Lars Kaleschke
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seaice.de
Lars Kaleschke
@seaice.de
2.7K followers 970 following 300 posts
Physicist. Climate, sea ice, earth observation @awi.de #Bremen

https://orcid.org/0000-0001-7086-3299
https://det.social/@seaice
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seaice.de
Lars Kaleschke @seaice.de Β· Nov 19
The #Arctic Ocean is full of life, not only polar bears live on the sea ice.
πŸ¦πŸŸπŸ¦πŸ¦πŸ¦πŸ‹πŸ¦
Enjoy this short movie made in the marginal ice zone. 2nd June 2020 ⁦@MOSAiCArctic
Reposted by Lars Kaleschke
alaskawx.bsky.social
AWI’s gain is IARC’s loss
February 10, 2026 at 2:59 PM
Reposted by Lars Kaleschke
awi.de
Prof. Dr Hajo Eicken is the new director of the Alfred Wegener Institute! Born in Bremerhaven, the glaciologist will relocate from Alaska to take up his position as scientific director on 20 March. πŸŽ‰βš“

www.awi.de/en/about-us/...

@helmholtz.de

πŸ“Έ: University of Alaska Fairbanks
Portrait Hajo Eicken
February 10, 2026 at 10:24 AM
seaice.de
www.awi.de/en/about-us/...
Prof. Dr. Hajo Eicken wird neuer Leiter des Alfred-Wegener-Instituts - AWI
On 20 March 2026, the glaciologist will take over as scientific director of the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI). To date, he has been active as the director of the International Arctic Research Center at the University of Alaska in Fairbanks.
www.awi.de
February 10, 2026 at 10:03 AM
Reposted by Lars Kaleschke
melaniebergma18.bsky.social
🧊 1/n Freue mich schon sehr auf die Führung durch die tolle Ausstellung #ColdAsIce in der Weserburg in #Bremen am kommenden Sonntag (15.02.2026 um 11:30 Uhr). Es geht um KÀlte in der Kunst und Gesellschaft.
@awi.de
weserburg.de/veranstaltun...
Γ–ffentliche FΓΌhrungen
Die Weserburg Museum fΓΌr moderne Kunst ist Bremens Haus fΓΌr internationale Kunst der Gegenwart. Wechselnde Einzel- und thematische Gruppenausstellungen sowie eine langfristig angelegte SammlungsprΓ€sen...
weserburg.de
February 9, 2026 at 11:23 AM
Reposted by Lars Kaleschke
scrippsocean.bsky.social
Learn more about EDGE, and join us in congratulating Dr. Fricker and the EDGE team! ‡️
scripps.ucsd.edu/news/uc-san-...
UC San Diego-Led Science Team Selected for NASA Satellite Mission
The Earth Dynamics Geodetic Explorer (EDGE) satellite is one of two next generation satellites selected by NASA to help better understand Earth and improve capabilities to foresee environmental events...
scripps.ucsd.edu
February 6, 2026 at 11:32 PM
seaice.de
dx.doi.org/10.2139/ssrn...
Beyond L-Band: Wideband (0.4–2 GHz) Radiometry for Observing Surface Salinity in Cold Seawater
Sea surface salinity (SSS) is a key variable for understanding ocean circulation, freshwater fluxes, and climate variability. While L-band radiometry (1.4 GHz)
dx.doi.org
February 6, 2026 at 3:07 PM
Reposted by Lars Kaleschke
awi.de
Polarstern will be departing Punta Arenas for the Weddell Sea🚒 Until April, an AWI-led team will study sea ice, ice shelves, and ocean interactions in this key climate region, where summer sea ice has declined since 2017, presumably as a result of warmer surface water.

www.awi.de/en/about-us/...
February 6, 2026 at 1:03 PM
Reposted by Lars Kaleschke
atoffoli.bsky.social
Antarctic sea ice is made of thousands of moving pieces.
New research shows how we can map and measure them from close-range images, even in winter conditions.

dx.doi.org/10.1029/2025...
Sea Ice Floe Segmentation in Close‐Range Optical Imagery Using Active Contour and Foundation Models
Gradient vector flow active contours are compared with the Segment Anything Model to segment sea ice floes in close-range optical imagery The Segment Anything Model guided by prompts provides rob...
dx.doi.org
February 6, 2026 at 11:42 AM
seaice.de
Also nice to see that your maps agree quite well to our sea ice thickness product.

