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
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...
Reposted by Lars Kaleschke
This photo was taken during our #fieldwork in #Qaanaaq this year, which saw the earliest break up in our record of sea ice. The melting of the Greenland ice sheet has a global impact, but there are big local impacts too.
Full details of this year's melt season in @carbonbrief.org now
Full details of this year's melt season in @carbonbrief.org now
Finally, here it is. Also this year, I have together with @ruthmottram.bsky.social commented on the fate of the Greenland Ice Sheet. Thanks for your patience, @carbonbrief.org. One of the highlights: 2024/25 was the 29th year in a row with net mass loss. See www.carbonbrief.org/guest-post-h...
Guest post: How the Greenland ice sheet fared in 2025 - Carbon Brief
Guest authors explore how Greenland’s ice sheets fared over the 12 months, including the evidence that the territory’s summer melting season is lengthening.
www.carbonbrief.org
December 16, 2025 at 4:04 PM
This photo was taken during our #fieldwork in #Qaanaaq this year, which saw the earliest break up in our record of sea ice. The melting of the Greenland ice sheet has a global impact, but there are big local impacts too.
Full details of this year's melt season in @carbonbrief.org now
Full details of this year's melt season in @carbonbrief.org now
Reposted by Lars Kaleschke
An important new paper for all involved with #Arctic sea ice research
- highlighting indigenous #seaice knowledge and needs for co-production
- highlighting indigenous #seaice knowledge and needs for co-production
new publication
Co-production of Arctic sea ice knowledge: A systematic review
Open access link: link.springer.com/article/10.1...
Co-production of Arctic sea ice knowledge: A systematic review
Open access link: link.springer.com/article/10.1...
Co-production of Arctic sea ice knowledge: A systematic review - Ambio
Arctic sea ice is a vital component of the global climate system and a key indicator of climate change. Collaborations between Western scientists and Indigenous Knowledge holders advance understanding...
link.springer.com
December 15, 2025 at 11:17 AM
Reposted by Lars Kaleschke
Our icebreaker Polarstern sets off today from Namibia toward Antarctica. The research expedition to the Antarctic Weddell Sea will conduct long-term studies of Antarctic biodiversity.
www.awi.de/en/about-us/...
Photo: Tim Kalvelage
www.awi.de/en/about-us/...
Photo: Tim Kalvelage
December 15, 2025 at 12:14 PM
Our icebreaker Polarstern sets off today from Namibia toward Antarctica. The research expedition to the Antarctic Weddell Sea will conduct long-term studies of Antarctic biodiversity.
www.awi.de/en/about-us/...
Photo: Tim Kalvelage
www.awi.de/en/about-us/...
Photo: Tim Kalvelage
Reposted by Lars Kaleschke
Das geht gerade alles in die richtige Richtung beim AfD #Verbotsverfahren, die Länder machen sich auf den Weg. Und das ist gut so. #AfDVerbot
www.butenunbinnen.de/nachrichten/...
www.butenunbinnen.de/nachrichten/...
Neue Bremer Innensenatorin für AfD-Verbotsverfahren - buten un binnen
Damit unterscheidet sich Högl direkt zum Amtsantritt von ihrem Vorgänger Ulrich Mäurer. Högl bezeichnet die Lage so ernst, wie seit dem Zweiten Weltkrieg nicht mehr.
www.butenunbinnen.de
December 12, 2025 at 5:06 PM
Das geht gerade alles in die richtige Richtung beim AfD #Verbotsverfahren, die Länder machen sich auf den Weg. Und das ist gut so. #AfDVerbot
www.butenunbinnen.de/nachrichten/...
www.butenunbinnen.de/nachrichten/...
Reposted by Lars Kaleschke
🌊
#GEOMARJobs
🌊 Ship Coordinator (f/m/d) permanent - full-time
🌊 Scientific researcher (m/f/d) on satellite remote
sensing of marine/ocean phytoplankton
🌊 Zwei Ausbildungsplätze zum:zur Chemielaborant:in
🔗 www.geomar.de/en/karriere/...
🌊 Ship Coordinator (f/m/d) permanent - full-time
🌊 Scientific researcher (m/f/d) on satellite remote
sensing of marine/ocean phytoplankton
🌊 Zwei Ausbildungsplätze zum:zur Chemielaborant:in
🔗 www.geomar.de/en/karriere/...
