Lmst

#IceCore

Sustained Decrease In Inland East Antarctic Surface Mass Balance Between 2005 And 2020
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https://doi.org/10.1038/s41561-025-01699-z <-- shared paper
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#GIS #spatial #mapping #Antarctic #EastAntarctic #icesheet #massbalance #spatialanalysis #model #modeling #spatiotemporal #water #climate #climatedynamics #monitoring #remotesensing #earthobservation #icecore #snowpit #wind #melting #water #ice #science #cryology #snow #weather #watervapour #climatemodel

Volcanic Eruptions Linked To Neolithic 'Sun Stone' Sacrifices In Denmark
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https://phys.org/news/2025-01-volcanic-eruptions-linked-neolithic-sun.html <-- shared technical article
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https://dx.doi.org/10.15184/aqy.2024.217 <-- shared paper
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#archaeology #excavation #neolithic #sunstone #denmark #island #Bornholm #sacrificed #sun #field #agriculture #volcanic #eruption #model #modeling #humanimpacts #weather #climate #volcaniceruption #ash #sulfur #atmosphere #stratosphere #farming #agriculture #crop #cropyields #failed #harvest #foodsecurity #famine #disease #prehistory #icecore #reconstruction #Vasagård #Vasagard #ritual #spiritual #reconstruction #spatiotemporal

cross sections - Section of ditch XIV of the causewayed enclosure at Vasagård West

photos - Plaques with sun motifs. A) VAS 1708: 57 × 53mm; B) VAS 437: 47 × 43mm

map, photos and drawings - The circular structure in trench XXIV at Vasagård West and the objects found in the postholes: engraved stones (1, 2 & 5), pottery (3 & 4) and decorated burnt daub (6 & 7)

In an ocean of bad news, here's some science excitement - the beyond EPICA team has announced they've drilled an ice core dating continuosly to 1.2 million years ago!! This core will give key information about the transition to the 100-000 year earth - the cycle of glacials and interglacials in which we currently live. So cool (pun intended).

#Antarctica #paleoclimate #IceIceBaby #IceCore #ClimateScience

https://www.awi.de/ueber-uns/service/presse/presse-detailansicht/mehr-als-12-millionen-jahre-altes-eis-erbohrt.html

‘Mystery Volcano’ That Erupted And Cooled Earth In 1831 Has Finally Been Identified
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https://www.accuweather.com/en/weather-news/mystery-volcano-that-erupted-and-cooled-earth-in-1831-has-finally-been-identified/1729581 <--shared technical article
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https://doi.org/10.1073/pnas.2416699122 <--shared paper
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#GIS #spatial #mapping #glaciochemical #geochemistry #climate #climatechange #sulfurdioxide #neversummer #temperature #weather #icecore #LittleIceAge #dating #model #modeling #spatialanalysis #historic #volcanic #eruption #stratigraphy #Zavaritskii #caldera #ash #KurilIslands #Japan #Kamchatka #Russia #volcano #stratospheric #cryptotephra #tephra #andesite #dacite #Simushir #SimushirIsland

oblique view - volcanic caldera, aerial image, Simushir Island, Kuril Islands, Pacific Ocean

maps and cross section - Location map of Zavaritskii caldera, Simushir Island, Kurils.

maps and charts - Glaciochemical records from Greenland ice-cores (NEEM-2011-S1 (A), NGRIP1 (B), B19 (C), and Tunu2013 (D)). Sulfur (S) and non-sea-salt sulfur (nssS) are shown on the left-hand axis (blue line; in ng/g).

aerial view - volcanic caldera, aerial image, Simushir Island, Kuril Islands, Pacific Ocean

Jesse Harlin has their first DriveThuRPG credit with an #icecore TTRPG. The quickstart is out now and free to download while the core Arrhenius rules are expected in 2025. https://www.geeknative.com/170240/free-to-download-arrhenius-quickstart-guide/?utm_source=mastodon&utm_medium=social&utm_campaign=fedica-GNBlogWave1

Some ice cores contain air bubbles trapped from hundreds of thousands of years ago, preserving tiny samples of the ancient atmosphere. This allows scientists to directly measure past concentrations of greenhouse gases like carbon dioxide and methane.

