Lars Kaleschke
@seaice.de
Physicist. Climate, sea ice, earth observation @awi.de #Bremen
https://orcid.org/0000-0001-7086-3299
https://det.social/@seaice
https://orcid.org/0000-0001-7086-3299
https://det.social/@seaice
Pinned
Lars Kaleschke
@seaice.de
· Nov 19
The #Arctic Ocean is full of life, not only polar bears live on the sea ice.
🐦🐟🐦🦐🐦🐋🐦
Enjoy this short movie made in the marginal ice zone. 2nd June 2020 @MOSAiCArctic
🐦🐟🐦🦐🐦🐋🐦
Enjoy this short movie made in the marginal ice zone. 2nd June 2020 @MOSAiCArctic
Reposted by Lars Kaleschke
Absolutely unreal.
January 21, 2026 at 11:05 AM
Absolutely unreal.
Reposted by Lars Kaleschke
Our first paper from the 'EPIC' project- 'How will Emperor Penguins Respond to Changing Ice Conditions?'🐧❄️ - is now out. 🎉
My first first-author penguin paper🐧! w co-authors @changingice.bsky.social, Chris Stokes, Melanie Marochov, @ptfretwell.bsky.social, Stéphanie Jenouvrier
tinyurl.com/4635pdwh
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
Our first paper from the 'EPIC' project- 'How will Emperor Penguins Respond to Changing Ice Conditions?'🐧❄️ - is now out. 🎉
My first first-author penguin paper🐧! w co-authors @changingice.bsky.social, Chris Stokes, Melanie Marochov, @ptfretwell.bsky.social, Stéphanie Jenouvrier
tinyurl.com/4635pdwh
My first first-author penguin paper🐧! w co-authors @changingice.bsky.social, Chris Stokes, Melanie Marochov, @ptfretwell.bsky.social, Stéphanie Jenouvrier
tinyurl.com/4635pdwh
Reposted by Lars Kaleschke
It's not funny, but I do love the use of "one Greenland" as an economic unit
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.
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
It's not funny, but I do love the use of "one Greenland" as an economic unit
There are reasons why no one has invested so far – it's simply not worth it at the moment. #Greenland
www.zeit.de/wissen/2026-...
www.zeit.de/wissen/2026-...
www.zeit.de
January 20, 2026 at 12:52 PM
There are reasons why no one has invested so far – it's simply not worth it at the moment. #Greenland
www.zeit.de/wissen/2026-...
www.zeit.de/wissen/2026-...
Reposted by Lars Kaleschke
Launch of a brand new @egu.eu journal called Earth Observation. Fully open access, publicly peer reviewed and edited by leading experts in ther field. Check out the scope, editors and options.
www.earth-observation.net/home.html #openaccess #noprofit #earthobservation 🌍🛰️📡🌊🧊
www.earth-observation.net/home.html #openaccess #noprofit #earthobservation 🌍🛰️📡🌊🧊
January 19, 2026 at 5:48 PM
Launch of a brand new @egu.eu journal called Earth Observation. Fully open access, publicly peer reviewed and edited by leading experts in ther field. Check out the scope, editors and options.
www.earth-observation.net/home.html #openaccess #noprofit #earthobservation 🌍🛰️📡🌊🧊
www.earth-observation.net/home.html #openaccess #noprofit #earthobservation 🌍🛰️📡🌊🧊
Reposted by Lars Kaleschke
The Director of the German Climate Computing Centre (www.dkrz.de) is a joint appointment with University of Hamburg and leads the central facility for climate computing, being enlarged to also be a central climate data facility. A crucial thing for German climate science. Closing date: 17 Feb 2026
DKRZ - Partner der Klimaforschung
www.dkrz.de
January 20, 2026 at 7:09 AM
The Director of the German Climate Computing Centre (www.dkrz.de) is a joint appointment with University of Hamburg and leads the central facility for climate computing, being enlarged to also be a central climate data facility. A crucial thing for German climate science. Closing date: 17 Feb 2026
Reposted by Lars Kaleschke
Currently 2 important positions in German climate/atmospheric science are advertised: Director of the Leibniz-Institute for Tropospheric Research (www.uni-leipzig.de/en/universit...) and Director of the German Climate Computing Centre (DKRZ, www.uni-hamburg.de/en/stellenan...)
