#lastglacialmaximum — Public Fediverse posts

The New Glacial Geomorphological Map From New Zealand [2021]
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https://blogs.egu.eu/divisions/cr/2021/04/02/new-zealand-geomorphology-glaciers/ <-- shared (2021) technical article/blog, Cryospheric Sciences (CR) Division, @European Geosciences Union
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https://doi.org/10.1080/17445647.2021.1876777 <-- shared (2020) paper
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#GIS #spatial #mapping #NewZealand #geomorphology #NewZealand #SouthernAlps #Quaternary #glaciation #landscape #hydrogeomorphology #water #ice #sediment #glacier #glacial #cryosphere #spatialanalysis #geology #Ahuriri #AhuririRiver #paleolake #WaitakiRiver #basin #remotesensing #postglacial #moraine #glaciology #cryosphere #processes #morphology #LastGlacialMaximum #geochronology

Turn back the clock to the last glacial period, and the American South was a taiga...only unlike any we know today.

Read more at my #blog: https://www.adamasnemesis.com/2026/01/21/the-glacial-american-south-a-lost-world/

This post's featured image is Southern Appalachian spruce-fir forest at Clingman's Dome by Brian Stansberry (2011) (CC-BY 3.0)

#science #climate #paleoclimatology #climatology #meteorology #weather #worldbuilding #glacial #iceage #lastglacialmaximum

What if, when we stroll into California and feel at home, we're reminded not of any paradise of today, but rather Africa in the last ice age? The science, shockingly, checks out...

Read more at my #blog: https://www.adamasnemesis.com/2025/11/18/paradise-lost/

This post's featured image is Ice Age Earth, by Ittiz of Wikipedia (rotated by me).

#iceage #climate #paleoclimate #prehistory #paleoclimatology #science #glacialperiod #lastglacialmaximum

North Devon Fremington Clay Series - A Case for Predominantly Fluvial and Periglacial Origins [pdf 22pp] #LastGlacialMaximum #Dartmoor https://www.academia.edu/144683132/Caution_in_Attributing_the_Fremington_Clay_Series_to_Irish_Sea_Glaciation_A_Case_for_Predominantly_Fluvial_and_Periglacial_Origins_in_North_Devon

#AMOC musings and global mean temperature GMT

Says here https://www.nature.com/articles/s41561-024-01568-1.epdf?sharing_token=O3cvnzvEWDHiaPGAV-CB3dRgN0jAjWel9jnR3ZoTv0M2PsD_MIel1A6mz6UbuhaTQSv4VfXkSU9okrbFGA0gy1etRpvwJw0P0tMsHg9ro8Nv1h-GiKg-3Km08jevWj3MVZ6uFzlIrUTv-X1bF8I0K8crc3qdtYsHtgUTx9fE2Zc%3D
(Original #Pontes etal 2024 https://www.nature.com/articles/s41561-024-01568-1 )

it takes 5 years for the Southern warming signal from AMOC slowdown to appear in the Atlantic near South Africa. And another 14 years for the signal to propagate from South Africa's coast to Brazil's.

So for 14 to 19 years, GMT can be expected to drop from the cooling from Greenland to St Petersburg.
(Yay, another told-you-so-moment for climate deniers!)

But then, when the warming Atlantic is seriously trapped in the South, for a while there, GMT will be stable.

Just goes to show how meaningless the concept of GMT really is. Civilisation will have disappeared in a puff of smoke, or maybe, in a blizzard. But GMT is stable. Yay.

This study looks at a few climate elements over 1000 years after fossil fuel cessation https://esd.copernicus.org/articles/15/1353/2024/esd-15-1353-2024.html
by #King et al 2024 "Exploring climate stabilisation at different global warming levels"

Among other continued regional climate changes, they find that Antarctic sea ice will continue to decline despite stabilisation of GMT🌡️ after CO2zero.

But the paper does not mention this:
continued Antarctic #seaice decline means that #Antarctic bottom water formation slows down. Which in turn changes the ocean carbon cycle and slows down AMOC.

Since they don't mention either, how trustworthy is the overall model result?
And can it also mean that a stabilised GMT is merely the result of an AMOC shutdown where cooling over North East Atlantic is balanced by warming everywhere else?