#science #sciencefacts #icecore #ancientatmosphere

Waiting for the handyman.
Reading a paper on analyzing firn in Antarctica. Firn is the snow layer before it gets compacted to actual ice. The firn layer contains gas like methane or CO2, too, but the air bubbles aren't strictly sorted on input date 😁 The bubbles can be older or younger than their immediate surrounding. (True for real ice layers, too.)

All very interesting.
https://tc.copernicus.org/articles/13/3383/2019/tc-13-3383-2019.html
"Multi-tracer study of gas trapping in an East Antarctic ice core" by Kevin #Fourteau et al 2019.

The absolute shocking byproduct of their incredibly thorough work is a 2700 year data series for CH4 in MONTHLY resolution!! https://doi.pangaea.de/10.1594/PANGAEA.909627?format=html#download

From -930 to 1774 AD.
Their gas dating method is so exact that they pinpoint several different days for every month, too.

I am stunned that monthly resolution is possible. And this was merely a byproduct of figuring out the best way to analyze firn.

#paleoclimate #methane #CH4 #firn #icecore #ice #snow #Antarctica

My ace colleague from Copenhagen University, and PI on #PRECISE Christine Hvidberg presenting some new insights from GPS at the #IceCore sites on #GreenlandIceSheet dynamics at #IGSnorthumbria2024

🥶 Who needs a natural, super cold freezer at -54C/-65°F?

Ice core scientists like INSTAARite Tyler Jones! They are working to preserve #IceCore records for the future. One option is a remote cave in Antarctica being used as an ice sanctuary 🧊 https://grist.org/looking-forward/meet-the-scientists-behind-the-ice-sanctuary-a-memory-vault-for-dying-glaciers/

🥵 Feeling the summer heat? Visit the world's largest archive of ancient ice 🧊 & drill into #IceCore science via H2O Radio's 6-minute audio story about the NSF Ice Core Facility. INSTAARite (& stable isotope guru) Bruce Vaughn is a featured guest.

🔊Listen at https://h2oradio.org/this-week-in-water/frozen-assetsthe-race-against-time-to-protect-priceless-artifacts

A science technician measures a section of the WAIS Divide ice core as it begins its journey down a core processing line. Scientists and technicians will cut the ice so it can be sent to labs around the country for analysis. Credit: Peter Rejcek, NSF

<grumble> why can't I find a high resolution record for #CO2 or CH4 from Greenland #icecore ? I mean, really... ~200 year resolution in the #Holocene is just not good enough. And output from a model (Kleinen) is not what I want. I want a Koehler-2017-equivalent for #Greenland ! #Followerpower

Art and science intersect: "Little pieces of Antarctica were melting: cross-sections of an ice core...Artist Porras-Kim found another kind of collection, at the Ice Core Facility, where about 25,000 meters of ice are neatly stashed in metal tubes within a giant freezer kept at -38 C. About 2,000 meters a year are deaccessioned to make room for new samples; this is how Porras-Kim was able to obtain the cores for her exhibition." https://www.nytimes.com/2024/04/05/arts/design/gala-porras-kim-denver.html?ugrp=m&unlocked_article_code=1.iE0.anoK.bJYOABOBZBCE&smid=url-share #art #science #climate #icecore #museum

Just remembered having read a paper this year where a team had drilled an #IceCore in the West of #Greenland and at the bottom of the core, where the drill had literally hit rock bottom, they ... found a plant leaf.
Indicating that West Greenland was not only ice free but ice free for long enough so soil for plant growth had existed.
The plant grew 400 thousand years ago in #MIS11 and the climate was 1.2C over pre industrial.

When I remembered, this paper just now, a plot occurred to me for a future novel on paleo climate scientists who look at West Greenland again. Like, maybe 400 thousand years into the future, when there will have been 3 more glacials with Greenland fully covered in ice. What will they find when their drill hits rock bottom?

We should place a #Tesla at the site where they found that plant leaf this year. Just put it on top of the still existing ice. It's heavy enough so it'll just sink lower and lower and also stay put once all ice has washed to the sea...

