Dr. Nina Davtian (she/her/hers)

Day 6 of #ClimateAdvent reposts.

How can we tell natural variability isn't to blame for current climate change?

2025 update: sadly @methanesat.bsky.social broke down earlier this year, but still was able to get some incredible precise methane tracking done until then and has open data access ❤️

a ~11.7-10 Ma, (b) ~10-4.8 Ma, (c) ~4.8-3.7 Ma, (d) ~3.7-2 Ma, and (e) ~2 Ma to the Holocene. Yellow star represents our study site ODP 1087, fire symbols indicate fire activities51 and large mountain symbols in (a−e) indicate high elevation of Drakensberg Escarpment54. The boldness of the black arrows indicates the strength of the trade winds, whereas the boldness of the blue arrows illustrates the strength of the Benguela Current (BC). AgC Agulhas Current, AgR Agulhas Retroflection, AgL Agulhas Leakage, BC Benguela Current, AC Angola Current, SAF Subantarctic Front.

Another nice example of the long-term "it's all connected!" of the ocean-atmosphere system. When the Benguela Upwelling System shifted gears in the late Miocene, it made southern Africa more arid. 🧪⚒️

Link: www.nature.com/articles/s43...

Non-profit societies publish impactful work and cycle fees back into the community. We need to value society journals more highly and evaluate *substance* over prestige. Indeed, shouldn't we have *higher* confidence in results published in journals *without* a profit motive ? 👀 🤔 (2/2)

The problem here isn't policy requiring open access. The problem isn't even necessarily journals charging APCs (though, that's certainly a big component). The problem is that we live in an academic environment that values journal title over substance. It's a culture problem. (1/n)

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.

426.75 parts per million (ppm) CO2 in air 04-Dec-2025
keelingcurve.ucsd.edu

Over a third of animals impacted in deep sea mining test - scientists The findings contribute to a controversial debate that pits green technology against the environment.

🌊 Deep-sea mining tests impact over a third of seabed animals - scientists

A 37% drop in deep-sea animal life from a single test. If that’s the trial run, imagine the real thing.

If we destroy ecosystems for short-term gains, what future are we even mining for?

www.bbc.co.uk/news/article...

What our missing ocean float revealed about Antartica’s melting glaciers Our ocean float spent years adrift in the Antarctic ocean and beneath massive ice shelves. What it found will help us estimate global sea-level rise.

🌊 Serendipity often drives science forward.

A “lost” Argo float drifted under Antarctica’s ice shelves and resurfaced with a warning: warm water is creeping under major glaciers like Denman and Totten.

What’s at risk? Up to 5 m of global sea-level rise.

theconversation.com/what-our-mis...

Science journal retracts study on safety of Monsanto’s Roundup: ‘serious ethical concerns’ Paper published in 2000 found glyphosate was not harmful, while internal emails later revealed company’s influence

Well this is shameful.

www.theguardian.com/us-news/2025...

This map shows the naming conventions across Europe. It's not always as simple as "first name plus last name"...

I wrote a book! A whole, real, actual book! Ada Limón, genius poet, said nice things about it! As did other absolute heroes! And now it's in libraries and bookstores in several countries! Be careful what you wish for, it might turn out awesome bookshop.org/p/books/huma...

The Indian Ocean disaster is a climate tragedy — and needs more attention A region unused to tropical cyclones has had three in a week. The world needs to ask why this happened, not look away.

Three late November tropical cyclones have devastated cities and villages in countries around the Indian Ocean.

When "a region unused to tropical cyclones has had three in a week, the world needs to ask why this happened, not look away."

Read more:

This maps shows the Pacific Ring of Fire. Source and more information: buff.ly/xSMholC

We're so good at this Science stuff. Day "5"!

Find this data, and more - in the fantastic paper by Elwyn de la Vega. Boron isotope CO2 reconstructions in the Pleistocene have come a long way... but we still have more to come. Watch this space with @mudwaterclimate.bsky.social and many others!

cp.copernicus.org/articles/19/...

