Renée M. Fredensborg Hansen

Our office is now ready for Halloween 🎃 🎃

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

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

Multi-frequency altimetry snow depth estimates over heterogeneous snow-covered Antarctic summer sea ice – Part 1: C∕S-, Ku-, and Ka-band airborne observations Abstract. The recent alignment of CryoSat-2 to maximise orbital coincidence with the Ice, Cloud, and land Elevation Satellite-2 (ICESat-2) over the Southern Ocean and Antarctica in July 2022, known as...

📢 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/...

Group picture!

We’re the Cryosphere Research Group at DTU Space, studying the polar regions using satellite remote sensing. We monitor and map changes in snow & ice, assess polar climate change impacts, and provide data to imporve polar climate models. Follow for polar science insights! ❄️#Cryosphere #PolarResearch

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 ❄️

The Greenlandification of Antarctica - Nature Geoscience Climate and ice sheet processes in Antarctica increasingly reflect those observed earlier in Greenland. Applying process insights from Greenland can improve projections of future Antarctic ice and climate behaviour.

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

Mai is presenting PRODEM for the 2019 summer, focusing on three big outlet glaciers. More interested in PRODEM? Have a look at the paper: https://doi.org/10.5194/essd-16-5405-2024

🌍✨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, @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

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 🎓

Presentation - Session 9: Cryosphere Altimetry Calibration/Validation I

S9-28: Operational Fiducial Reference Measurements over Sea Ice in support of Sentinel-3 validation (ESA St3TART-FO project) 🛰️🛩️❄️🧊 #St3TART-FO

Presentation - Session 9: Cryosphere Altimetry Calibration/Validation I

S9-14: Validation Methodologies for CRISTAL In-Flight Level-2 Land Ice Products – An Overview from the CRISTAL IN-PROVA Project 🛰️🛩️❄️ #IN-PROVA

Suggestions for #CRISTAL validation? Submit here ➡️ forms.office.com/e/LkSrJnPFTh

Dual-hemisphere sea ice thickness reference measurements from multiple data sources for evaluation and product inter-comparison of satellite altimetry Abstract. Sea ice altimetry currently remains the primary method for estimating sea ice thickness from space, however time-series of sea ice thickness estimates are of limited use without having been ...

Presentation - Session 10: Cryosphere Altimetry Calibration/Validation II

S10-33: Dual-hemisphere Sea Ice Reference measurements from multiple data sources tailored for evaluation and product inter-comparison of satellite altimetry 🛩️❄️🧊 #CCI

Interested? essd.copernicus.org/preprints/es...

Poster Session

SP-43: Validation Methodologies for CRISTAL In-Flight Level-2 sea ice and iceberg products within the framework of the CRISTAL IN-PROVA Project 🛰️🛩️❄️🧊

Suggestions for validation scenarios or data to support #CRISTAL and synergies with CEMs? ➡️Submit here: forms.office.com/e/KkVhdzTwth

2nd International Review Workshop on Satellite Altimetry Cal/Val & Metrology 2nd International Review Workshop on Satellite Altimetry Cal/Val & Metrology The 2nd International Review on Satellite Altimetry Calibration/Validation (Cal/Val) and Metrology is to be held in Chania,...

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 ➡️

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...

Kirk, Reneé & Tabea

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.

See you at #LPS25? On my way on the Nightjet towards Vienna, and preparing the final slides for my presentation, tomorrow called "Challenging Traditional Methodologies Applied for Snow Depth Retrieval Using Near-Coincident Multi-Frequency Altimetry" in Hall E1 between 16:15-17:45!

🚀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

We should learn from TU Delft! The PhD-defense at DTU would be more festive with this amazing dresscode 🎓
#DTUfashion #LoveHats

Our PhD student Mikkel and adjunct professor Nanna (@icymatters.bsky.social‬) just returned from 10 days in the beautiful Italian Alps at the annual Karthaus summer school! The summer school offers an intro to ice sheets, glaciers, and their role in the climate system🏔️❄️ 📘
#glaciology #Karthaus25

Photo: Louise Sørensen

We just wrapped up an inspiring session in our #Geodesy and #EO division! 🌍
Everyone had 4 minutes to share what they’re working on. In just one hour, we gained a fresh view of projects and research. It wasn’t easy sticking to the time limit, but that challenge made the stories even more engaging 🚀

📢 #St3TART-FO aimed at providing accurate, traceable validation data to support #Sentinel-3, with our own Henriette Skourup as thematic lead for sea ice and @reneefredensborg.bsky.social on the team, marked a major milestone and is operational! ➡️ sentinels.copernicus.eu/web/success-...

About last night🥳🥳
DTU commemoration 2025.