#ice-sheet — Public Fediverse posts

I'm always excited to work on thumbnails for New Nature's videos since they always involve cutting some earth in half.

#scienceillustration #education
#geology #physics #sciencefigures #icesheet #antarctica

Thermal Convection Reveals Swirling Structures Deep Within Greenland’s Ice Sheet

📰 Original title: Scientists discover giant swirling plumes hidden deep inside Greenland’s ice sheet

🤖 IA: It's not clickbait ✅
👥 Usuarios: It's not clickbait ✅

View full AI summary: https://killbait.com/en/thermal-convection-reveals-swirling-structures-deep-within-greenlands-ice-sheet/?redirpost=9e3f70c9-29a5-4b48-b3d3-3b8fd65881a8

#climatechange #greenland #icesheet #thermalconvection

Thermal Convection Reveals Swirling Structures Deep Within Greenland’s Ice Sheet

📰 Original title: Scientists discover giant swirling plumes hidden deep inside Greenland’s ice sheet

🤖 IA: It's not clickbait ✅
👥 Usuarios: It's not clickbait ✅

View full AI summary: https://killbait.com/en/thermal-convection-reveals-swirling-structures-deep-within-greenlands-ice-sheet/?redirpost=9e3f70c9-29a5-4b48-b3d3-3b8fd65881a8

#climatechange #greenland #icesheet #thermalconvection

🧊 How stable is Greenland’s ice sheet? New #MPIM research reveals 4️⃣ different steady states of the Greenland #IceSheet under a pre-industrial climate. Using a novel fully-coupled Earth System-Ice Sheet Model, Malena Andernach et al. found a critical threshold of 70-83% of pre-industrial ice volume, below which 50-80% of its current volume would be irreversibly lost even if returning to pre-industrial CO2 concentrations.

🗺️ CC BY 4.0 Andernach et al. 2026
📖 https://tc.copernicus.org/articles/20/1047/2026/
#ClimateChange

Greenland thoughts from Antarctica..

I’m in Antarctica and yet I have been getting contact from journalists because Greenland is all over the press at the moment for all the wrong reasons. It’s reasonable I think to worry about what the various deranged threats towards Greenland will mean for us all also outside of Greenland. But I also think about (and yes, worry) about the friends I’ve made in Greenland over the years. Let’s hope common sense prevails and we can step back from the brink, and concentrate on the really long term problems that we are still rapidly storing up for ourselves.

Greenland is also on my mind, not just because of geopolitics, but also because the Copernicus Climate service has just put out their annual global climate highlights* for 2025 report with some disturbing results from Antarctica.

A few months ago we had a paper published called the Greenlandification of Antarctica, in which we argue that the changes in the Antarctic cryosphere increasingly resemble those we have previously observed in Greenland and the Arctic. To see the future of Antarctica, look at Greenland.

It’s been a busy time preparing for fieldwork and I didn’t manage to write anything here about it at the time, but this few eye-opening figure rather supports some of our arguments.

In this graphic, the 2025 temperature over the Antarctic region was 1.06°C higher than the average between 1991 and 2020 (a temperature anomaly). This is actually higher than any other region except the Arctic, where the temperature anomaly was reported to be 1.37°C above the 30 year average (bear in mind also that between 1991 and 2020, the temperature was also much increasing, so we’re not comparing with a pre-industrial climate here). Polar amplification was predicted long ago and as those first experiments found, it also is seen more in the Arctic than the Antarctic – but these results are a first hint of the amplification that is perhaps appearing now and may come to stay in the Antarctic.

In our paper we show the figure below (many thanks to illustrator Jagoba Malumbres-Olarta for the fine work), which shows five different cryosphere properties that are changing: 1) shrinking sea ice, 2) glacier velocities that show a seasonal cycle (mostly detected on the peninsula so far, though there are indications that Totten glacier for example has some kind of seasonal cycle, possibly modulated by sea ice), 3) total ice sheet mass loss, 4) ice shelf area and 5) annual mean surface temperature. In virtually all, the changes look very similar between Greenland and Antarctica, but with the crucial difference that the speed of changes is so far faster and more advanced in Greenland.