data.marine.copernicus.eu/-/zink2qbge7
Sea ice thickness map from satellites Sea ice thickness map from FMI
February 5, 2026 at 12:33 PM
Reposted by Lars Kaleschke
cpom-uk.bsky.social
πŸ“£ New research by Rachel Tilling examines how different satellites track Arctic sea ice 'leads' and 'floes'. This is crucial for understanding how sea ice is changing seasonally and over the longer-term.

agupubs.onlinelibrary.wiley.com/doi/10.1029/...
Lead and Floe Detection From CryoSat‐2 Radar and ICESat‐2 Laser Altimetry
The CryoSat-2 and ICESat-2 satellite altimeters provide invaluable data for resolving small-scale sea ice features across the Arctic Because CryoSat-2 and ICESat-2 differ in their geometric and r...
agupubs.onlinelibrary.wiley.com
February 5, 2026 at 12:13 PM
Reposted by Lars Kaleschke
signeaaboe.bsky.social
πŸ“’ We are hiring at MET!

Position 1 (location in Tromso or Oslo)
Focus on climate and sea ice remote sensing using passive microwave sensors
πŸ‘‰ www.jobbnorge.no/en/available...

πŸ•’ 2-year position linked to projects with ESA.

Please help spread the word and boost πŸ¦‹β©πŸ“§

#Climate #SeaIce #RemoteSensing
Researcher (294200) | Norwegian Meteorological Institute
Job title: Researcher (294200), Employer: Norwegian Meteorological Institute, Deadline: Monday, February 23, 2026
www.jobbnorge.no
February 5, 2026 at 11:41 AM
seaice.de
Give it a drill to extract ice cores!

youtu.be/SX4WKUHAP4E
World's First: Unitree Humanoid Robot Autonomous Walking Challenge in βˆ’47.4Β°C Extreme Cold
YouTube video by Unitree Robotics
youtu.be
February 4, 2026 at 8:03 PM
Reposted by Lars Kaleschke
seaice.de
New preprint alert!

This manuscript is now open for discussion and under review in Earth Observation (EO).

πŸŒπŸ›°οΈ Bonus: it’s the very first preprint for the new @egu.eu Journal!

egusphere.copernicus.org/preprints/20... @jlbamber.bsky.social @egu-cr.bsky.social
@egu-cl.bsky.social
Self-supervised learning reduces labelling requirements for sea ice segmentation in Sentinel-1 SAR imagery
Abstract. Monitoring Arctic sea ice variability is crucial for maritime safety. Synthetic Aperture Radar (SAR) imagery provides an effective means of achieving this through all-weather, day-and-night ...
egusphere.copernicus.org
February 4, 2026 at 10:15 AM
seaice.de
New preprint alert!

This manuscript is now open for discussion and under review in Earth Observation (EO).

πŸŒπŸ›°οΈ Bonus: it’s the very first preprint for the new @egu.eu Journal!

egusphere.copernicus.org/preprints/20... @jlbamber.bsky.social @egu-cr.bsky.social
@egu-cl.bsky.social
Self-supervised learning reduces labelling requirements for sea ice segmentation in Sentinel-1 SAR imagery
Abstract. Monitoring Arctic sea ice variability is crucial for maritime safety. Synthetic Aperture Radar (SAR) imagery provides an effective means of achieving this through all-weather, day-and-night ...
egusphere.copernicus.org
February 4, 2026 at 10:15 AM
seaice.de
Sea ice formation in the southwestern Baltic Sea near RΓΌgen.

