Renée Mie Fredensborg Hansen

ESA's CryoSat mission@esa_cryosat

3

6

595

Renée Mie Fredensborg Hansen@rmfredensborg·5 Mar

We've investigated the CryoVEx/DEFIANT Antarctic 2022/2023 campaign data for the CRYO2ICE sea ice under-flight on December 13 2022 over the Weddell Sea in our preprint: egusphere.copernicus.org/preprints/2024…. Have a look, and let's discuss!

Airborne data from the ESA CryoVEx/DEFIANT Antarctic campaign of 2022/23 is now available on CS2EO! Time to delve in 👇 ‼️earth.esa.int/eogateway/news…

English

5

2

205

Renée Mie Fredensborg Hansen retweetledi

Earth Syst Sci Data@ESSD_journal·24 Eki

Discussion open for comments: Dual-hemisphere sea ice thickness reference measurements from multiple data sources for evaluation and product inter-comparison of satellite altimetry doi.org/10.5194/essd-2…

English

1

5

493

Renée Mie Fredensborg Hansen retweetledi

ESA's CryoSat mission@esa_cryosat·11 Eki

It was great to see @rmfredensborg present this at #Cryo2ice! New preprint: "Exploring microwave penetration into snow on Antarctic summer sea ice along #CryoSat and ICESat-2 (CRYO2ICE) orbit from multi-frequency air- and spaceborne altimetry" 👉egusphere.copernicus.org/preprints/2024…

English

2

7

209

Renée Mie Fredensborg Hansen@rmfredensborg·30 Eyl

This work could not have been possible with support form @esa @esa_cryosat and @DefiantNerc!

English

1

58

Renée Mie Fredensborg Hansen@rmfredensborg·30 Eyl

Suggestions going forwards? 1⃣ This is only one example of airborne data, we need to evaluate more to understand impact of different systems and sesonal signals! 2⃣ Modelling backscatter taking into account the differences between air- and spaceborne systems can provide insights!

Renée Mie Fredensborg Hansen tweet media

English

0

74

Renée Mie Fredensborg Hansen@rmfredensborg·20 Eyl

Just in time for #Cryo2iceSymposium next week! Have a look at our preprint on cracking the snow code from altimetry using multi-frequency airborne observations along a dual-frequency near-coincident @esa_cryosat and @NASA_ICESat2 orbit! Marking also the last study of my PhD! 🛰

The Cryosphere@EGU_TC

Discussion open for comments on @EgUsphere: Exploring microwave penetration into snow on Antarctic summer sea ice along CryoSat-2 and ICESat-2 (CRYO2ICE) orbit from multi-frequency air- and spaceborne altimetry doi.org/10.5194/egusph…

English

3

6

595

Renée Mie Fredensborg Hansen@rmfredensborg·30 Eyl

Excited for #CRISTAL? So are we! Take a look at our preprint investigating the potential for snow depth estimation from dual-frequency altimetry using current satellite missions, and get a taste of future expectations with simulations based on the design of #IRIS!

Jack Landy@jclandy

Take a look at our new preprint in @EGU_TC Anticipating CRISTAL: An exploration of multi-frequency satellite altimeter snow depth estimates over Arctic sea ice, 2018–2023 egusphere.copernicus.org/preprints/2024… @CIRFA_SFI @UiTNorgesarktis @Bristol_Glac @CPOM_news @DTUcryo @esa_cryosat @NASA_ICE

English

2

7

244

Renée Mie Fredensborg Hansen retweetledi

Jack Landy@jclandy·27 Eyl

Take a look at our new preprint in @EGU_TC Anticipating CRISTAL: An exploration of multi-frequency satellite altimeter snow depth estimates over Arctic sea ice, 2018–2023 egusphere.copernicus.org/preprints/2024… @CIRFA_SFI @UiTNorgesarktis @Bristol_Glac @CPOM_news @DTUcryo @esa_cryosat @NASA_ICE

English

6

20

1.6K

Renée Mie Fredensborg Hansen@rmfredensborg·26 Eyl

@sthendric @dr_slfarrell @esa_cryosat @NASA_ICE @AWI_Media Indeed! Many different aspects to consider, especially for comparing between air- and spaceborne! 🛰 Iceland is treating us well, even though not everyone is here... Hopefully next year, we can all discuss even more radar and laser altimetry consolidation in person!

English

2

57

Stefan Hendricks (@sthendric@fediscience.org)

Stefan Hendricks (@[email protected])@sthendric·26 Eyl

@rmfredensborg @dr_slfarrell @esa_cryosat @NASA_ICE @AWI_Media And for lognormal distributions there might be actually very little actual interfaces at the retracked height. For ground and airborne altimeters this can be a bit different.