CO2 back until the dinosaurs. The record is patchy, at best! We're working hard to fill all the gaps. Figure from Chalk and Rollion Bard in Elements Magazine 2025. https://www.elementsmagazine.org/boron-proxies-from-calcification-site-ph-to-cenozoic-pco2/

@erc.europa.eu #ForCry aims to take the curves like those in post two much further back in time, looking at warmer intervals to look for the tell tale signs of Earth's climate changing its vibe. Find more details below!

exocean.academicwebsite.com/projects/643...

A schematic graph showing global temperature, plotted against CO2. We know CO2 increases temperature, but the how far and how fast are still not totally constrained. Tipping points, or sensitivity changes could impact this relationship in the future, and may have done in the past.

#exoCeanadvent Day 4: Why did we set up this lab? Part I. What is going to happen to climate as CO2 levels go up? @chalkyoceans.bsky.social and @erc.europa.eu project #ForCry look at CO2 in the past to better understand climate sensitivity. Part of this is making better past CO2 reconstructions.

New @egu-cl.bsky.social paper with my @cerege.bsky.social @climatecerege.bsky.social colleague @lucbeaufort.bsky.social!
Also with @melissaberke.bsky.social in addition to @ianhall.bsky.social.
Please also check out the summary of the paper in the quoted post! 👇🏻
@egu.eu
🧪 ⚒️ 🌊 👩‍🔬
#PaleoSky

Another paper from the team, featuring the work of Melanie Guardiola, PhD student of Yannick Garcin and @guillaume-leduc.bsky.social !

The deadline has been extended through Dec 8th!

Holocene weathering proxy records (a, b) compared with hydroclimate data from the southern and northern Mediterranean borderlands (c, d), with a schematic diagram of weathering signals propagation (e). (a, b) Chemical Index of Alteration (CIA) and αAlNa profiles, color-coded by sediment provenance: Northern borderlands, Deep central basin, Libyan margin, and Nile related. Samples were selected for 6 key time slices (in conventional 14C ages): pre-S1, S1a, S1b, S1-end, post-S1, and core-top. The African Humid Period (AHP; deMenocal et al., 2000) is indicated. Data variation ranges (1 SD) are shown for both vertical and horizontal axes. (c) Mean July (summer) insolation at 25°N (Laskar et al., 2004) and hydroclimate evolutions of North Africa based on the numbers of lake sites over 10°N–28°N and 20°N–28°N, and of humid sites (i.e., lacustrine, fluviatile, palustrine) over 20°N–28°N (Lézine et al., 2011). (d) Mean January (winter) insolation at 45°N (Laskar et al., 2004) and simulated annual mean surface air temperature and precipitation on Lake Ohrid (41°N, Wagner et al., 2019), representing the northern borderlands. (e) The propagation of weathering signals is illustrated, showing lagging, mixing, and buffering processes from nearshore to deep sea. The components of total source-to-sink sediment residence time are depicted (Chen et al., 2024; Dosseto et al., 2010): soil and regolith formation (T1), catchment erosion and transport (T2 = ∼3,000 years), temporary storage in paleo-channels and floodplains (T3), and marine deposition (T4 = ∼2,000 years).

How long does it take for a climate signal to make it to the sediment at the bottom of the ocean? That is far from an easy question to answer. This team tried to match basinal weathering proxies with data from the margins and got ~3-5 Kyr. 🧪⚒️

Link: agupubs.onlinelibrary.wiley.com/doi/10.1029/...

Day 5 of #ClimateAdvent reposts

additional current "fun" facts below.

Line graph time series of 2025's daily Arctic sea ice extent compared to decadal averages from the 1980s to the 2010s. The decadal averages are shown with different colored lines with purple for the 1980s, blue for the 1990s, green for the 2000s, and white for the 2010s. Thin white lines are also shown for each year from 2000 to 2024. 2025 is shown with a thick gold line, which is currently a record low for the current date. There is a long-term decreasing trend in ice extent for every day of the year shown on this graph between October and January by looking at the decadal average line positions.