The latter surface temperature plot is not the same as the Copernicus 2m air temperature which is based on the ERA5 reanalysis (so a blending of computer model with observations from satellites, weather stations, balloons, ships, planes etc). In our paper we wanted to focus on the contribution that satellite data has brought as we simply have so few direct in situ observations, so we used skin or surface temperature which is measured from satellites. It’s a somewhat theoretical construct, imagine a very thin surface (hence skin) layer, where incoming and outgoing energy are summed up to give a temperature. This is calculated over both ice sheets and sea surface by our colleagues in the satellite group at DMI and this is the dataset we used here. Their results which stretch back to the 1980s show a slow upward trend in Antarctica and a steeper change in Greenland, the record stopped in 2021 in our paper but it actually shows an upward increase since and that’s also borne out by the Copernicus results. In climate and weather models we in fact first calculate the skin temperature and then back interpolate to 2m temperature, so the two are very closely related.

To check that the satellite skin temperature record was accurate, I also looked at some of the longer in situ records, the South pole station for example has a long record and shows a small increasing trend over the last 30 years or so (which also may be attributable to natural causes, it is hard to pick out the global warming trend). Analysis of the record also shows that it is largely due to decreasing cold extremes rather than necessarily higher warm extremes. Again, a pattern we also observe in the Arctic.

The analogy is not exact. As a continent, Antarctica is much further south than Greenland is to the north and it is much more insulated from warming by the circumpolar ocean than the Greenland ice sheet, sticking out in the middle of the Atlantic is. In a very real sense then, geography is destiny. Surface melt, which is also not nearly as common here in Antarctica mostly refreezes in the snowpack, whereas in the lower parts of Greenland it generally runs off and contributes directly to sea level rise. That has not yet become a major process in Antarctica, it’s still colder here and there is less surface melt for now, although from our own observations in the field, much more than I’d expected. Surface melt is definitely something we need to keep an eye on and some of our observations show how tricky that is, especially given disagreements between satellite sensors on this point .

But these are all details, the point is that Antarctica is also part of the global climate system and the same processes we’ve been observing for more than three decades in Greenland are now also starting to become apparent here too.

In one other respect Antarctica is becoming more similar to Greenland – it is becoming more contested. The Treaty that has governed Antarctica is vulnerable and subject to the same weakening of the global order that is now playing out in the North.

Let’s hope that geopolitics can settle down soon so that we can start to tackle the more serious and longer term crises coming down the line.

*I’m not sure “highlights” is quite the right word either – maybe “lowlights” would be better, but then it also starts to sound like a report on hairstyles…

#Antarctica #climate #climateChange #environment #globalWarming #Greenland #GreenlandIceSheet #iceSheet #Science

What Greenland’s Ancient Past Reveals about Its Fragile Future

The collapse of the world’s second-largest ice sheet would drown cities worldwide. Is that ice more vulnerable than we know?

July 2025 issue

https://www.scientificamerican.com/article/greenlands-ice-sheet-collapse-could-be-closer-than-we-think/

#Greenland
#IceSheet

Also on the #iQ2300 expedition and posting in the fediverse is @Mercerraa - an early #FF for more #Antarctic #FieldPhotos

https://pixelfed.social/p/IceClimate/907370919769941146
[email protected] - Wasa station. After a morning of safety training and snow scooter training, we unpacked and I took our snow optical sensors for a walk to test the surface snow grain sizes. All present and correct.
A good view from the moraine over the station and the vast whiteness of the #iceSheet beyond.
#iQ2300 #Antarctica #FieldworkPhoto #OceanIceEU #PRECISEnnf

Antarctic Meltwater Alters Future Projections Of Climate And Sea Level
--
https://doi.org/10.1038/s41467-025-64438-3 <-- shared paper
--
https://doi.org/10.7275/6t64-wy56 <-- shared link to scripts for running the models and creating the figures in this data repository
--
#GIS #spatial #mapping #model #modeling #sealevel #sealevelerise #meltwater #Antarctic #projection #forecast #global #climatechange #icesheet #massloss #refinement #meansealevel #SouthernOcean #fluvial #pluvia; #precipitation #overturningcirculation #heattransport #temperature #Pacific #Atlantic #ocean #marine #spatialanalysis #spatiotemporal

Scientists issue warning after uncovering alarming data from mountain summit — here’s what you need to know

Researchers were shocked to discover that a weather station at the top of the Greenland ice sheet had…
#NewsBeep #News #US #USA #UnitedStates #UnitedStatesOfAmerica #Environment #Arcticseaice #Greenland #Greenlandicesheet #icesheet #Science #Sealevelrise
https://www.newsbeep.com/us/66575/

Next week our ECR group are starting a #MachineLearning sprint to speed up the development of our new #IceSheet surface mass budget emulation models.

