For the second year, our group has joined the national Vi Cykler Til Arbejde #vcta (We Bike to Work) campaign in the month of May! 🚴‍♂️🚴‍♀️💨💨 Our "Polar Pedalers"❄️🥶 team biked 166 days and 2767 kilometers with Anna and Kirk leading the team in total bike days and bike kilometers!

One of the ways we study Greenland Ice Sheet mass balance: tracking annual changes in ice surface elevation using CryoSat-2 and ICESat-2. A popular science piece (in Danish 🇩🇰) out now in @Geoforum issuu.com/geoforum5/do... #PROMICE #PRODEM #Massbalance

The @imaqa.be SILA expedition has completed its 1,700 km ski kite traverse of the Greenland Ice Sheet, reaching Qaanaaq on May 18th 🎉 All four explorers are home safe and the GNSS elevation data collected for DTU Space is on its way. Proud to have supported the science behind this exciting mission.

We finished the month of May with a DTU Cryosphere Pétanque (or Boules) Tournament in the sun ☀️🌻 The winning team was "Mass Balance Issues"!

Excited to share that the first version of the @esa.int #DTCIceSheets is now available! 🎉 You can now explore this big step toward an interactive #EO-driven #DigitalTwin via the platform and its datasets, modules, and use cases for Greenland and Antarctic ice sheets online on dtc-ice-sheets.org 🌍🧊

Excited to share 📄✨ our new paper on #Sentinel-3 radar over the #GreenlandIceSheet - accepted in #IEEEJSTARS & out as a preprint: ieeexplore.ieee.org/document/115... 🔍 It started with an unusual signal: very low radar backscatter in N Greenland (summer 2023)…

Greetings from Karthaus. It is always a pleasure to be back in the beautiful setting of the Karthaus summer school. This year, Rasmus is attending the course, and Nanna and Louise are teaching.

Kicked off May at #EGU26 in Vienna - a week packed with talks, posters & inspiring discussions. Back in the office full of fresh ideas 💡 - and thanks to sunny weather + rental bikes, the #BikeToWork #VCTA streak rolled on even from Vienna 🚴‍♀️ #PolarPedalers

☀️ Spring has finally arrived in Copenhagen ☀️ The team celebrated the good weather by painting flower pots and planting some (small-ish) sunflowers to brighten up our offices during our social event🌻

Over the past few weeks, @reneefredensborg.bsky.social and @spacehsk.bsky.social have been hands‑on in the #CEMSIE field campaign — coordinating and contributing to ground-based snow ❄️ and sea ice 🧊 observations, as well as helicopter and airborne operations with #CRISTALair 🛩️❄️🧊

📢 Want to hear more about the EO-based activities of our group? Meet us at #EGU26 @egu.eu next week, we'll be around with the following presentations and sessions:

Introducing #PRODEM‑Xtract: An open‑source tool providing 32 m‑resolution annual ice thickness along Greenland Ice Sheet flux gates ❄️ Applied to major Greenland glaciers, it reveals previously unresolved dynamics, thereby improving estimates of solid ice discharge 🧊 Link: tinyurl.com/PRODEM-Xtract

The 2025 European State of the Climate is out now! Europe is the fastest-warming continent, warming more than 2x the global average. Read more and explore climate insights for Europe: climate.copernicus.eu/esotc/2025 Illustrations by: @copernicusecmwf.bsky.social #ESOTC2025 #CopernicusClimate

🧊 New paper out from the ESA CCI Sea Ice project led by DTU cryo. Advancing the use of independent, non‑satellite observations to validate satellite‑derived sea‑ice thickness - while tackling representativeness and uncertainty head‑on. 👏 @spacehsk.bsky.social, @reneefredensborg.bsky.social

We are a scientific partner of the SILA Greenland Mission 2026 with IMAQA ❄️ Using ski kites, the expedition will traverse the Greenland Ice Sheet from South to North and collect GNSS elevation data on behalf of DTU Space 🔗 www.imaqa.be/sila Sila means both weather and state-of-mind in Kalaallisut 🇬🇱

Just before Easter, Stine and Mary attended the 9th Sentinel Validation Team meeting, hosted by @esaearth.esa.int and @eumetsat.int in Frascati, Rome Great discussions on ice sheet products and multi-sensor synergy. We can't wait for the upcoming #Sentinel‑3C launch and tandem phases 🚀🧊 #Sentinel3

@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 🎓