Home - Leibniz-Institut für Troposphärenforschung e.V. (TROPOS)
Das Leibniz-Institut für Troposphärenforschung besitzt ein klares und weltweit einzigartiges Forschungsprofil, in dessen Mittelpunkt Aerosole, also kleinste luftgetragene Partikel, und Wolken stehen.
www.tropos.de
January 20, 2026 at 7:07 AM
Currently 2 important positions in German climate/atmospheric science are advertised: Director of the Leibniz-Institute for Tropospheric Research (www.uni-leipzig.de/en/universit...) and Director of the German Climate Computing Centre (DKRZ, www.uni-hamburg.de/en/stellenan...)
Reposted by Lars Kaleschke
Watch this video of @milesobrien.com from a Korean Icebreaker in Antarctica. Glad he mentioned that the US no longer has this capability because of the Trump regime.
There are also two @nytimes.com reporters on the same ship. 🌊
There are also two @nytimes.com reporters on the same ship. 🌊
Scientists are worried about the melting of Antarctica's ice sheets and what it could mean for sea levels. There's a two-month-long journey underway to conduct research that will better explain what's happening. https://to.pbs.org/45WdVPh
On board the voyage to Antarctica to learn why a massive glacier is melting
Scientists are worried about the melting of Antarctica's ice sheets and what it could mean for sea levels. There's a two-month-long journey underway to conduct research that will better explain what's...
to.pbs.org
January 20, 2026 at 7:04 AM
Watch this video of @milesobrien.com from a Korean Icebreaker in Antarctica. Glad he mentioned that the US no longer has this capability because of the Trump regime.
There are also two @nytimes.com reporters on the same ship. 🌊
There are also two @nytimes.com reporters on the same ship. 🌊
The film #Greenland, the Earth's Thrills will air on Ushuaia TV on Tuesday, January 27th at 8:50 pm. This original documentary recounts Vagabond's latest mission: a 3-year project in the Narsaq region, supported by the French Polar Institute (IPEV).
ushuaiatv.fr/actualit%C3%... #french
ushuaiatv.fr/actualit%C3%... #french
Groenland, les frissons de la Terre | Ushuaia TV
Disponible en streaming jusqu'au 28 mars
https://ushuaiatv.fr/actualités/groenland-les-frissons-de-la-terre
January 20, 2026 at 7:04 AM
The film #Greenland, the Earth's Thrills will air on Ushuaia TV on Tuesday, January 27th at 8:50 pm. This original documentary recounts Vagabond's latest mission: a 3-year project in the Narsaq region, supported by the French Polar Institute (IPEV).
ushuaiatv.fr/actualit%C3%... #french
ushuaiatv.fr/actualit%C3%... #french
Reposted by Lars Kaleschke
In der Mythologie des Nordatlantiks bedeuten Nordlichter, dass man Grönland in Ruhe lassen soll.
January 19, 2026 at 11:02 PM
In der Mythologie des Nordatlantiks bedeuten Nordlichter, dass man Grönland in Ruhe lassen soll.
Reposted by Lars Kaleschke
Aurora Forecast Update for 2026-01-19T19:50:03Z
ALERT: Geomagnetic K-index of 8, 9-
Threshold Reached: 2026 Jan 19 1938 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G4 - Severe
Additional Details Here.
ALERT: Geomagnetic K-index of 8, 9-
Threshold Reached: 2026 Jan 19 1938 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G4 - Severe
Additional Details Here.
January 19, 2026 at 7:50 PM
Aurora Forecast Update for 2026-01-19T19:50:03Z
ALERT: Geomagnetic K-index of 8, 9-
Threshold Reached: 2026 Jan 19 1938 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G4 - Severe
Additional Details Here.
ALERT: Geomagnetic K-index of 8, 9-
Threshold Reached: 2026 Jan 19 1938 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G4 - Severe
Additional Details Here.
Reposted by Lars Kaleschke
Huge, Earth-directed coronal mass ejection now en route. Geomagnetic Storm Watch (G4-level) in effect.
"Watches at this level are very rare," says NOAA.
Could be substantial aurora displays on Mon night 1/19-1/20, even as far south as NoCal > Alabama.
www.swpc.noaa.gov/news/g4-seve...