I'm looking for hints, ideas tips and inspiration to help smooth and accelerate the process.

If you're used to working in #Sprint mode, what in your opinion makes it work or otherwise hinders it?

What can I as supervisor do to make it run better?
And how should we celebrate it's conclusion?

Also, should me do an #AMA on the process?

#ClimateScience #IceSheets #Greenland #Antarctica

@Snoro

These happenings remind me strongly of a gripping novel I once read, making me shiver and think about my own consuming of resources:
The Sands of Sarasvati (Sarasvatin hiekkaa), in German Die Schmelze (The Melting)
by Risto Isomäki, scientific editor, environmental activist and author.

The novel is about scientists discovering huge lakes and rivers underneath and in the #Greenland #icesheet threatening to break loose.
If one wants to get the feeling how global #ClimateCatastrophe is threatening the earthly world as we know it now this is a strongly recommended read.

https://www.goodreads.com/book/show/35395167-the-sands-of-sarasvati

Glacial Landforms And Rock Types [In Puget Sound Area, Washington State, As Seen With LiDAR]
--
https://wa100.dnr.wa.gov/puget-lowland/glacial-landforms <-- shared technical article
--
[my old stomping grounds as an engineering geologist, back when the PSLC first came out with its then ‘as if by magic’ LiDAR products around the Puget Sound…]
#geology #landform #geomorphometry #GIS #spatial #mapping #geomorphology #glacial #glacier #LiDAR #engineeringgeology #remotesensing #Seattle #PugetSound #WashingtonState #deposition #rock #sediments #till #water #hydrology #hydrography #melting #outwash #moraine #erratic #striation #boulder #icesheet #kettle #lake #WADNR

Reconstructing Ice-Margin Retreat Using Delta Morphostratigraphy
--
https://doi.org/10.1038/s41598-017-16763-x <-- shared paper
--
[an older paper, but fascinating - and well presented, especially the images/figures]
#GIS #spatial #mapping #icemargins #ice #delta #morphostratigraphy #paleogeography #icesheet #glacier #glacial #icesheet #glacialretreat #geology #landform #geomorphometry #geomorphology #LiDAR #engineeringgeology #remotesensing #icecontact #fluvial #water #hydrology #erosion #distal #glaciofluvial #paraglacial #sediment #deposition #quebec #canada #LaurentideIceSheet #retreat #delta #drainage #physiography #Québec

If I didn't have 2 papers to (re)submit and two reports due at the ECMWF and ESA, I would write a quick blog post on how interesting it is that our modelled melt over the #Greenland #IceSheet on the @polarportal and the satellite derived melt areas almost but don't quite match, and why that might be...

https://fediscience.org/@polarportal/114742683965565109

Land-Sea Linkages In The Arctic – What Is Paleoclimatology?
--
https://www.usgs.gov/programs/ecosystems-land-change-science-program/science/land-sea-linkages-arctic <-- shared technical article
--
https://doi.org/10.1371/journal.pclm.0000333 <-- shared example of paper
--
https://doi.org/10.47894/mpal.69.3.04 <-- shared example of paper
--
[who doesn’t like a good foraminifera! (memories of staring down a microscope for hours at grad school) 😊 ]
#fedscience #Paleoclimatology #Paleoecology #Paleooceanography #Icesheet #climatechange #Paleoanthropology #Seaice #Marineecosystems #GIS #spatial #mapping #spatialanalysis #model #modeling #spatiotemporal #foraminifera #arctic #change #cryosphere #ArcticOcean #glacial #interglacial #Holocene #future

Sustained Decrease In Inland East Antarctic Surface Mass Balance Between 2005 And 2020
--
https://doi.org/10.1038/s41561-025-01699-z <-- shared paper
--
#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

🌐❄️ 𝗧𝗵𝗲 𝗻𝗲𝘄 𝗣𝗼𝗹𝗮𝗿 𝗣𝗼𝗿𝘁𝗮𝗹 𝘄𝗲𝗯𝘀𝗶𝘁𝗲 𝗶𝘀 𝗹𝗶𝘃𝗲!

We’re excited to launch the updated version of 𝗣𝗼𝗹𝗮𝗿𝗽𝗼𝗿𝘁𝗮𝗹.𝗱𝗸 – your gateway to 𝗿𝗲𝗮𝗹-𝘁𝗶𝗺𝗲 𝗱𝗮𝘁𝗮 𝗼𝗻 𝗔𝗿𝗰𝘁𝗶𝗰 𝘀𝗲𝗮 𝗶𝗰𝗲 𝗮𝗻𝗱 𝘁𝗵𝗲 𝗚𝗿𝗲𝗲𝗻𝗹𝗮𝗻𝗱 𝗜𝗰𝗲 𝗦𝗵𝗲𝗲𝘁.