🚨 Friday ice update - #Arctic sea ice extent is currently the lowest on record (JAXA data)

• about 840,000 km² below the 2010s mean
• about 1,380,000 km² below the 2000s mean
• about 2,070,000 km² below the 1990s mean
• about 2,530,000 km² below the 1980s mean

Graphics zacklabe.com/arctic-sea-i...

Image description: Close-up of soil with text reading:' The living skin of our planet: Why a world soil health index is our next great global scorecard' Read Now.

❓Did you know that #soil is a dynamic #ecosystem that supports 95% of all the food we eat, filters every drop of our drinking water? Up to 90% of the planet’s land surface could be degraded by 2050😮.

What can be done to address this? Read our #GeoLog to learn more: egu.eu/5K6B6K

Four polar stereographic maps showing Antarctic near-surface air temperature anomalies for the month of December in 1985-1994, 1995-2004, 2005-2014, and 2015-2024. There is substantial regional variability.

And now a look at December temperatures in the #Antarctic when averaged by decade...

Data from @copernicusecmwf.bsky.social ERA5 reanalysis.

On this #WorldSoilDay, I re-up my first first-authored paper and its 🧵: 👇🏻
www.sciencedirect.com/science/arti...
While I did not opt for gold open access publication, I did pick the green open access publication path (accepted manuscript):
hal.science/hal-01683011v1
🧪 ⚒️ 👩‍🔬
Implications for #PaleoSky

Image description: Images featuring layers of soil. Text reads:' Happy International Soil Day with EGU logo'

🌱Happy International #Soil Day!

We'd like to highlight an incredible #paper in the journal SOIL by Raza et al. (2025), titled “Missing the input: the underrepresentation of plant physiology in global soil carbon research.”

🧵Read more in this #GeoLog : egu.eu/4LE7VG
📸Antonio Jordán on #imaggeo

Collapse of key Atlantic current could bring extreme drought to Europe for centuries, study finds. @swinda.bsky.social
That's an under-appreciated impact of #AMOC shutdown, of particular concern given the recent results showing much higher likelihood of this. 1/2
www.livescience.com/planet-earth...

Thermal and Non‐Thermal Controls on Benthic Foraminiferal Mg/Ca, Sr/Ca, B/Ca, and Mg/Li: Global Core‐Top Compilation, Revised Calibrations, and Application to the Geologic Record We compile ∼1,500 core-top benthic foraminiferal Mg-Sr-B-Li/Ca measurements from five species and one genus to produce new calibrations Many benthic foraminiferal elemental systems require multiv...

Absolutely delighted to announce the publication of our benthic foraminifera trace element compilation + revised multivariate calibrations: Nauter-Alves et al. (2025):
agupubs.onlinelibrary.wiley.com/doi/10.1029/...

With @willerstorfi.bsky.social @mudwaterclimate.bsky.social and others

Image description: image of a glass-domed building with people and a floating globe showing Earth. Text reads: 'Funding now available to host EGU-sponsored Geoscience Day 2026 public event!! A grant of up to €10,000 Raise awareness of the Earth, planetary and space sciences to school students, the wider public, policymakers and journalists. Apply Now By 19 January 2026.'

Want to raise #awareness of #Earth, planetary and space #sciences among school students, the general public or #policymakers?

You can NOW apply for up to €10,000 to host EGU-sponsored Geoscience Day 2026 public event!

📆 Application deadline: 19 January 2026
📄Apply here: egu.eu/2OWOH5

Stratigraphical Ludlow (late Silurian) section in the Lapgiriai-1 core.

Glad to share our new article which is dedicated to the stratigraphy and paleoenvironments (facies)of the Ludfordian (late Silurian) in relation to the largest carbon isotopic excursion of the Phanerozoic — Lau Extinction Event
1/5
www.geology.cz/bulletin/ful...
🧪 #Geology #Macroecology #Paleobio