Dr. Nina Davtian (she/her/hers)
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ninadavtian.bsky.social
Dr. Nina Davtian (she/her/hers)
@ninadavtian.bsky.social
4K followers 2.2K following 560 posts
@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
🇫🇷 -> 🇪🇸 -> 🇫🇷
Posts Replies Media Videos
ninadavtian.bsky.social
We're snailposting, post your snails!
Snail on an anthropized soil with a crack. The snail is a few cm long and its shell shows black and yellowish tones.
November 9, 2025 at 6:07 PM
ninadavtian.bsky.social
Tagging again the other co-authors on Bluesky:
@antarcticabella.bsky.social
@arnaudhuguet.bsky.social
@paleolipidrr.bsky.social
@alexauderset.bsky.social
@melissaberke.bsky.social
@lipidorama.bsky.social
@pierrickfenies.bsky.social
@climategordon.bsky.social
@organiccarbon.bsky.social
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Header and abstract of the review article by Bijl and Śliwińska et al. (2025) Biogeosciences (https://doi.org/10.5194/bg-22-6465-2025) entitled "Reviews and syntheses: Best practices for the application of marine GDGTs as proxy for paleotemperatures: sampling, processing, analyses, interpretation, and archiving protocols". Screenshot taken by Nina Davtian (that's me!).
November 6, 2025 at 9:26 PM
ninadavtian.bsky.social
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
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Nina Davtian (that's me!) at her work office, with the laptop screen showing the header of her co-authored review article by Bijl and Śliwińska et al. (2025) Biogeosciences (https://doi.org/10.5194/bg-22-6465-2025), 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 ».
November 6, 2025 at 9:26 PM
ninadavtian.bsky.social
If you see this, quote post a sunset.

Calvi, Corsica.
Sun setting behind the Revellata peninsula, Corsica. The buildings are part of the town of Calvi. The sun is orange and lights high-level clouds. Photo taken by Nina Davtian (it’s me!) from the Genoese citadel of Calvi.
October 14, 2025 at 5:57 AM
ninadavtian.bsky.social
Congrats #Kyanite!
On top of this, I wore a piece of the #MinCup25 champion today!
A silver ring with a kyanite stone on a right finger index. Photo taken on 2nd October 2025 by Nina Davtian (it’s me!).
October 2, 2025 at 5:25 PM
ninadavtian.bsky.social
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
Title and author list of the online preprint by Bijl and Sliwinksa et al. (submitted to Biogeosciences) EGUsphere (https://doi.org/10.5194/egusphere-2025-1467) entitled "Reviews and syntheses: Best practices for the application of marine GDGTs as proxy for paleotemperatures: sampling, processing, analyses, interpretation, and archiving protocols", with a note which reads "Revised manuscript accepted for BG"—"BG" stands for "Biogeosciences"—and the co-editor-in-chief’s comment which reads "This publication provides a comprehensive review of the use of GDGTs (Glycerol Dialkyl Glycerol Tetraethers) for reconstructing past temperatures, with a particular focus on marine applications. It covers the full research workflow — from sample collection and processing to analytical methodologies, data interpretation, and data archiving. Importantly, the authors highlight best practices and propose recommendations to standardize approaches across the field. This review therefore serves as a valuable reference for both the paleoclimatology and organic geochemistry communities.". Screenshot taken on 26 September 2025 by Nina Davtian (that's me!) from the following website: https://bg.copernicus.org/preprints/preprints.html
September 26, 2025 at 9:36 PM
ninadavtian.bsky.social
Good news: my first first-authored paper just had a new citation!
Not-so-good news: the citing paper is published in a MDPI journal and, most importantly, the citation of Davtian et al. (2016)—see its overview in the quoted 🧵 below—appears irrelevant to me.
#AcademicChatter
bsky.app/profile/nina...