December 12, 2025 at 4:53 PM
🌊
Reposted by Lars Kaleschke
New paper about Russian subversive activities on Svalbard after 2014 is published by the European Centre of Excellence for Countering Hybrid Threats (Hybrid CoE). Written by the two UiT professors @kariagam.bsky.social &
@stianbones.bsky.social and Barents Observer editor @thomasnilsen.bsky.social
@stianbones.bsky.social and Barents Observer editor @thomasnilsen.bsky.social
Hybrid threats in high latitudes: Facing Russia on Svalbard
This Hybrid CoE Paper outlines how Moscow blends information campaigns, coercive signalling at sea, symbolic gestures and surprise visits to challenge Norwegian authority while remaining below the thr...
www.hybridcoe.fi
December 12, 2025 at 7:44 AM
New paper about Russian subversive activities on Svalbard after 2014 is published by the European Centre of Excellence for Countering Hybrid Threats (Hybrid CoE). Written by the two UiT professors @kariagam.bsky.social &
@stianbones.bsky.social and Barents Observer editor @thomasnilsen.bsky.social
@stianbones.bsky.social and Barents Observer editor @thomasnilsen.bsky.social
Reposted by Lars Kaleschke
#Bremen: Neue Innensenatorin #Högl unterstützt AfD-Verbotsverfahren
www.weser-kurier.de/bremen/polit...
"Ich bin dafür, alles zu unternehmen, um einen solchen Antrag beim Bundesverfassungsgericht einzureichen."
www.weser-kurier.de/bremen/polit...
"Ich bin dafür, alles zu unternehmen, um einen solchen Antrag beim Bundesverfassungsgericht einzureichen."
Neue Bremer Innensenatorin: Eva Högl unterstützt AfD-Verbotsverfahren
Die Bremische Bürgerschaft war im Mai der erste deutsche Landtag, der ein AfD-Verbotsverfahren forderte. Die neue Innensenatorin Eva Högl (SPD) hat sich am Donnerstag klar zu diesem politischen Ziel b...
www.weser-kurier.de
December 11, 2025 at 8:05 PM
#Bremen: Neue Innensenatorin #Högl unterstützt AfD-Verbotsverfahren
www.weser-kurier.de/bremen/polit...
"Ich bin dafür, alles zu unternehmen, um einen solchen Antrag beim Bundesverfassungsgericht einzureichen."
www.weser-kurier.de/bremen/polit...
"Ich bin dafür, alles zu unternehmen, um einen solchen Antrag beim Bundesverfassungsgericht einzureichen."
Reposted by Lars Kaleschke
"climate science"
According to a new court filing, the Trump administration has a six-page list of banned words that Head Start locations are forbidden from using when describing their programs.
Among the censored words: "disability," "race," "women," "trauma," "Gulf of Mexico." Short thread with the full list. 🧵
Among the censored words: "disability," "race," "women," "trauma," "Gulf of Mexico." Short thread with the full list. 🧵
December 11, 2025 at 1:41 AM
"climate science"
New PhD Opportunity in Ocean dynamics and climate impacts from high-resolution models and observations! A fully funded 4-year PhD position is now open at the Delft University of Technology in collaboration with the Alfred Wegener Institute.
careers.tudelft.nl/job/Delft-Ph...
careers.tudelft.nl/job/Delft-Ph...
PhD Position in Ocean Dynamics and Climate Impacts from High-Resolution Models and Observations
PhD Position in Ocean Dynamics and Climate Impacts from High-Resolution Models and Observations
careers.tudelft.nl
December 11, 2025 at 10:16 AM
New PhD Opportunity in Ocean dynamics and climate impacts from high-resolution models and observations! A fully funded 4-year PhD position is now open at the Delft University of Technology in collaboration with the Alfred Wegener Institute.
careers.tudelft.nl/job/Delft-Ph...
careers.tudelft.nl/job/Delft-Ph...
Reposted by Lars Kaleschke
"EPA erases references to human-caused climate change from websites"
"The agency modified sections of its website by deleting information about human-created greenhouse gases and the role they play in warming the planet. It also removed links to scientific data and information."
"The agency modified sections of its website by deleting information about human-created greenhouse gases and the role they play in warming the planet. It also removed links to scientific data and information."
EPA erases references to human-caused climate change from websites
The agency revamped its webpages to feature natural causes of rising temperatures such as the Earth’s orbit.
www.eenews.net
December 9, 2025 at 2:52 PM
"EPA erases references to human-caused climate change from websites"
"The agency modified sections of its website by deleting information about human-created greenhouse gases and the role they play in warming the planet. It also removed links to scientific data and information."
"The agency modified sections of its website by deleting information about human-created greenhouse gases and the role they play in warming the planet. It also removed links to scientific data and information."