📊 On 𝗣𝗼𝗹𝗮𝗿𝗽𝗼𝗿𝘁𝗮𝗹.𝗱𝗸, Danish research institutions share up-to-date monitoring and expert knowledge on the state of the Arctic cryosphere.

𝗛𝗲𝗿𝗲 𝘆𝗼𝘂 𝗰𝗮𝗻 𝗳𝗶𝗻𝗱 𝗱𝗮𝘁𝗮, 𝗮𝗻𝗶𝗺𝗮𝘁𝗶𝗼𝗻𝘀 𝗮𝗻𝗱 𝘂𝗽𝗱𝗮𝘁𝗲𝘀 𝗼𝗻:
• Surface conditions on the Greenland Ice Sheet and its major outlet glaciers
• Total mass balance of the Greenland Ice Sheet and its contribution to global sea-level
• Sea ice extent, thickness and volume in the Arctic
• Temperature anomalies of sea ice and the open sea in the Arctic
• Icebergs around Greenland

The portal is powered by the Danish research institutions #DMI, #GEUS, #DTUSpace and #DTUByg and supported by data from #Asiaq - Misissueqqarnerit - Grønlands Forundersøgelser and #PROMICE (https://promice.org/).

🔗 Visit the new site: https://polarportal.dk/en/

#PolarPortal #Greenland #Arctic #ClimateMonitoring #Cryosphere #IceSheet #Seaice #ClimateData #NCKF #climatechange

Scientists say next few years vital to securing the future of the West Antarctic Ice Sheet https://www.sciencedaily.com/releases/2025/06/250603115018.htm

#Antarctic #environment #ice #IceSheet

🚨📢 New Publication Alert

Our new study shows that the #WestAntarctic #IceSheet repeatedly crossed #TippingPoint thresholds in the past, with important implications for its future stability.

Press release: https://www.pik-potsdam.de/en/news/latest-news/scientists-say-next-few-years-vital-to-securing-the-future-of-the-west-antarctic-ice-sheet

Study: https://www.nature.com/articles/s43247-025-02366-2

🌊🧊❄️ 🌎

Study: collapse of #WestAntarctic #IceSheet could be triggered with very little #OceanWarming above present-day, leading to 4 metres of global #SeaLevelRise to play out over hundreds of years.
PIK researcher @juliusgarbe: “We have a narrow window to act.”
https://www.pik-potsdam.de/en/news/latest-news/scientists-say-next-few-years-vital-to-securing-the-future-of-the-west-antarctic-ice-sheet

Incidentally, while this is happening in the US, we have been working quite hard on the @polarportal (well @MartinStendel + out @dmidk colleagues have, I've mainly tried to make helpful comments), the old website is still up giving the latest on #Arctic #seaice #Greenland #icesheet and other datasets, but there's some fancy new stuff on the pipeline.
#StayTuned

https://nsidc.org/data/user-resources/data-announcements/user-notice-level-service-update-data-products

'The ice melted beneath our feet': The huskies that revealed the rapid shrinking of Greenland's ice.

In 2019, climate scientist Steffen Olsen took a startling photo of huskies appearing to walk on water.

The photo quickly went viral as it revealed the reality of Greenland's rapidly melting ice.

https://mediafaro.org/article/20250316-the-ice-melted-beneath-our-feet-the-huskies-that-revealed-the-rapid-shrinking-of-greenlands-ice?mf_channel=mastodon&action=forward

#Greenland #Arctic #ClimateChange #Meteorology #Science #Ice #Icecaps #Icesheet

New Map Of Landscape Beneath Antarctica Unveiled
--
https://phys.org/news/2025-03-landscape-beneath-antarctica-unveiled.html <-- shared technical article
--
https://doi.org/10.1038/s41597-025-04672-y <-- shared paper
--

#GIS #spatial #mapping #Bedmap3 #icebed #surface #thickness #gridded #datasets #Antarctica #raster #model #modeling #landscape #elevation #icesheet #survey #remotesensing #earthobservation #climatechange #warming #climate #melt #melting #seafloor #subglacial #geophysical #survey #topography #geology #bathymetry #topobathy #BritishAntarcticSurvey
@BritishAntarcticSurvey