@louisesandbergs.bsky.social and @nataliahavelund.bsky.social attended the CCI colocation meeting last week. There were many important discussions on the future of the programme. Thanks for having us!

Excited to kick off ESA’s HARMONY Validation Concept Consolidation & Verification Methodology project, managed by CLS. Proud to lead land ice calibration & validation planning. DTU team: Kristina, Sebastian & Stine. Harmony (launch in 2029) will advance insights into land deformation & glaciers

🚨 Applications open! Join us for The Polar Climate Space: a week‑long #hackathon (24–30 Aug) bringing together #ECRs to tackle #Arctic & #Antarctic challenges using #EO, #climate models, in‑situ data & #ML. More info below! 👉 ECR form: tinyurl.com/ycy57mvj 👉 Senior scientists: tinyurl.com/2p9tv992

Big congrats to Anna for defending her PhD on surface mass balance using EO data 👏🎓✨ And of course, the celebration included a proper cake with P H D spelled out on top 🎂 #PhD #PhDDefense #SurfaceMassBalance #EarthObservation #Cryosphere

Last week, researchers came together for the Danish Antarctic Science Seminar at @ucph.bsky.social to discuss the most recent studies of Antarctic science! @tabea-rettelbach.bsky.social showed how the @esa.int Digital Twin can be used to explore "what-if" scenarios for the Antarctic Ice Sheet ❄️

❄️Theory and practice❄️ (Part 2) This week in Sisimiut we continue our Extreme Climate and Physical Nature course on the Arctic Semester by diving into snow physics. After covering the theory, students headed into the field to explore the snowpack firsthand. #CryoTeaching #ArcticDTU #SnowScien

New paper alert! 📄 How do Arctic tundra landscapes develop after a wildfire? 🔥 Using high-resolution lidar DEMs and a space-for-time approach, @tabea-rettelbach.bsky.social examined how ice-wedge polygon terrain in Alaskan permafrost landscapes changes following a fire. doi.org/10.1088/1748...

❄️Theory and practice❄️ In Sisimiut, Greenland, we teach a DTU course called Extreme Climate and Physical Nature on the Arctic Semester. Earlier this week 30+ students practiced drilling in the ice on the lake in the center of town after learning the theory last week. #CryoTeaching #ArcticDTU

Our PhD Student @mikkelaabykruse.bsky.social is currently getting a taste of what it is like to do fieldwork in the Arctic at The University Centre in Svalbard (UNIS)❄️🥽 🧤 Working on a glacier is no safe or easy task, and UNIS is a great place to learn the ropes of what it means to be a glaciologist!

🚀 Excited for Copernicus @esa.int #CRISTAL! This mission’s dual‑freq Ka/Ku #altimeter aims to measure snow depth on sea ice. A new UiT‑led study (feat. @reneefredensborg.bsky.social) explores current laser/radar data + simulates CRISTAL waveforms. Check it out ➡️ tc.copernicus.org/articles/20/... ❄️🧊

One year into the ESA Digital Twin (DT) Earth Ice Sheets project ❄️@eo4cryo.bsky.social and @tabea-rettelbach.bsky.social with other @esa.int DTs at the science meeting in Frascati to present the pre-operational dtc-ice-sheets.org & new ideas for holistic data cubes 🛰️🌐 #DigitalTwinEarth #IceSheets

🍾🥂One of our most exciting pieces of news this month must be the hand-in of Anna Puggaard's PhD thesis on "Earth observation for surface mass balance" on January 15, celebrated with cake and bubbles! We look forward to seeing her in the office as a postdoc in February, after a well-deserved break! 🏝️

New paper hot off the press in #IEEE JSTARS from our very own @kirkscanlan.bsky.social rkscanlan.bsky.social and @eo4cryo.bsky.social along with @anja-ruti.bsky.social l from #GEUS 🔥🔥 Find it here ieeexplore.ieee.org/document/113...

📢 Going to #EGU26? Do you work with #radars on icy and rocky surfaces? ➡️Look no further! Submit an abstract to this session, convened by our @kirkscanlan.bsky.social and @reneefredensborg.bsky.social with Hameed Moqadam! The deadline is fast approaching ⌛ - submit by 15 January 2026 at 13:00 CET!

Great to be at the 2026 Greenland Ice Sheet Seminar at the Niels Bohr Institute with cryosphere colleagues. Photo: @kirkscanlan.bsky.social presenting for DTU Space. #GreenlandIceSheet #Cryosphere #DTUSpace

🌟Meet our Group🌟 @mikkelaabykruse.bsky.social is a PhD student in the Cryo Group. He uses satellite remote sensing to study lakes hidden beneath the Greenland Ice Sheet 🛰️🧊🌊 Some of these lakes can contain and later release enormous amounts of meltwater. #Cryosphere #RemoteSensing #Greenland

To round off the year and just before Christmas, I had the amazing opportunity of spending the last week in Calgary, Alberta, meeting my colleagues at @ucalgary.bsky.social while participating in the ArcticNet's Annual Science Meeting #ASM25, and presenting my #MEOPAR funded project #SNOWMASS ❄️🛩️🛰️! ➡️

🌟Meet our Group🌟 Sebastian B. Simonsen (@eo4cryo.bsky.social) is a senior researcher using satellite altimetry to study ice sheets, sea-level change, snow, and ice dynamics. Lately focused on data-driven models and digital twins. PI for Digital Twin Ice Sheets.‬‬‬‬‬‬ Also involved in C3S and CCI.