Does #Europe know just how awesome the #BeyondEPICA project is?
Drilling an *ancient* #iceCore in a very remote and very cold part of #Antarctica...
Good overview talk here at #ESSI

Slide describing the European project "Beyond EPICA"

@DrEvanGowan posted a cool chart of 800 thousand years #PaleoClimate history https://fediscience.org/@DrEvanGowan/111375198866000253
His chart prompted me to update my girlie-coloured sheet with Rohling's #SeaLevel and Bereiter's CO2 from #IceCore . I usually plot Yamamoto's #CO2 from #LeafWax in the Gulf of Bengal because the time series is a few million years long, at lower resolution.
Picture 1 shows me how our Holocene compares with two contenders for the best-analogue-award, called MIS 11 (top) and MIS 5 (middle). The plots are centred on the deglaciation-trigger, the golden Precession cycle favouring the Northern Hemisphere. The lines are blue sea level, brown CO2, gold #SST in the #Atlantic between Ireland and Greenland, red SST South of Africa.
Picture 2 shows 800ky years of the same and tells me the broader context. I guess, the Holocene would have followed MIS 5 – a bit longer because the current precession cycle favouring Southern summer is still within the Tilt cycle. (also see ALT)

3 charts of what is described in the toot, MIS 11, MIS 5 and Holocene.
What stands out is that MIS11 occurred during low eccentricity and low precession. And that it lasted very, very long, 40 thousand years from the onset at 430 thousand years ago. All the while, North Atlantic and South Atlantic hardly drop at all.
MIS 5 began at a rather high eccentricity level which was still rising. The onset was 134 thousand years ago and after 20 thousand years, both Atlantic SSTs drop significantly, in sync with sea level and of course CO2.
The Holocene began with an eccentricity as low as MIS11 and with obliquity/tilt cycle in between the one of MIS11 and MIS5.
Onset was 16 thousand years ago. And SST in the South Atlantic shows the beginning of a drop similar to the drop in MIS5 on the time scale, at about year AD 1700. So I guess, the Holocene would have followed the evolution of MIS 5 – a little longer, tho, because the current precession cycle favouring Southern summer is still within the Tilt cycle.

And then came anthropogenic climate forcing, of course.

800 thousand years as described in the toot. The most remarkable detail is maybe that glaciation is a very gradual process, taking 70 thousand years or so, while deglaciation happens in the blink of an eye, ie within 8 thousand years or so.
Also the eccentricity cycle is better discernible than on the 3 excerpt charts. MIS 11 and our Holocene are the only ones (in this chart) that occurred during the lowest eccentricity.

Ice Core From Secret Cold War Army Mission Reveals Greenland Melted Recently
A large portion of Greenland was an ice-free tundra landscape—perhaps covered by trees and roaming woolly mammoths—in the recent geologic past (about 416,000 years ago), a new study in the journal Science shows.
https://scitechdaily.com/ice-core-from-secret-cold-war-army-mission-reveals-greenland-melted-recently/ #greenland #IceCore #melting #warming

The #USArmy planned to hide #nuclearweapons in ice tunnels in north-west #Greenland in the 1960s.

An #icecore taken during the operation was rediscovered in 2018.

Analysis of the core shows north-west Greenland was ice free during Marine #isotope Stage 11 (#MIS11 ), which occurred between 426,000 and 396,000 years ago, when #temperatures were similar to today.

#climate #paleoclimate #icesheet #glaciology

https://www.abc.net.au/news/science/2023-07-21/greenland-ice-core-secret-us-army-base-reveals-dramatic-melting/102609654?utm_source=abc_news_web&utm_medium=content_shared&utm_campaign=abc_news_web

Interrupted holidays to give a quick talk at UTAS today, got an ice core lab tour in exchange! Worth it.

#antarctica #iceCore #palaeo #tassie #holidays

A woman smiling into camera holding a cylinder of ice! She's standing next to boxes that say "ice cores keep frozen"

After #COVID delays, the #IceCore drilling camp ( @egripcamp ) in North East #Greenland is back up and running again this season and will soon hit the base of the
This is a cool thread showing how deep the core is from @agrinsted + @iceadvice

https://fediscience.org/@iceadvice/110436990668023814

#IceCore

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