and team #brGDGTs members:
L. Dugerdil et al. (2025) PALO @agu.org have a new paper!
doi.org/10.1029/2025...
With @sebjoannin.bsky.social and @aecpaleo.bsky.social.
Also with my former PhD co-supervisor G. Ménot, who helped me to join team #GDGTs.
🧪 ⚒️ 🦣
#PaleoSky

As we* hoped, my co-authored marine GDGT « cookbook » review paper was accepted for publication in the @egu.eu journal Biogeosciences after peer-review and (minor) revision! 🥳 🍾
*Peter Bijl, @kasiasliwinska.bsky.social, and all co-authors, including myself.
#PaperAccepted #GDGTs
@egubg.bsky.social

How to use bacterial membrane lipids, named #brGDGTs, for reliable paleo-temperature reconstructions from Quaternary lake sediments?
The new paper quoted below further addresses this important question! 👇🏻
Congrats @geochemem.bsky.social and co-authors!
#GDGTs #TeamBacteria
🧪 ⚒️ 🦣 👩‍🔬
#PaleoSky

Temperature-dependent spatial and temporal trends in archaeal lipid distributions - Communications Earth & Environment Isoprenoid glycerol dialkyl glycerol tetraethers, an archaeal lipid, are linked to global carbon dioxide concentrations and temperature dependent structural properties regulate their global spatial di...

This newly published study is in favor of a (further) consideration of isoGDGT-0 and crenarchaeol in addition to isoGDGT-1 to isoGDGT-3 and crenarchaeol isomer for paleo-reconstructions.
Siqi Zhao et al. (2025) @commsearth.nature.com
doi.org/10.1038/s432...
🧪 ⚒️ 🌊 👩‍🔬
#PaleoSky
#GDGTs #TeamArchaea

Among the recent additions to my biomarker Starter Pack, I cannot not mention @paleolipidrr.bsky.social! Welcome to Bluesky Ronnie!

To all my followers: check out Ronnie’s 🧵 about his first-authored papers!
Paper #1: bsky.app/profile/pale...
Paper #2: bsky.app/profile/pale...
#GDGTs
🧪 ⚒️ 🌊
#PaleoSky

2 patterns to look for here:

1) Samples with #TEX86 should show low GDGT-2/-3 (more GDGT-3 at higher T). This is our expected #thermal pattern.

2) The opposite occurs with core-top sediments. We called this #nonthermal pattern.

We investigated #GDGTs from 7 archives!!

(5/10)

Let's start with #GDGTs & #TEX86.

#Archaea adjust the internal structures of their membrane lipids (aka #GDGT) to thrive in a wide range of temp. Marine archaea make #GDGT w/ 0-4 cyclopentyl rings. Hotter?! Let's add more rings! This is the basis of #TEX86 #SST proxy.

(3/10)

My 1st first-authored paper with incredible coauthors (Yige Zhang, Ann Pearson, Brian P. Hedlund, Shuang Zhang) was published in @pnas.org back in 2022 (doi.org/10.1073/pnas...).

We show that #GDGTs are much more than a #TEX86 temperature proxy! Curious? Here we go!

(1/10)

Nina Davtian (that's me!) at her work office, with the laptop screen showing the header of her co-authored preprint by Bijl and Sliwinksa et al. (submitted to Biogeosciences) EGUsphere (https://doi.org/10.5194/egusphere-2025-1467) with her name highlighted in the author list. Nina is holding a mug on which the text reads « 2nd international GDGT workshop September 2023, Zürich ».

Four weeks ago, my first co-authored @egu.eu preprint « Reviews and syntheses: Best practices for the application of marine #GDGTs as proxy for paleotemperatures: sampling, processing, analyses, interpretation, and archiving protocols » went online!
doi.org/10.5194/egus...
(1/4)
🧪 ⚒️ 🌊
#PaleoSky

The last paper from Devika Varma’s PhD thesis is now published in Org. Geochem.:
www.sciencedirect.com/science/arti...
Many thanks to @islatope.bsky.social for the invitation to review this paper—yes, I signed the review report.
🧪 ⚒️ 🌊 👩‍🔬
With implications for #PaleoSky
#GDGTs #isoGDGTs #TeamArchaea

Screenshot of a Google Docs page titled "References". In the document several bibliographic references are present in a numbered list. The number "300" in the last reference is highlighted, signaling that it's the 300th reference for this document.

If nothing, this manuscript will be thorough... #GDGTs 🤷🏽‍♂️

Yay! Another victory for #archaeal membrane-spanning tetraether #lipids as paleothermometers!
Zhou and Dong (2025) EPSL:
doi.org/10.1016/j.ep...
🧪
With implications for ⚒️ 🌊 and #PaleoSky
#TeamArchaea #GDGTs #iGDGTs #isoGDGTs

Investigating paleotemperature proxies based on archaeal hydroxylated tetraether lipids Understanding past sea surface temperatures (SSTs) is crucial for reconstructing Earth's climate history. Devika Varma has focused her PhD research pr…

Second, Devika Varma, who recently defended her PhD thesis. Her PhD work at @niozsearesearch.bsky.social aimed to investigate paleotemperature indicators based on archaeal hydroxylated tetraether lipids (OH-isoGDGTs):
www.nioz.nl/en/news/inve...
#GDGTs #isoGDGTs #TeamArchaea
🧪 ⚒️ 🌊
#PaleoSky
(2/4)

Utilizing Probability Estimates from Machine Learning and Pollen to Understand the Depositional Influences on Branched GDGT in Wetlands, Peatlands, and Lakes Abstract. Branched glycerol dialkyl glycerol tetraethers (brGDGTs) serve as critical molecular biomarkers for the quantitative reconstruction of past environments, ambient temperature and pH across va...

On this #InternationalWomensDay, let me highlight two 👩‍🔬.
First, @aecpaleo.bsky.social, who leads the following @egu.eu preprint:
egusphere.copernicus.org/preprints/20...
With @cindydejonge.bsky.social among other 👩‍🔬 co-authors.
#GDGTs #brGDGTs #TeamBacteria
🧪 ⚒️ 🦣
#PaleoSky
#IWD #IWD25 #IWD2025
(1/4)

I am just saying, we could have a stand like this for column chromatography #biomarkers #GDGTs

Towards quantitative reconstruction of past monsoon precipitation based on tetraether membrane lipids in Chinese loess Abstract. Variations in the oxygen isotope composition (δ18O) of cave speleothems and numerous proxy records from loess–paleosol sequences have revealed past variations in East Asian monsoon (EAM) int...

On this #InternationalDayOfWomenAndGirlsInScience, here is a great story presented in two papers led by a 👩‍🔬 (Jingjing Guo) and last authored by another 👩‍🔬 (Francien Peterse).
Paper #1: doi.org/10.5194/cp-2...
Paper #2: doi.org/10.1016/j.or...
🧪 ⚒️ 🦣 👩‍🔬
#PaleoSky
#GDGTs #brGDGTs
#IDWGS #IDWGS2025