Screenshot of the PDF header of the paper by Qin et al. (2025) Agronomy (https://doi.org/10.3390/agronomy15081763). The screenshot also shows the logo of the journal publisher, MDPI. Screenshot taken by Nina Davtian (it’s me!). Screenshot of a textual extract from the paper by Qin et al. (2025) Agronomy (https://doi.org/10.3390/agronomy15081763). The screenshot highlights a section in which Davtian et al. (2016) Organic Geochemistry (https://doi.org/10.1016/j.orggeochem.2016.09.002) is cited—it is ref. 23. Screenshot taken by Nina Davtian (it’s me!). Screenshot of another textual extract from the paper by Qin et al. (2025) Agronomy (https://doi.org/10.3390/agronomy15081763). The screenshot shows that Qin et al. truly cited Davtian et al. (2016) Organic Geochemistry (https://doi.org/10.1016/j.orggeochem.2016.09.002) as ref. 23. Screenshot taken by Nina Davtian (it’s me!).
July 25, 2025 at 9:26 PM
ninadavtian.bsky.social
It’s time for me to show the stripes in my home city and home country!
The link to get the stripes is in the quoted post below. 👇🏻
#ShowYourStripes
Marseille (France) stripes. Source: https://showyourstripes.info France stripes. Source: https://showyourstripes.info
June 21, 2025 at 5:48 PM
ninadavtian.bsky.social
… and second, the @laboratoire-epoc.bsky.social core repository in early June—two weeks ago.
Hopefully, these core repository visits would be the first of many!
🧪 ⚒️ 👩‍🔬
#PaleoSky
@cerege.bsky.social
@climatecerege.bsky.social
(2/2)
One of the corridors of the EPOC (Environnements et Paléoenvironnements Océaniques et Continentaux UMR 5805) core repository. Photo taken by Nina Davtian (it’s me!). One of the marine sediment cores—sorry, no spoiler for you today!—sampled at the EPOC (Environnements et Paléoenvironnements Océaniques et Continentaux UMR 5805) core repository—the holes show the positions of the newly picked sediment samples before plugging. Photo taken by Nina Davtian (it’s me!).
June 16, 2025 at 9:15 PM
ninadavtian.bsky.social
Over the past few months, I went to two core repositories to sample several marine sediment cores and meet some of my new collaborators in person.
First, the @lsce-ipsl.bsky.social core repository in mid-April…
🧪 ⚒️ 👩‍🔬
#PaleoSky
@cerege.bsky.social
@climatecerege.bsky.social
(1/2)
One of the corridors of the LSCE (Laboratoire des Sciences du Climat et de l’Environnement UMR 8212) core repository. Photo taken by Nina Davtian (it’s me!). One of the marine sediment cores—sorry, no spoiler for you today!—sampled at the LSCE (Laboratoire des Sciences du Climat et de l’Environnement UMR 8212) core repository. Photo taken by Nina Davtian (it’s me!).
June 16, 2025 at 9:15 PM
ninadavtian.bsky.social
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...
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🧪 ⚒️ 🌊
#PaleoSky
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 ».
May 13, 2025 at 10:00 PM
ninadavtian.bsky.social
If you see this, post a photo from your device with no explanation.
North African food (couscous and tajine dishes).
February 13, 2025 at 8:09 AM
ninadavtian.bsky.social
Three years ago, I celebrated the third #anniversary of my #PhD defense at the formerly 🐦 place.
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Screenshot of Nina Davtian’s (it’s me!) post in English about the third anniversary of her PhD defense on 8 February 2022 at the formerly bird place. Nina Davtian’s post quoted the account of the CEREGE Climate group—now dormant at the formerly bird place—concerning Nina Davtian’s PhD defense. Screenshot taken by Nina Davtian (it’s me again!).
February 8, 2025 at 6:26 PM
ninadavtian.bsky.social
Today, my #PhD degree, which I completed at @univ-amu.fr @cerege.bsky.social, turns six!
Thank you again @tdegaridel.bsky.social—co-director of @climatecerege.bsky.social at that time—for the first post about my PhD defense at the formerly 🐦 place!
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#Anniversary
Screenshot of Thibault de Garidel’s post in French about Nina Davtian’s (it’s me!) PhD defense on 8 February 2019 at the formerly bird place. Screenshot taken by Nina Davtian (it’s me again!).
February 8, 2025 at 6:26 PM
ninadavtian.bsky.social
Si vous voyez ce message, postez un lever ou un coucher de soleil à partir de votre galerie de photos

Quelque part dans les environs de Calvi, 2023
Coucher de soleil pris quelque part dans les environs de Calvi en 2023
January 31, 2025 at 9:27 AM
ninadavtian.bsky.social
Many thanks for the prompt reply!
