#paleoclimate — Public Fediverse posts

Does the Sumerian King List Align with Paleoclimate Events?

https://www.vectorian.be/articles/2026-06-07/sumerian-king-list-paleoclimate-alignment-explorer/

Comments: https://news.ycombinator.com/item?id=49485532

#HackerNews #SumerianKingList #Paleoclimate #History #Archaeology #ClimateChange #AncientCivilizations

The green past of the Saharo-Arabian Desert: Isotope analyses of limestone cave deposits reveal recurrent humid intervals in the #SaharoArabianDesert over the last eight million years / International research project led by the Max Planck Institute for Chemistry with participation of #MainzUniversity and Goethe University Frankfurt, supported by the Saudi Heritage Commission and the Ministry of Culture 👉 https://press.uni-mainz.de/the-green-past-of-the-saharo-arabian-desert/

#paleoclimate #hydroclimate #geochemistry #stalagmites #speleothems

Enjoyed reading about this nice study @Palaeo3 about the relationship between Li/Ca ratios in #brachiopods and #temperature. The #dataset looks very robust and the empirical relationship highly promising for #paleoclimate #reconstructions!

https://www.sciencedirect.com/science/article/pii/S0031018225002135

#Sulphur variations in annually #layered #stalagmites using benchtop micro #XRF

#xray #fluorescence is a great tool for #geochemistry and #paleoclimate studies!

#science #spectra #traceelements

https://www.sciencedirect.com/science/article/abs/pii/S0584854722000106

SISAL v3 database and web app

Speleothem Isotopes - Synthesis and Analysis is a global working group of scientists interested in caves, stalagmites and past climate and environmental change. Thanks to the support of PAGES, this has grown into a global network of collaborators who have worked to bring together a database of all speleothem (= cave deposit) records of their oxygen and carbon isotopic composition. Oxygen isotope commonly provided a record of the rainfall that reaches the cave as drip waters.

http://andy-baker.org/2024/05/04/sisal-v3-database-and-web-app/

#science #climate #paleoclimate #caves #sql #datascience #stalagmites #SISAL

We've been working on a massive riddle tying together #self-organization, #carbonate #diagenesis, reactive transport, #paleoclimate and #Milankovich cycles, and very stiff PDE systems.

If you've missed the poster at #egu24, you can still find it attached to the abstract in the conference program (https://meetingorganizer.copernicus.org/EGU24/EGU24-16400.html) and on Zenodo https://zenodo.org/records/10943274 If you're into numerical methods, tricky PDEs or other aspects of #modeling, please see if you have any advice to us 😄 #solvers #PDE

Sometimes I get to join some interesting collaborations.

Earlier in my career, my climate research was largely on reconstructing records of past North Atlantic climate from cave stalagmites. And then I moved continents and my career changed to focus on groundwater

However, over the last year, I have got back into some of the questions related to European climate of the recent past. That is thanks to an old collaborator, Binggui Cai, who asked me to contribute to another cave stalagmite study.

In eastern Europe, replicated stalagmite records from multiple caves suggest that the strength of the North Atlantic Jet (aka 'the jet stream') in winter has strengthened over the last 140 years and is outside the range of the previous millennia.

Why eastern Europe? It is a climate 'hotspot' for understanding the strength of moisture that comes from the Atlantic. When the winter jet stream is strong, that moisture reaches the region. When it is weak, the moisture comes from the Mediterranean. Each moisture source has a different water isotope composition, and that is what the stalagmites are recording.

Having worked through all the stalagmite proxy data, the climate signal seems robust. Interestingly, it differs from recently published proxy data for the North Atlantic Jet from Greenland ice. And what climate change process has led to this change in the North Atlantic Jet?

It is a paper that raises new questions, and if it sounds interesting, the reference and link are here:

Miaofa Li et al. 2023. The strength of the winter North Atlantic jet stream has deviated from its natural trend under anthropogenic warming. Geology 2023; doi: https://doi.org/10.1130/G51329.1

#paleoclimate #climatechange #caves #stalagmites #science #environment #climate #geology #isotopes #earthscience #academia

If you are interested in paleoclimate, Quaternary environments, cave science or speleothem science, this pre-print might be of interest

The global speleothem isotope database SISAL has been updated to version 3. The oxygen and carbon isotope data included in previous versions of the database have been substantially expanded.

SISALv3, contains speleothem data from 364 sites from across the globe, including 94 Mg/Ca, 83 Sr/Ca, 51 Ba/Ca, 25 U/Ca, 29 P/Ca and 14 Sr-isotope records. The database also has increased spatiotemporal coverage for stable oxygen (831) and carbon (588) isotope records compared to SISALv2.

Want to read more? The preprint is:

SISALv3: A global speleothem stable isotope and trace element database, led by Nikita Kaushal and co-authors, and the preprint is now accessible and open for interactive public discussion until 18 Oct 2023 at: https://essd.copernicus.org/preprints/essd-2023-364/

#science #environment #paleoclimate #caves #QuaternaryScience #academia #research #isotopes #stalagmites #SISAL

Would you like to explore some cave climate and environmental archives of the world?

There is an international team - SISAL - who have compiled a global relational (SQL) database of speleothem (stalagmite and stalactite) isotope records.

And now there is a WebApp for ease of use of the database for researchers and for teachers of relational database use in earth and environmental science. And an accompanying paper.

https://geochem.hu/SISAL_webApp/

#science #earthscience #sql #academia #environmentalscience #research #caves #climate #paleoclimate #stalagmites #Geology