English

0

3

84

ESA's CryoSat mission@esa_cryosat·26 Eyl

After a fabulous #Cryo2ice community day of networking and collaboration building, we're back for more sea ice this morning! @HSkourup of @DTUcryo and @rachel_tilling of @NASA_ICE chair this session on snow and summer melt ❄️🌨️☀️🫠

English

3

11

694

Renée Mie Fredensborg Hansen@rmfredensborg·26 Eyl

@dr_slfarrell @esa_cryosat @NASA_ICE And other works using @AWI_Media #ICEBird with low-altitude flights too (ieeexplore.ieee.org/document/93862…) have shown #wavelets to overestimate and primarily capture thicker snow ❄️, so much still to learn with all these different retackers and where to track the interfaces!

English

0

2

77

Dr Sinead L Farrell@dr_slfarrell·26 Eyl

@esa_cryosat @rmfredensborg But beware the retracker! Previous @NASA_ICE #OperationIceBridge work w/ Much smaller footprints obtained by airborne Ku and #SnowRadar has shown that applying other techniques like #Wavelets do better at determining interfaces and retrieving #SnowDepth agupubs.onlinelibrary.wiley.com/doi/full/10.10…

English

0

5

70

Renée Mie Fredensborg Hansen retweetledi

DTU Cryoshere@DTUcryo·14 Haz

We join the 27th IAHR Int. Symp. on Ice in Gdánsk, Poland, this week. @rmfredensborg presented sea ice ridge statistics in Barents Sea and Fram Strait from #ICESat-2! 🛰️ Interesting discussions on deformed ice, offshore ice-ocean-structure, applications of remote sensing! ⛴️🧊❄️

English

10

383

Renée Mie Fredensborg Hansen retweetledi

DTU Cryoshere@DTUcryo·17 May

@hskourup and @rmfredensborg at ESA-ESRIN for the #St3TART-FO kick-off meeting! Exited to continue on the procedures for establishing fiducial reference measurements (#FRMs) for #Sentinel-3 Altimetry Cryo products 🛰, to support validation of altimetry sea ice variables ❄️🧊

English

Renée Mie Fredensborg Hansen@rmfredensborg

2

6

314

Renée Mie Fredensborg Hansen retweetledi

ESA's CryoSat mission@esa_cryosat·7 May

This is just the sort of thing we're looking for at the #Cryo2ice symposium 🤩 "Arctic Freeboard and Snow Depth From Near‐Coincident CryoSat‐2 and ICESat‐2 (CRYO2ICE) Observations: A First Examination of Winter Sea Ice During 2020–2022" 👉agupubs.onlinelibrary.wiley.com/doi/pdf/10.102…

❗️❗️❗️Are you as excited about the upcoming #ESA #CRISTAL mission and estimating snow depth from dual-frequency altimetry along the orbits as us? We've evaluated this possiblity - albeit from laser and radar - from Arctic #CRYO2ICE orbits for 2020-2022! ➡️agupubs.onlinelibrary.wiley.com/doi/full/10.10…

English

1

2

303

Renée Mie Fredensborg Hansen retweetledi

DTU Cryoshere@DTUcryo·28 Nis

Paper celebration day! 📝 We may not be able to share the snacks with you, but we can definitely share our latest papers! Check out the links below if you're looking for some Sunday reading material. Enjoy diving into the research! 📚

English

14

872

Renée Mie Fredensborg Hansen retweetledi

Michel Tsamados@micheltsamados·27 Nis

As a teaser here is the dream team earlier this week on the ice collected amazing in-situ, drone and airborne data. Photo credit: Thomas Newman (@ES_UCL).

English

3

9

653

Renée Mie Fredensborg Hansen@rmfredensborg·20 Nis

@alekpetty Thanks! You let me know if there's anything you want to discuss once you've had a look 😉 🤗

English

27

Alek Petty@alekpetty·19 Nis

@rmfredensborg Congrats, this looks like a really great effort. Excited to read through it!

English

0

1

23

Renée Mie Fredensborg Hansen@rmfredensborg·19 Nis

❗️❗️❗️Are you as excited about the upcoming #ESA #CRISTAL mission and estimating snow depth from dual-frequency altimetry along the orbits as us? We've evaluated this possiblity - albeit from laser and radar - from Arctic #CRYO2ICE orbits for 2020-2022! ➡️agupubs.onlinelibrary.wiley.com/doi/full/10.10…

English