I did not receive a notification concerning my addition to this list either. Was this list withheld as well for the same reasons (I suspect so)?
Another possibly spammy list to which I was recently added. Screenshot taken by Nina Davtian (it’s me) on 19 January 2025.
January 19, 2025 at 7:51 AM
ninadavtian.bsky.social
Is it normal that I was not notified concerning my addition to these lists*?

*I also suspect an abusive (and malicious?) use concerning handle.invalid’s list, but this is another story.
Two lists to which I was added without any notification from Listifications. Screenshot taken on 18 January 2025 by Nina Davtian (it’s me).
January 18, 2025 at 9:55 AM
ninadavtian.bsky.social
If you see this, post something green...
Edamame—boiled green soybeans in their pods—in a bowl and accompanied with a mango-flavored soda. A pair of black chopsticks is visible between the bowl and soda.
January 1, 2025 at 11:07 AM
ninadavtian.bsky.social
To all my followers: you may have noticed that I repost more often than I post. If you prefer to see only original posts, remember that @bsky.app’s settings allow you to achieve this as follows. 👇🏻
Screenshot of Bluesky’s settings, which highlights « Content and media ». Screenshot and highlight by Nina Davtian (it’s me!). Screenshot of Bluesky’s « Content and media » settings, which highlights « Following feed preferences ». Screenshot and highlight by Nina Davtian (it’s me!). Screenshot of Bluesky’s « Content and media > Following feed preferences » settings, which highlights « Show reposts » that is switched off. Screenshot and highlight by Nina Davtian (it’s me!).
December 21, 2024 at 10:14 AM
ninadavtian.bsky.social
I am so glad to be part of the @climatecerege.bsky.social research team again! And this time, I would remain part of this research team for a while! Also, @juliemeilland.bsky.social will become one of my @climatecerege.bsky.social colleagues next year!
Photo of a slide listing the staff arrivals to CEREGE (Aix-en-Provence, France) and staff departures from this research laboratory. The slide was presented during the CEREGE’s General Assembly on 16 December 2024. The slide shows, among other pieces of news, Clara Maurel’s, Nina Davtian’s (it’s me!), and Julie Meilland’s recruitments as new CR CNRS researchers at CEREGE. The photo also shows the speaker on the left, Lucilla Benedetti, the director of CEREGE. Photo taken by Nina Davtian (it’s me again!). Photo of a slide showing the permanent staff arrivals to the Climate Team at CEREGE (Aix-en-Provence, France). The slide was presented during the CEREGE’s General Assembly on 16 December 2024. The slide shows the headshots and position names of Elodie Brisset, Nina Davtian (it’s me!), David Au Yang, and Julie Meilland (to arrive at CEREGE in early 2025). The photo also shows the speaker on the left, Alexis Licht, the director of the Climate Team at CEREGE. Photo taken by Nina Davtian (it’s me again!).
December 19, 2024 at 3:52 PM
ninadavtian.bsky.social
Among my six first-authored papers, the highest @altmetric.com number currently belongs to Davtian and Bard (2023) PNAS, which is not a surprise given the paper’s significance. Importantly, this is a case of modest but good « buzz » to me so far.
(4/4)
#AcademicChatter
Screenshot taken on 16 December 2024 by Nina Davtian (it’s me!). On 16 December 2024 at 9 AM CET—time of screenshot—Davtian and Bard (2023) Proceedings of the National Academy of Sciences of the United States of America had an Altmetric number of 24.
December 16, 2024 at 10:52 AM
ninadavtian.bsky.social
BTW among my twelve papers—first-authored and co-authored papers—Martin et al. (2020) QSR currently has the second highest @altmetric.com number, whereas the highest @altmetric.com number currently belongs to Ochando et al. (2024) QSR.
(2/4)
#AcademicChatter
Screenshot taken on 16 December 2024 by Nina Davtian (it’s me!). On 16 December 2024 at 9 AM CET—time of screenshot—Ochando et al. (2024) Quaternary Science Reviews had an Altmetric number of 421.