Reposted by Lars Kaleschke
And now a look at December temperatures in the #Antarctic when averaged by decade...
Data from @copernicusecmwf.bsky.social ERA5 reanalysis.
Data from @copernicusecmwf.bsky.social ERA5 reanalysis.
December 5, 2025 at 1:21 PM
And now a look at December temperatures in the #Antarctic when averaged by decade...
Data from @copernicusecmwf.bsky.social ERA5 reanalysis.
Data from @copernicusecmwf.bsky.social ERA5 reanalysis.
Reposted by Lars Kaleschke
Our friends and @oceaniceeu.bsky.social collaborators in #Ukraine are featured in this documentary (that looks wonderful, alas this is only the trailer) about their work in #Antarctica. (Enable auto-translate on sub titles to appreciate in full).
youtu.be/eG5xYx11hh8?...
youtu.be/eG5xYx11hh8?...
Антарктида - офіційний трейлер (український)
YouTube video by planetakino
youtu.be
December 5, 2025 at 9:18 AM
Our friends and @oceaniceeu.bsky.social collaborators in #Ukraine are featured in this documentary (that looks wonderful, alas this is only the trailer) about their work in #Antarctica. (Enable auto-translate on sub titles to appreciate in full).
youtu.be/eG5xYx11hh8?...
youtu.be/eG5xYx11hh8?...
Reposted by Lars Kaleschke
Una webcam in diretta dal Mare di Ross! A questo link le immagini dalla rompighiaccio italiana Laura Bassi, impegnata nella spedizione del Programma Nazionale di Ricerche in Antartide
laurabassi.ogs.it/lb_snapshot....
laurabassi.ogs.it/lb_snapshot....
December 4, 2025 at 11:29 AM
Una webcam in diretta dal Mare di Ross! A questo link le immagini dalla rompighiaccio italiana Laura Bassi, impegnata nella spedizione del Programma Nazionale di Ricerche in Antartide
laurabassi.ogs.it/lb_snapshot....
laurabassi.ogs.it/lb_snapshot....
Reposted by Lars Kaleschke
Türchen 3: Da ist es – unser erstes #Meereis!
Am 6. Juli um 9:00 Uhr Bordzeit haben wir unsere erste Eisscholle aus dem Weg geschoben. Nun kann unsere eigentliche Arbeit beginnen. Unsere ersten Messungen zeigen: das Meereis ist zwischen 0,90 und 1,20 m dick.
Auf geht’s zu Station 1! #CONTRASTSXMAS
Am 6. Juli um 9:00 Uhr Bordzeit haben wir unsere erste Eisscholle aus dem Weg geschoben. Nun kann unsere eigentliche Arbeit beginnen. Unsere ersten Messungen zeigen: das Meereis ist zwischen 0,90 und 1,20 m dick.
Auf geht’s zu Station 1! #CONTRASTSXMAS
December 3, 2025 at 9:35 AM
Türchen 3: Da ist es – unser erstes #Meereis!
Am 6. Juli um 9:00 Uhr Bordzeit haben wir unsere erste Eisscholle aus dem Weg geschoben. Nun kann unsere eigentliche Arbeit beginnen. Unsere ersten Messungen zeigen: das Meereis ist zwischen 0,90 und 1,20 m dick.
Auf geht’s zu Station 1! #CONTRASTSXMAS
Am 6. Juli um 9:00 Uhr Bordzeit haben wir unsere erste Eisscholle aus dem Weg geschoben. Nun kann unsere eigentliche Arbeit beginnen. Unsere ersten Messungen zeigen: das Meereis ist zwischen 0,90 und 1,20 m dick.
Auf geht’s zu Station 1! #CONTRASTSXMAS
Reposted by Lars Kaleschke
Huge fractures opening at the Thwaites Glacier Eastern Ice Shelf grounding line
December 2, 2025 at 7:58 AM
Huge fractures opening at the Thwaites Glacier Eastern Ice Shelf grounding line
Reposted by Lars Kaleschke
The study, led by Dr Ariaan Purich (SAEF/Monash) with collaborators from across Australia’s climate and Antarctic science communities, finds that if greenhouse gas emissions continue to rise, this positive state is expected to persist through the 21st century.
December 2, 2025 at 5:01 AM
The study, led by Dr Ariaan Purich (SAEF/Monash) with collaborators from across Australia’s climate and Antarctic science communities, finds that if greenhouse gas emissions continue to rise, this positive state is expected to persist through the 21st century.