Three things that might trigger massive ice sheet collapse | The-14

Scientists warn three instabilities could trigger irreversible Greenland and Antarctic ice loss, accelerating sea level rise and increasing the risk of flooding

The-14 Pictures

You launch your #Argo float to do one job... 2 and a half years later it pops up with with a stunning data set. It not ALL bad news ... just mostly. :(

Still ! BONUS ! brilliant engineering and deductions.

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Drifting in remote and wild seas for two-and-a-half years, the float spent about nine months beneath the massive Denman and Shackleton ice shelves. It survived to send back new data from parts of the ocean that are usually difficult to sample.
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https://theconversation.com/what-our-missing-ocean-float-revealed-about-antarticas-melting-glaciers-271201

Also the paper which outlines how they reconstructed the route of the intrepid float, and methodology etal.

https://www.science.org/doi/10.1126/sciadv.adx1024

#Antarctica #IceSheets #Science #GlobalWarming #Research #Lost

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.

The Conversation

Prince and Briner present a new sea level curve for the southern Nares Strait in Greenland. They find an GIA induced exponential lowering of relative sea level from the highstand of 85 m at about 9000 years ago.

#SeaLevel #Greenland #IceSheets #Geology

https://doi.org/10.1017/qua.2025.10049

A new relative sea-level curve from Inglefield Land, northwest Greenland | Quaternary Research | Cambridge Core

A new relative sea-level curve from Inglefield Land, northwest Greenland

Cambridge Core

Andrews et al investigate the sediment sources for Heinrich Events. They conclude most of the carbonate is derived directly from the Hudson Strait, and it is not from further sources in the Foxe Basin and Hudson Bay. The amount of ice margin retreat during Heinrich Events may have been limited.

#IceSheets #Canada #glaciers #geology

https://doi.org/10.1002/jqs.70024

Cofield and Darby analyze a sediment core located northwest of Svalbard for ice rafted debris. They make the surprising finding that the Barents Sea Ice Sheet may not have formed during the MIS 10 and 8 glacial periods, and that if the Arctic ice shelf existed, it may have been early MIS 6.

#IceSheets #Arctic #ClimateChange

https://doi.org/10.1016/j.quascirev.2025.109684

Suganuma et al provide a thorough examination of the Holocene collapse of the Lützow-Holm Bay ice shelf in Antarctica. They pinpoint when the collapse happened by investigating the beryllium isotopes. When the bay became open ocean, cosmogenic ¹⁰Be could reach the sediments.

#Antarctica #IceSheets #SeaLevel

https://d oi.org/10.1038/s41561-025-01829-7

Pochocka-Szwarc et al present some stratigraphy of the MIS 12 glaciation of southeastern Poland, and the subsequent interglacial in MIS 11. This area was also glaciatied in MIS 16, but never reached by the MIS 6 or 2 ice sheets.

#IceSheets #MIS11 #ClimateChange

https://journals.pan.pl/dlibra/publication/155951/edition/136949/content

Evidence for the Presence of the Sanian 2 Glaciation (MIS 12) Ice-Sheet – A Case Study of Palaeobasins from the Mazovian Interglacial (MIS 11c) and Terrain Relief in Wantopol Site (E Poland) - Acta Geologica Polonica - PAS Journals

Polish Academy of Sciences

Coming back to this at #NCKF25 where my former boss (+IPCC lead author) Jens Hesselbjerg Christensen is looking at #Eemian #SeaLevelRise

Not quite as catastrophic as the MWP1a but still large. I wonder if this has been updated recently at all?

https://fediscience.org/@Ruth_Mottram/115304238980577506
Ruth_Mottram - This plot on wikipedia was made by @RARohde based on data published in late 90s and early 00s. Wondering if this has been updated or if there is new understanding on any of these palaeo records?

#Palaeoclimate #SeaLevelRise #IceSheets
Maybe @DrEvanGowan has thoughts? Anyone else?

What are climate tipping points? They sound scary, especially for ice sheets and oceans, but there’s still room for optimism | The-14

Climate tipping points are irreversible changes in Earth’s systems like ice sheets and rainforests, but swift action can still prevent the worst impacts.

The-14 Pictures

This plot on wikipedia was made by @RARohde based on data published in late 90s and early 00s. Wondering if this has been updated or if there is new understanding on any of these palaeo records?

#Palaeoclimate #SeaLevelRise #IceSheets
Maybe @DrEvanGowan has thoughts? Anyone else?