December 16, 2024 at 10:52 AM
ninadavtian.bsky.social
Interesting…
I checked out the @altmetric.com captures of the reintroduced @climatecerege.bsky.social papers of mine and realized that @altmetric.com also captured DOI links in ALT texts of figures, even in the absence of such a link in the associated Bluesky post.
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#AcademicChatter
Screenshot taken on 16 December 2024 by Nina Davtian (it’s me!). The screenshot shows that the paper by Martin et al. (2020) Quaternary Science Reviews was picked by Altmetric not only when Nina Davtian (it’s me again!) posted the DOI link in her Bluesky post, but also in another Bluesky post of hers with a DOI link in the ALT text of a posted figure but not the Bluesky post itself. On 16 December 2024 at 9 AM CET—time of screenshot—Martin et al. (2020) Quaternary Science Reviews had an Altmetric number of 318.
December 16, 2024 at 10:52 AM
ninadavtian.bsky.social
In short, Martin et al. (2020) found:
1) A thermal maximum recorded by brGDGTs and pollen during the early Holocene
2) Rapid climate events recorded by brGDGTs and pollen during the Holocene
3) No evidence for a seasonal bias in the brGDGT or pollen temperature signals
NB: Two-part ALT text.
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First part of ALT text for Fig. 7 in Martin et al. (2020) QSR (https://doi.org/10.1016/j.quascirev.2019.106109). Holocene climatic variations in the northern hemisphere and a focus on Western Europe. A. July insolation at 45°N (Laskar et al., 2004 https://doi.org/10.1051/0004-6361:20041335). B. Stacked temperature anomaly (from the AD 1961–1990 mean) for middle and high latitudes of the northern hemisphere obtained from a compilation of proxy-based temperature reconstructions with 1σ uncertainty (shading) from Marcott et al. (2013 https://doi.org/10.1126/science.1228026). C. Mean annual temperature reconstruction for North America and Europe based on fossil pollen data with 2.5 and 97.5% uncertainty bands (shading) from Marsicek et al. (2018 https://doi.org/10.1038/nature25464). D. Temperature anomaly for the northern hemisphere obtained from a compilation of proxy-based temperature reconstructions from land areas and its 200-year Butterworth low-pass filtered values (brown line) from Pei et al. (2017 https://doi.org/10.1007/s00704-016-1932-5). E. Reconstructed temperature from argon and nitrogen isotopes for Greenland with 2σ error bands from Kobashi et al. (2017 https://doi.org/10.1038/s41598-017-01451-7). F. Sea surface temperature provided by relative proportion of the di- and tri-alkenones of 37 carbons from ODP Site 161-976 and sediment core MD95-2043 (Cacho et al., 1999 https://doi.org/10.1029/1999PA900044; Martrat et al., 2014 https://doi.org/10.1016/j.quascirev.2014.06.016). G. Spliced and stacked chironomid-based reconstruction for the northern and central Alpine area at 1000 m from Heiri et al. (2015 https://doi.org/10.1177/0959683614556382) with standard error estimates (shading). H. Mean annual air temperature obtained from fluid inclusions in speleothems from Milandre Cave in Switzerland (Affolter et al., 2019 https://doi.org/10.1126/sciadv.aav3809) with uncertainty (shading). Second part of ALT text for Fig. 7 in Martin et al. (2020) QSR (https://doi.org/10.1016/j.quascirev.2019.106109). I. Mean annual temperature reconstructed from pollen of Lake St Front with Weighted Averaging Partial Least Squares (WAPLS, black curve) and Modern Analog Technique (MAT, green curve) methods with its uncertainty (grey dashed lines and green shading, respectively). J. Corrected mean annual air temperature (MAAT) obtained from the binary mixing model with the Sun et al. (2011 https://doi.org/10.1029/2010JG001365) calibration for Lake St Front (red continuous line) with the error associated to the propagation of end-member variability (red shading) and its running average on 5 points (black dashed line) compared with the mean Holocene temperature (black dotted line). K. Difference between the mean annual temperatures obtained from brGDGTs and pollen with the MAT method, the black dashed line indicates equality between both results. L. 14C calibrated ages and 210Pb dates for Lake St Front for the Holocene (Martin et al., 2019 https://doi.org/10.1016/j.orggeochem.2019.06.005). M. Advances (blue rectangles) and recessions (orange rectangles) of Alps glaciers (Holzhauser et al., 2005 https://doi.org/10.1191/0959683605hl853ra; Joerin et al., 2006 https://doi.org/10.1191/0959683606hl964rp; Nicolussi and Patzelt, 2000 https://www.researchgate.net/publication/309456923_Untersuchungen_zur_holozanen_Gletscherentwicklung_von_Pasterze_und_Gepatschferner_Ostalpen; Solomina et al., 2015 https://doi.org/10.1016/j.quascirev.2014.11.018). Blue shaded rectangles correspond to cold events. The period of permanent human occupation is marked by a hatched rectangle. The dotted rectangle shows the period with high Corylus percentages. MHC=Mid-Holocene Cooling, MHO=Mid-Holocene Optimum, RCC=Rapid Climate Change, IACE = Iron Age Cold Epoch, RWP=Roman Warm Period, RWPC=Roman Warm Period Cooling, DA=Dark Ages, MCA=Medieval Climate Anomaly.