It did mean exactly that in #paleoclimate during the #LastGlacialMaximum, #LGM:
The bellwether for global mean temperature is a place called Ceara Rise off the coast of North Brazil.
It's surface temperature proxies stayed stable-ish with minuscule changes during known AMOC shutdowns in the last #IceAge
( #Westerhold et al 2020 https://www.science.org/doi/abs/10.1126/science.aba6853)

I'm not convinced that global mean temperature has meaning at all. Haven't been for a long time now. Especially because I see climate scientists on Twix, here or Bluesky mis-using GMT as proof for something to be irrelevant if it only has an impact of 0.05°C on GMT for example.

But regional impacts of something is where it hits us, our civilisation!

The chart shows temperature at Ceara Rise as white line. It's values are the originals, not in any way amended to fit the y-axis.
Greenland's d18O in light yellow is a proxy for temperature changes. When it goes up or down, it's likely that AMOC hickupped.
But Ceara Rise, the bellwether for global mean temperature, stayed a stable holiday destination for the Neanderthals throughout the Last Glacial Maximum, with changes of maybe 0.2°C .

evidence of hot spring oasis during last ice age in central Europe #HotSprings #IceAge #palaeolithic #LastGlacialMaximum
https://phys.org/news/2024-06-scientists-evidence-hot-oasis-ice.html

@Sustainable2050 @gwagner

The new CO2 reconstruction for the last 65 Million years has put me in a sharing mood:
#NASA GISS E2.1-G (IPCC6 version) simulations for this range of CO2 values.
#Miocene #Eocene #LastGlacialMaximum #MidHolocene #Climate

More evidence that humans were in North America over 20,000 years ago - Enlarge / This illustration shows what the shore of ancient Lake Otero ... - https://arstechnica.com/?p=1973451 #indigenousnorthamerica #peoplingoftheamericas #indigenousamericans #lastglacialmaximum #archaeology #footprints #whitesands #ichnology #science

Mapped - What Did The World Look Like In The Last Ice Age?
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https://www.visualcapitalist.com/cp/mapped-world-the-last-ice-age/ <-- shared article
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https://doi.org/10.1038/s41586-021-03467-6 <-- shared paper
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#GIS #spatial #mapping #model #modeling #iceage #LastGlacialMaximum #sealevel #glaciers #ice #visualisation #LGM #lasticeage #earthhistory #climate #climatechange #map #cartography #research #elevation #topography #remotesensing #opendata #global #poles #polar #pole #icemass #iceandsnow
#VisualCapitalist @visualcapitalist

Bering Land Bridge Was Established Later In The Ice Age Than Scientists Thought
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https://www.iflscience.com/bering-land-bridge-was-established-later-in-the-ice-age-than-scientists-thought-66866 <-- article
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https://doi.org/10.1073/pnas.2206742119 <-- shared paper
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H/T Thomas Holtz @Arctomet
[aside – I spent many hours as a post grad staring down a microscope at forams, so many years ago]
#GIS #spatial #mapping #spatialanalysis #formanifera #beringsea #beringstrait #landbridge #model #modeling #iceage #bathymetry #hydrography #migration #human #ancienthistory #Asia #Alaska #LastGlacialMaximum #LGM #sealevel #nitrogenisotopes #cores #spatiotemporal #icesheet

I should probably not spread preprints from another field, but this is cool. Read at your own risk; let's see what science says in a few years. But ...

From mutations in the genome, they have estimated how old moms and dads were when they had kids, which they call "generation time".

The peak generation time is just before the beginning of the #LastGlacialMaximum.This suggests a different social structure during the last glacial period.

https://www.biorxiv.org/content/10.1101/2021.09.07.459333v1

People built bone circles at the edge of ice sheets, and we don’t know why - Enlarge (credit: Alexander Pryor)
As the last Ice Age tightened its hold on Europe, a group of pe... more: https://arstechnica.com/?p=1662135 #ancientpeopledidstuff #lastglacialmaximum #russianarchaeology #ancienteurope #archaeology #pleistocene #mammoths #science #iceage