Our colleague @tabea-rettelbach.bsky.social is developing dynamic data cubes for #EO data over ice sheets (literally 🧊). The goal is to make complex geospatial datasets easier to find, access, and use for e.g. modelers. #datacubes @icelink-project.bsky.social #PISCO #DTC_icesheets

We have provided new Greenland Ice Sheet mass loss estimates to @polarportal.bsky.social. These are derived from the #GRACE and #GRACE-FO missions, and show that since the launch of GRACE in 2002, the ice sheet has lost approximately 5200 gigatonnes of ice!

We have provided new Greenland Ice Sheet mass loss estimates to @polarportal.bsky.social. These are derived from the #GRACE and #GRACE-FO missions, and show that since the launch of GRACE in 2002, the ice sheet has lost approximately 5200 gigatonnes of ice!

Heading to #EGU26 and use #radar to study terrestrial and planetary surfaces (both icy and rocky 🤯)? Have we got the session for you! Consider submitting an abstract to #EGU26 CR6.3 by January 15 2026. Read more about the session here www.egu26.eu/session/56853 Hope to see you there!

It may be difficult for the untrained eye to see - but we were of course dressed in the colors of glaciers at last weeks Christmas party at DTU Space🧊❄️🎄

Rasmus and @tabea-rettelbach.bsky.social are in Budapest this week at HungaroMet for the PISCO & @polarres.bsky.social hackathon! 🇭🇺 With 20 other students and instructors, they’re exploring projects that combine climate model outputs with in-situ and EO data to better understand our Polar regions.🌍❄️

Last week we attended DTU Project Day and had great conversations with many interested students about potential new projects 🛰️❄️ #DTU #ProjectDay #StudentProjects #Research #Cryosphere #RemoteSensing #IceSheets

We’re attending the IGS Nordic Branch Meeting 2025 in Copenhagen, at GEUS. Great to meet colleagues, hear exciting talks, and spark new discussions on ice, climate and modelling ❄️🧊📊 #Cryosphere #Glaciology #ClimateScience #IceSheet #PolarResearch #NordicScience #IGS2025

DTU Space was at the Danish Climate Science Symposium 2025 🇩🇰 We’re shared a handful of posters and a talk by Sebastian B. Simonsen: “From Satellites to Digital Twins – Monitoring the Greenland Ice Sheet.” Great discussions on climate, ice, and models! ❄️ #DTUSpace #Greenland #Cryosphere #DMI

Our office is now ready for Halloween 🎃 🎃

📢 New publication! Ahead of #ESA #CRISTAL, we explore dual-frequency #altimetry for estimating 🧊 snow depth over sea ice. 🛩️ Part 1: Airborne multi-freq altimetry → snow depth 👉 tc.copernicus.org/articles/19/... 🛰️ Part 2: Compare w/ CryoSat-2 & ICESat-2 #CRYO2ICE 👉 tc.copernicus.org/articles/19/...

We are proud to be contributors to a chapter on Arctic land ice and its changes in the #AMAP Assessment Report 2026!❄️ #AMAP (Arctic Monitoring and Assessment Programme) is the working group under the #ArcticCouncil that produces science-based assessments to inform policy and decision-making ❄️

Antarctica is undergoing “greenlandification,” with ice loss processes mirroring Greenland ❄️🌍 New paper out in Nature Geoscience with DTU Space contributions on key signs: doi.org/10.1038/s415... #ClimateChange #Antarctica #Greenlandification

🌍✨Great energy at DTU Space with a visit from Unge GIS Brugere! Yesterday, we welcomed GIS users to #DTUSpace. The visit focused on spatial data from #EarthObservations and methods for tackling geospatial challenges, highlighting the importance of precise geospatial data in the Arctic and beyond 🌍❄️

Last week, @reneefredensborg.bsky.social, Kristina Belinska and Stine Rose enjoyed the Mediterranean sun ☀️ in Crete while presenting results from @esa.int projects #S3MPC #St3tART-FO #IN-PROVA #CCI on calibration and validation of satellite altimetry during the calval4altcrete2025.eu ➡️

Congratulations to Behzad Forouzi Feshalami for defending his PhD thesis: "Numerical modeling of wave-induced erosion of floating icebergs" - a valuable contribution to improving our understanding of ice–ocean interactions! 🌊🧊 In collaboration with #NTNU, supervised by @spacehsk.bsky.social 🎓

Last week, @eo4cryo.bsky.social and @spacehsk.bsky.social were in Iceland and NE Greenland on an airborne #FieldCampaign sampling key data over #SeaIce and #LandIce with a brand-new instrument #CRISTALair🛩 Cutting-edge science in action, unlocking insights for future satellites🛰 #EarthObservation

Brand new website for the Cryo Group at DTU is now live! Thanks to @reneefredensborg.bsky.social for making us look so good 🤪 www.space.dtu.dk/english/rese...