"Watches at this level are very rare," says NOAA.
Could be substantial aurora displays on Mon night 1/19-1/20, even as far south as NoCal > Alabama.
www.swpc.noaa.gov/news/g4-seve...
January 19, 2026 at 5:23 PM
Huge, Earth-directed coronal mass ejection now en route. Geomagnetic Storm Watch (G4-level) in effect.
"Watches at this level are very rare," says NOAA.
Could be substantial aurora displays on Mon night 1/19-1/20, even as far south as NoCal > Alabama.
www.swpc.noaa.gov/news/g4-seve...
"Watches at this level are very rare," says NOAA.
Could be substantial aurora displays on Mon night 1/19-1/20, even as far south as NoCal > Alabama.
www.swpc.noaa.gov/news/g4-seve...
Launch of a brand new @egu.eu journal called Earth Observation. Fully open access, publicly peer reviewed and edited by leading experts in ther field. Check out the scope, editors and options.
www.earth-observation.net/home.html #openaccess #noprofit #earthobservation 🌍🛰️📡🌊🧊
www.earth-observation.net/home.html #openaccess #noprofit #earthobservation 🌍🛰️📡🌊🧊
January 19, 2026 at 5:48 PM
Launch of a brand new @egu.eu journal called Earth Observation. Fully open access, publicly peer reviewed and edited by leading experts in ther field. Check out the scope, editors and options.
www.earth-observation.net/home.html #openaccess #noprofit #earthobservation 🌍🛰️📡🌊🧊
www.earth-observation.net/home.html #openaccess #noprofit #earthobservation 🌍🛰️📡🌊🧊
Reposted by Lars Kaleschke
Kalaallit Nunaat Kalaallit pigaat
(Greenland is the property of the Greenlanders)
(Greenland is the property of the Greenlanders)
January 18, 2026 at 11:12 AM
Kalaallit Nunaat Kalaallit pigaat
(Greenland is the property of the Greenlanders)
(Greenland is the property of the Greenlanders)
New preprint:
Ludwig, V.,et al.: Biases, Uncertainties, and Trends in Arctic Sea-Ice Thickness: A Cross-Product Analysis from 1995 to 2023, EGUsphere [preprint], doi.org/10.5194/egus..., 2026.
Ludwig, V.,et al.: Biases, Uncertainties, and Trends in Arctic Sea-Ice Thickness: A Cross-Product Analysis from 1995 to 2023, EGUsphere [preprint], doi.org/10.5194/egus..., 2026.
Biases, Uncertainties, and Trends in Arctic Sea-Ice Thickness: A Cross-Product Analysis from 1995 to 2023
Abstract. Sea-ice thickness is a key component of the Arctic climate system, but yet a comprehensive assessment across observations and numerical models is still missing. Previous studies have either ...
doi.org
January 13, 2026 at 7:12 PM
New preprint:
Ludwig, V.,et al.: Biases, Uncertainties, and Trends in Arctic Sea-Ice Thickness: A Cross-Product Analysis from 1995 to 2023, EGUsphere [preprint], doi.org/10.5194/egus..., 2026.
Ludwig, V.,et al.: Biases, Uncertainties, and Trends in Arctic Sea-Ice Thickness: A Cross-Product Analysis from 1995 to 2023, EGUsphere [preprint], doi.org/10.5194/egus..., 2026.
Reposted by Lars Kaleschke
🚨 CALL for Community Input 🚨
The #AntarcticaInSync Draft White Papers are open for review—and your voice matters!
⏳ Feedback closes 31 Jan 2026
🎥 Public webinar: 20–21 Jan 2026
This is a critical opportunity to influence priorities, gaps, & directions.
www.antarctica-insync.org/antarctica-i...
The #AntarcticaInSync Draft White Papers are open for review—and your voice matters!
⏳ Feedback closes 31 Jan 2026
🎥 Public webinar: 20–21 Jan 2026
This is a critical opportunity to influence priorities, gaps, & directions.
www.antarctica-insync.org/antarctica-i...
January 13, 2026 at 4:51 AM
🚨 CALL for Community Input 🚨
The #AntarcticaInSync Draft White Papers are open for review—and your voice matters!
⏳ Feedback closes 31 Jan 2026
🎥 Public webinar: 20–21 Jan 2026
This is a critical opportunity to influence priorities, gaps, & directions.
www.antarctica-insync.org/antarctica-i...