December 15, 2024 at 8:05 PM
ninadavtian.bsky.social
In short, Ménot et al. (2020) found:
1) A stepwise onset of the African Humid Period (AHP) at 14.8 ka
2) An early initiation of the AHP stepwise termination at 8.5 ka ending within 4 ka
3) An imprint of abrupt “North Atlantic events” such as the Younger Dryas in the Nile sedimentary sequence
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Fig. 4 in Ménot et al. (2020) QSR (https://doi.org/10.1016/j.quascirev.2019.106071). Regional significance of the Nile deep-sea fan sedimentary records at the scale of the Eastern Mediterranean basin. A. Summer 15°N Insolation (Berger, 1981 https://doi.org/10.1007/978-94-009-8514-8_29) and relative sea level (Rohling et al., 2009 https://doi.org/10.1038/ngeo557) curves. Comparison of the BIT-index curves available on a west-east local transect: B. MS27PT (this study), C. P362/2-33 (Blanchet et al., 2015 https://doi.org/10.1016/j.quascirev.2015.07.014) and D. GeoB7702-3 (Castaneda et al., 2010 https://doi.org/10.1029/2009PA001740). Similar comparison for the few εNd records: E. MS27PT (this study) and F. P362/2-33 (Blanchet et al., 2014 https://doi.org/10.1371/journal.pone.0115958). Fig. 5 in Ménot et al. (2020) QSR (https://doi.org/10.1016/j.quascirev.2019.106071). Hydrological changes in Africa through the last 20 ka. A. ΣIIIa/ΣIIa (reversed axis) and BIT-index from core MS27PT. East African precipitation records: B. δDwax from Lake Tana (reversed axis, Costa et al., 2014 https://doi.org/10.1016/j.quascirev.2013.10.031) and insolation curve (Berger, 1981 https://doi.org/10.1007/978-94-009-8514-8_29) and C. δDwax from Lake Tanganyika (reversed axis, Tierney et al., 2008 https://doi.org/10.1126/science.1160485). West Africa precipitation records: D. Lake-level history of Lake Chad (Armitage et al., 2015 https://doi.org/10.1073/pnas.1417655112). Closed and open symbols are for Lake Chad and the Bodélé Basin, respectively. E. δDwax from Lake Bosumtwi (Shanahan et al., 2015 https://doi.org/10.1038/ngeo2329) and from Lake Barombi Mbo (open symbols, Garcin et al., 2018 https://doi.org/10.1073/pnas.1715336115) (reversed axis in both cases) and F. δDwax from the Congo deep-sea fan, GeoB 6518-1 (reversed axis, Schefuβ et al., 2005 https://doi.org/10.1038/nature03945). Shaded green area underlines the African Humid Period in its historical definition (5–11 ka, Gasse, 2000 https://doi.org/10.1016/S0277-3791(99)00061-X) and grey areas underline North Hemisphere climatic events, H1 and YD stand for Heinrich Event 1 and Younger Dryas, respectively.
December 15, 2024 at 8:05 PM