Three new papers co-authored by @tabea-rettelbach.bsky.social have just been published! A little outside of our usual focus on the cryosphere, as these studies span broader Arctic remote sensing applications: aerial imagery 🛩️, methane emissions🫧, driftwood 🪵. Details and links in the comments ⬇️

These past three days, @reneefredensborg.bsky.social, @tabea-rettelbach.bsky.social ‬& @kirkscanlan.bsky.social participated in the Symposium on Technology Advancement for Ice Remote Sensing (STAIRS) in Copenhagen, organised by the University of Copenhagen and the University of Manitoba 🛰️❄️

Welcome to our new bachelor students! 🎓 Yesterday marked the start of the new study year at DTU, where we welcomed 42 new bachelor students to our Earth and Space Physics and Engineering programme. Our head of study Sine Hvidegaard made sure the students got a good intro to their new student life.

Congratulations to DJ Upside Down Turtle and DJ Disco Disc for their triumph in the inaugural Cryosphere Group Disc Golf Championship! 🥳🥳 A lovely afternoon spent with great colleagues and only "a few" discs had to be dug out of trees or fished out of water. Time to start practicing for next year 🙃

📢 A new study pinpointing 📌 differences in RCM melt extent using observations from ASCAT 🛰️ is out! Led by our PhD student Anna Puggaard with @louisesandbergs.bsky.social, @eo4cryo.bsky.social and colleagues from @dmidk.bsky.social, GEUS and ENVEO. Interested? See ➡️ tc.copernicus.org/articles/19/...

Exciting news from our team to start the weekend! 🎉Our own eo4cryo.bsky.social has joined the Strategic Advisory Board for the EU’s #DestinationEarth initiative 🌍 Read more about the expectations for the initiative and @eo4cryo.bsky.social's role here: www.dtu.dk/english/news...

Better late than never. Big thanks to @anja-ruti.bsky.social and @eo4cryo.bsky.social for all their help as we try to unravel #Greenland Ice Sheet surface roughness from radar altimetry. Hat tip to the @esa.int Living Planet Fellowship program for supporting this work! doi.org/10.5194/tc-1...

📢Just before a busy summer, a new paper dropped by our very own @kirkscanlan.bsky.social and @eo4cryo.bsky.social with @anja-ruti.bsky.social and our friend Nicolaj Hansen from @dmidk.bsky.social ➡️ doi.org/10.1038/s415...

And why not one more while we're at it. Have you ever wondered how surface conditions across #Greenland change with time? Us too! Here we recovered 11 years of "surface" density changes from satellite altimetry. A whole new window into how Greenland is changing. doi.org/10.1038/s415...

We have contributed to this interesting paper, which has been published today: 🧊 It shows a rare subglacial flood in Greenland, where water forced its way upward through the ice sheet. 📡 Satellite data revealed this event was triggered by rapid drainage of a hidden lake beneath the ice .

🌐❄️ 𝗧𝗵𝗲 𝗻𝗲𝘄 𝗣𝗼𝗹𝗮𝗿 𝗣𝗼𝗿𝘁𝗮𝗹 𝘄𝗲𝗯𝘀𝗶𝘁𝗲 𝗶𝘀 𝗹𝗶𝘃𝗲! 🔗https://polarportal.dk/en/ Here it is: the updated 𝗣𝗼𝗹𝗮𝗿𝗽𝗼𝗿𝘁𝗮𝗹.𝗱𝗸 – your gateway to 𝗿𝗲𝗮𝗹-𝘁𝗶𝗺𝗲 𝗱𝗮𝘁𝗮 𝗼𝗻 𝗔𝗿𝗰𝘁𝗶𝗰 𝘀𝗲𝗮 𝗶𝗰𝗲 𝗮𝗻𝗱 𝘁𝗵𝗲 𝗚𝗿𝗲𝗲𝗻𝗹𝗮𝗻𝗱 𝗜𝗰𝗲 𝗦𝗵𝗲𝗲𝘁. The portal is powered by DMI, GEUS, DTU Space and DTU DTU Byg and supported by data from Asiaq and PROMICE.

Happy to be at #lps25 !! 🛰️

🛰️Will we see you at the #LPS25? 🌎 If you're heading to the Living Planet Symposium in Vienna next week, let us know – we would love to connect! ❄️ Have a look at the following posts about where you will find us and what we will be presenting during the week!

🚀We are excited to kick off the EO4Change course this week - for the 4th time! 🌍 This year, we mirror the C3S EO service chain & dive into ESA’s data-driven Digital Twin Components for DestinE. Students will develop & present their own EO-based climate service! #EO4Change #DestinE #C3S @esa.int