#paleoclimate — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #paleoclimate, aggregated by home.social.
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https://www.europesays.com/ie/672986/ Ancient DNA Rewrites Story of Enigmatic ‘American Cheetah’ #Acinonyx #AcinonyxJubatus #aDNA #AmericanAntelope #AmericanCheetah #Canada #cat #cheetah #climate #ClimateChange #ConvergentEvolution #diet #DNA #Éire #Evolution #Felidae #fossil #Gene #Genome #IberianLynx #IE #Ireland #lynx #LynxPardinus #Miracinonyx #MiracinonyxTrumani #NorthAmerica #paleoclimate #Pleistocene #Pronghorn #puma #PumaConcolor #Science #UnitedStates #Wyoming #yukon
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Global Estimates Of Glacier Equilibrium-Line Altitude Ratios For Enhanced Paleoclimate Reconstructions
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https://doi.org/10.1038/s43247-026-03391-5 <-- shared paper
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https://gercglacier.streamlit.app/ <-- Glacier ELA Ratio Calculator (GERC), online tool
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https://www.antarcticglaciers.org/glacier-processes/mass-balance/introduction-glacier-mass-balance/ <-- shared technical article, “An Introduction To Glacier Mass Balance”
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#geostastics #glacier #glacial #landform #cryosphere #spatialanalysis #spatiotemporal #palaeoglaciology #glaciology #global #EquilibriumLineAltitudeRatio #ELA #ratios #paleoclimate #model #modeling #numericalmodeling #classification #decisiontree #steadystate #reconstruction -
#PaperClub is back for the start of 2025, and we're kicking off with Patterson et al (2024), who present a PCP-corrected stalagmite d18O record from Vietnam, spanning 45-4 ka. Interesting paper, and the whole 'PCP impacts on d18O' thing has been getting quite a lot of airtime in recent years. Hopefully without sounding like a hater, I remain a bit skeptical. In this instance, the model assumptions include a feeding stalactite drip rate of 1 drip/second, which seems too high for LGM (where PCP effect on the stal was greatest). For stalactite PCP to be recorded in a stalagmite, there must not be sufficient residence time for re-equilibration to occur. I would love to see a sensitivity test of the drip rate on the model.
Growth rates during the 'peak PCP' period were also extremely low (<5 um/yr), which suggests to me that growth was likely not continuous over the period. d18O vals were high, I assume there was greater opportunity for disequilibrium to drive the signal rather than PCP?
Anyway, I'm definitely no expert in d18O kinetics, and I'm looking forward to hearing the opinions of the group, and anyone else who has read the paper :) I am really happy to be wrong about this, as there are lots of clever people on the paper who know more than me about this stuff!
#Paleoclimate #Speleothems #speleology
https://www.nature.com/articles/s41467-024-53422-y -
Another excellent edition of Quaternary Australasia is out! I always enjoy the post-conference student reports, especially when the students seem to have really gotten into the 'AQUA vibe'!
#AusQuaternary #QuaternaryScience #Palaeoclimate #paleoclimate
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#Peerreviewed: "We interpret this #paleoclimate as summer dry and winter wet—a climate analogous to modern day warm #Mediterranean climates in the Köppen‐
Geiger climate classification system" https://doi.org/10.1029/2024PA004874That'd be Csa. Pic: fig. 4, modern analogs 🤨
Well, thanks to #ClimateChange, they all turn Csa eventually: #OldPosts
Wladimir Köppen – a climate-vegetation genius, and what this has to do with wine
https://researchinpeace.blogspot.com/2018/02/wladimir-koppen-climate-vegetation.html -
The first paper for our paper club is this recent one from McKay et al., presenting a thorough investigation of the (supposed?) 4.2 ka event. I'd read it when it was published, but just went through again in more detail, and what a good paper. Robust stats (of course, from this group), and they do a really nice job of building the case. I hope the group enjoys it!
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Cool new cave research out today in #Nature! Weij et al. find that in southern Australia glacial periods tend to be moist, contrary to the currently held view that glacial periods are cool and dry in the subtropics.
Neat work from Rieneke and a bunch of Aussie quaternarists!
https://www.nature.com/articles/s41586-023-06989-3
#palaeoclimate #paleoclimate #LGM #glacial #Australia #AusQuaternary
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Destructive analyses make me sooooo nervous, but I am looking forward to finding out how old these samples are! Hopefully the results will be worth the anxiety 😅
#geochronolgy #UTh #stalagmite #palaeoclimate #paleoclimate #dontfuckitup
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I bloody LOVE to see friends kicking goals! New paper out today from the brilliant Georgy Falster at #ANU "Forced changes in the Pacific Walker circulation over the past millennium"
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If you are suffering some #INQUAROMA2023 FOMO, the good news is the plenaries are being live-streamed. Very enjoyable presentation from Prof. Hai Cheng on speleothem chronologies and quaternary climate change.
https://www.youtube.com/watch?v=WQVVuTFTivE -
"The δ7Li records from the Nanyang Basin reveal that silicate chemical weathering responded abruptly to carbon release and associated hydroclimate change during the PETM. Enhanced silicate weathering not only directly sequestered CO2 but also stimulated organic carbon burial, promoting climatic recovery."
For our context: over the course of somewhere in the neighorhood of 50-100Ky? Not in the nature of a quick fix.
#Paleoclimate
#PaleoceneEoceneThermalMaximumhttps://agupubs.onlinelibrary.wiley.com/doi/10.1029/2023GL102897?af=R
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If anyone is looking for papers to catch up with for their #NewYearResolution - I post about new Earth Science papers every Friday over on Twitter (https://twitter.com/BialikOr) with the hashtag #WeekendReading if you're looking for some recommendations. Ranges from #geochemistry and #paleoclimate to #oceanography and #EarthSystems.
(I should really start posting them also on Mastodon - check this space on Friday to see if I remembered)