Image source in full resolution: www.polarview.aq/images/105_S...
Synthetic Aperture Radar (SAR) image showing sea ice formation in the southwestern Baltic Sea near RΓΌgen. A rotated satellite swath cuts diagonally across the map, with dark, smooth open water contrasting against brighter, rougher textures of newly formed ice. Thin, grey streaks and bands indicate frazil and grease ice aligned with wind and currents, while brighter bluish, mottled patches mark thicker consolidated ice and floes along the coast and in sheltered bays. Irregular ice edges, fractures, and leads are visible where ice transitions to open water. Red latitude–longitude grid lines overlay the scene, and surrounding land areas appear dark, emphasizing the radar backscatter differences between land, ice, and sea.
February 4, 2026 at 8:33 AM
Reposted by Lars Kaleschke
aederocher.bsky.social
New paper on Svalbard polar bears reveals the complexity of responses to sea ice loss across the Arctic. Svalbard bears are doing OK for now despite having the highest rate of sea ice loss of the 20 populations. A time-limited situation as ice declines.
www.nature.com/articles/s41... [open access]
January 29, 2026 at 8:21 PM
Reposted by Lars Kaleschke
aederocher.bsky.social
www.cbc.ca/news/climate...
Nice overview of the new paper in Scientific Reports.
www.nature.com/articles/s41... [open access paper]
These polar bears are showing surprising resilience in a warming world | CBC Climate Change News
Studying close to 800 bears over nearly 25 years shows that polar bear populations in the rapidly warming Barents Sea, off the northern coasts of Norway and Russia, are doing better than polar bears i...
www.cbc.ca
January 29, 2026 at 8:23 PM
Reposted by Lars Kaleschke
hagolleo.bsky.social
So glad we can finally get rid of Elsevier and MDPI for remote sensing. Thanks EGU and good luck to Earth Observation journal !
January 27, 2026 at 2:10 AM
seaice.de
www.butenunbinnen.de/nachrichten/...
Bremer "Starlink"-Alternative: Macht OHB bald Elon Musk Konkurrenz? - buten un binnen
OHB und Rheinmetall wollen sich gemeinsam um ein Projekt fΓΌr ein unabhΓ€ngiges Kommunikationssystem bewerben. Der OHB-Aktienkurs stieg um 30 Prozent.
www.butenunbinnen.de
January 26, 2026 at 6:20 PM
Reposted by Lars Kaleschke
seaice.de
G. Macelloni et al., "Wideband Radiometry From P to S Band for Monitoring Polar Regions," in Proceedings of the IEEE, doi: 10.1109/JPROC.2026.3653571.

#Microwave #Ocean #Antarctica #Cryosphere
ieeexplore.ieee.org/document/113...
Wideband Radiometry From P to S Band for Monitoring Polar Regions
This article reviews existing and planned contributions of spaceborne microwave radiometry from P to S band to new measurements of key geophysical variables with a particular focus on the polar region...
ieeexplore.ieee.org
January 25, 2026 at 9:32 AM
seaice.de
www.egu.eu/news/472/ann...
January 26, 2026 at 5:32 PM
seaice.de
G. Macelloni et al., "Wideband Radiometry From P to S Band for Monitoring Polar Regions," in Proceedings of the IEEE, doi: 10.1109/JPROC.2026.3653571.

#Microwave #Ocean #Antarctica #Cryosphere
ieeexplore.ieee.org/document/113...
Wideband Radiometry From P to S Band for Monitoring Polar Regions
This article reviews existing and planned contributions of spaceborne microwave radiometry from P to S band to new measurements of key geophysical variables with a particular focus on the polar region...
ieeexplore.ieee.org
January 25, 2026 at 9:32 AM
Reposted by Lars Kaleschke
climatologist49.bsky.social
Absolutely unreal.
January 21, 2026 at 11:05 AM
Reposted by Lars Kaleschke
geogeordie.bsky.social
Our first paper from the 'EPIC' project- 'How will Emperor Penguins Respond to Changing Ice Conditions?'πŸ§β„οΈ - is now out. πŸŽ‰

My first first-author penguin paper🐧! w co-authors @changingice.bsky.social, Chris Stokes, Melanie Marochov, @ptfretwell.bsky.social, Stéphanie Jenouvrier

tinyurl.com/4635pdwh
Response of emperor penguins to 40 years of changing ice conditions at the Astrid, Mertz and SANAE colonies using satellite remote sensing (1984–2024) | Antarctic Science | Cambridge Core
Response of emperor penguins to 40 years of changing ice conditions at the Astrid, Mertz and SANAE colonies using satellite remote sensing (1984–2024)
www.cambridge.org
January 21, 2026 at 10:58 AM
Reposted by Lars Kaleschke
hansonmark.bsky.social
It's not funny, but I do love the use of "one Greenland" as an economic unit
justinwolfers.bsky.social Justin Wolfers @justinwolfers.bsky.social Β· 21d
Some perspective: The S&P opened down -1.3% on Trump's Greenland saber-rattling. That's $750 billion of wealth destroyed -- roughly equal to estimates of the value of Greenland.

And so ~in dollar terms~ his shenanigans have already cost the US one Greenland, and we've got nothing to show for it.
January 20, 2026 at 3:07 PM