The #AntarcticaInSync Draft White Papers are open for review—and your voice matters!
⏳ Feedback closes 31 Jan 2026
🎥 Public webinar: 20–21 Jan 2026
This is a critical opportunity to influence priorities, gaps, & directions.
www.antarctica-insync.org/antarctica-i...
Reposted by Lars Kaleschke
Navigating Health and Community in Germany as a Returned Immigrant: Trains, Sport, and Food
I emigrated in 1987 to the United States of America leaving Germany in 1985 to study oceanography in the United Kingdom. After graduate school, marriage, kids, U.S. citizenship, career, and finally…
I emigrated in 1987 to the United States of America leaving Germany in 1985 to study oceanography in the United Kingdom. After graduate school, marriage, kids, U.S. citizenship, career, and finally…
Navigating Health and Community in Germany as a Returned Immigrant: Trains, Sport, and Food
I emigrated in 1987 to the United States of America leaving Germany in 1985 to study oceanography in the United Kingdom. After graduate school, marriage, kids, U.S. citizenship, career, and finally retirement I arrived again in Germany, again as an immigrant, but now to the country where I was born. Renting a 2-bedroom appartment in the port city of Bremerhaven near the North Sea, I just received a 2-year residence permit.
icyseas.org
January 10, 2026 at 4:19 PM
Navigating Health and Community in Germany as a Returned Immigrant: Trains, Sport, and Food
I emigrated in 1987 to the United States of America leaving Germany in 1985 to study oceanography in the United Kingdom. After graduate school, marriage, kids, U.S. citizenship, career, and finally…
I emigrated in 1987 to the United States of America leaving Germany in 1985 to study oceanography in the United Kingdom. After graduate school, marriage, kids, U.S. citizenship, career, and finally…
Reposted by Lars Kaleschke
During the return journey of an Antarctic expedition in the Bellingshausen Sea geoscientist Johann Klages threw a message in a bottle into the water. He has now received an email from Tasmania: Toby Ray found the bottle on the west coast of Tasmania - it has travelled around two-thirds of Antarctica
December 19, 2025 at 12:32 PM
During the return journey of an Antarctic expedition in the Bellingshausen Sea geoscientist Johann Klages threw a message in a bottle into the water. He has now received an email from Tasmania: Toby Ray found the bottle on the west coast of Tasmania - it has travelled around two-thirds of Antarctica
Reposted by Lars Kaleschke
Türchen 19: Drei Wochen, dreimal in „Region 3" gemessen – ein Meilenstein!
Zum zweiten Mal überfliegt #Polar 6 (von Station Nord auf Grönland) die #Polarstern. Messungen aus der Luft lassen sich mit unseren Daten verknüpfen. Wir sind auf dem Weg nach Osten. Jetzt heißt es Endspurt. #CONTRASTSXMAS
Zum zweiten Mal überfliegt #Polar 6 (von Station Nord auf Grönland) die #Polarstern. Messungen aus der Luft lassen sich mit unseren Daten verknüpfen. Wir sind auf dem Weg nach Osten. Jetzt heißt es Endspurt. #CONTRASTSXMAS
December 19, 2025 at 10:39 AM
Türchen 19: Drei Wochen, dreimal in „Region 3" gemessen – ein Meilenstein!
Zum zweiten Mal überfliegt #Polar 6 (von Station Nord auf Grönland) die #Polarstern. Messungen aus der Luft lassen sich mit unseren Daten verknüpfen. Wir sind auf dem Weg nach Osten. Jetzt heißt es Endspurt. #CONTRASTSXMAS
Zum zweiten Mal überfliegt #Polar 6 (von Station Nord auf Grönland) die #Polarstern. Messungen aus der Luft lassen sich mit unseren Daten verknüpfen. Wir sind auf dem Weg nach Osten. Jetzt heißt es Endspurt. #CONTRASTSXMAS
Reposted by Lars Kaleschke
Attacking NCAR is enormously self-destructive for America. NCAR is the leading centre in weather and climate research in the world. We Europeans often travel to NCAR to collaborate, discuss and learn. Hurting the centre will cause damage that is irreversible for years to decades with global impact.
To help #SaveNCAR, read our update below and visit this @aguscipolicy.bsky.social page, where you can find email text and a call script to share with your representatives. agu.quorum.us/campaign/151...
December 18, 2025 at 8:23 AM
Attacking NCAR is enormously self-destructive for America. NCAR is the leading centre in weather and climate research in the world. We Europeans often travel to NCAR to collaborate, discuss and learn. Hurting the centre will cause damage that is irreversible for years to decades with global impact.
Reposted by Lars Kaleschke
Beyond fucked up…
Exclusive: The Trump administration is moving to dismantle the National Center for Atmospheric Research in Colorado, according to a senior White House official, taking aim at one of the world's leading climate research labs.
Trump moves to dismantle major US climate research center in Colorado
The Trump administration is breaking up the National Center for Atmospheric Research, taking aim at one of the world's leading climate research labs.
bit.ly
December 17, 2025 at 2:54 AM
Beyond fucked up…
Reposted by Lars Kaleschke
Oh no... Seeing the direct tweet is even more frightening. Every day is a new crisis, and the repercussions are unimaginable.
An absolute bedrock institution for understanding how the planet works, just civilization-scaled vandalism by the most incurious morons on Earth
December 17, 2025 at 2:56 AM
Oh no... Seeing the direct tweet is even more frightening. Every day is a new crisis, and the repercussions are unimaginable.
Reposted by Lars Kaleschke
We’ve got a piece in The Conversation about the 2025 Arctic Report Card and the implications of 20 years of tracking rapid Arctic change. #Arctic #akwx #Climate
theconversation.com/from-record-...
theconversation.com/from-record-...
From record warming to rusting rivers, 2025 Arctic Report Card shows a region transforming faster than expected
The 20th anniversary of the annual report tracks how sea ice, snow cover and many other vital signs of the Arctic have changed, and the impact that’s having on people and wildlife.
theconversation.com
December 16, 2025 at 9:22 PM
We’ve got a piece in The Conversation about the 2025 Arctic Report Card and the implications of 20 years of tracking rapid Arctic change. #Arctic #akwx #Climate
theconversation.com/from-record-...
theconversation.com/from-record-...
Reposted by Lars Kaleschke
The 2025 #Arctic Report Card is out! #AGU25 🧪🌊🦑🐻❄️
Check out the executive summary by the editors M.L. Drunkenmiller, R.L. Thoman, and T.A. Moon. @alaskawx.bsky.social
arctic.noaa.gov/report-card/...
Check out the executive summary by the editors M.L. Drunkenmiller, R.L. Thoman, and T.A. Moon. @alaskawx.bsky.social
arctic.noaa.gov/report-card/...
Executive Summary - NOAA Arctic
DOI: 10.25923/nrzf-j897 M. L. Druckenmiller1, R. L. Thoman2,3, and T. A. Moon1 1National Snow and Ice Data Center, Cooperative Institute for Research in Environmental Sciences, University of Colorado ...
arctic.noaa.gov
December 16, 2025 at 7:36 PM
The 2025 #Arctic Report Card is out! #AGU25 🧪🌊🦑🐻❄️
Check out the executive summary by the editors M.L. Drunkenmiller, R.L. Thoman, and T.A. Moon. @alaskawx.bsky.social
arctic.noaa.gov/report-card/...
Check out the executive summary by the editors M.L. Drunkenmiller, R.L. Thoman, and T.A. Moon. @alaskawx.bsky.social
arctic.noaa.gov/report-card/...
Reposted by Lars Kaleschke
The 2025 Arctic Report Card is out. This is the 20th annual edition, having been issued every year since 2006. Highlights of this year’s report in the latest from the Alaska and Arctic Climate Newsletter. #Arctic #Climate #akwx @climatologist49.bsky.social
alaskaclimate.substack.com/p/arctic-rep...
alaskaclimate.substack.com/p/arctic-rep...
December 16, 2025 at 7:16 PM
The 2025 Arctic Report Card is out. This is the 20th annual edition, having been issued every year since 2006. Highlights of this year’s report in the latest from the Alaska and Arctic Climate Newsletter. #Arctic #Climate #akwx @climatologist49.bsky.social
alaskaclimate.substack.com/p/arctic-rep...
alaskaclimate.substack.com/p/arctic-rep...