Lars Kaleschke
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seaice.de
Lars Kaleschke
@seaice.de
2.7K followers 940 following 270 posts
Physicist. Climate, sea ice, earth observation @awi.de

https://orcid.org/0000-0001-7086-3299
https://det.social/@seaice
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seaice.de
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
seaice.de
Call for Abstracts for the Arctic System Science Conference 2026 is now open, with a deadline of 12 January 2026.
polarsystemscience.org/arcticsystem... #Arctic #Climate
Arctic System Science Conference 2026
Arctic System Science Conference 2026 - General Information, Program, Abstracts, Registration, Facility.
polarsystemscience.org
November 21, 2025 at 3:24 PM
seaice.de
Just published

Hossan, A. et al.: Evaluation of wet snow dielectric mixing models for L-band radiometric measurement of liquid water content in Greenland's percolation zone, The Cryosphere, 19, 6077–6102, doi.org/10.5194/tc-1..., 2025.
Evaluation of wet snow dielectric mixing models for L-band radiometric measurement of liquid water content in Greenland's percolation zone
Abstract. The effective permittivity of wet snow and firn links the snow microphysics to its radiometric signature, making it essential for accurately estimating the liquid water amount (LWA) in the s...
doi.org
November 21, 2025 at 1:56 PM
Reposted by Lars Kaleschke
awi.de
AWI biologist Simeon Lisovski is currently travelling to the Danger Islands in Antarctica with the Team Malizia sailing crew. There, he will study a colony of over 750,000 Adélie penguins. 🐧🇦🇶
November 20, 2025 at 1:14 PM
Reposted by Lars Kaleschke
de.esa.int
Unsere nächste Ministerratskonferenz findet am 26. und 27. November in Bremen statt. Wichtige Entscheidungen über Europas Zukunft in der Raumfahrt werden getroffen.

Schaut euch unsere spezielle #CM25-Website an: 👇

🔗 www.esa.int/About_Us/Min...
esa.int European Space Agency @esa.int · 4d
Our next Ministerial Council will take place on 26-27 November, in Bremen, Germany. Vital decisions will be made on Europe's future in space.

Check out our dedicated #CM25 website 👇
🔗 www.esa.int/About_Us/Min...
November 18, 2025 at 10:10 AM
Reposted by Lars Kaleschke
operations.esa.int
We hear you, #CopernicusEU Sentinel-6B! The Inuvik Satellite Station in Canada has received the first signals from the satellite. The orbit has been reached, and telemetry has begun to arrive at ESA's mission control in Germany!
esa.int European Space Agency @esa.int · 5d
Mission confirmed ✅

#CopernicusEU Sentinel-6B is now in orbit and ready to begin its Launch & Early Operations phase with @operations.esa.int. The satellite is ready to continue a decades-long mission to track the height of the planet’s seas – a key measure of climate change.
Sentinel-6B launched to extend record of sea-level rise
The latest guardian of our oceans has taken its place in orbit. The Copernicus Sentinel-6B satellite is now circling Earth, ready to continue a decades-long mission to track the height of the planet’s...
esa.int
November 17, 2025 at 8:10 AM
Reposted by Lars Kaleschke
leonsimons.bsky.social
Now Live!:
Climate Chat: 'Doomsday Glacier' Update
www.youtube.com/live/iarx9Pi...
November 16, 2025 at 6:03 PM
Reposted by Lars Kaleschke
christianstoecker.de
Umso erstaunlicher, dass die SPD (federführend: Nina Scheer) diese Woche ein sensationelles Gesetz durch den Bundestag geschleust hat, das tatsächlich in die (energetische) Zukunft weist.
Meinung: Wasserstoff, Atomkraft, Kernfusion: Politische Nebelkerzen schaden nur – aber es gibt Hoffnung
Markus Söders Vorstoß für Mini-AKWs zeigt: Nebelkerzen sind bei bürgerlichen Parteien beliebt. Das gilt auch für Wasserstoff-Pkw oder E-Fuels. Kaum zu glauben, dass die Union nun eine tatsächliche Technikrevolution mitbeschlossen hat.
www.spiegel.de
November 16, 2025 at 3:35 PM
Reposted by Lars Kaleschke
cerlin.bsky.social
Je 5 Erkenntnisse aus 5 aktuellen Studien:
• "Global Carbon Budget"
• "Climate Action Tracker" @newclimate.bsky.social/@climateanalytics.org
• "State of the Climate Report"
• "World Energy Outlook" @iea.org
• China-Analyse @carbonbrief.org/@laurimyllyvirta.bsky.social
(v. @elenae.bsky.social & me)
zeit.de DIE ZEIT @zeit.de · 8d
Mehr CO₂ als je zuvor, stromfressende KI und China: Neue Reports zeigen, wohin die Welt sich bewegt. Die wichtigsten Erkenntnisse – damit Sie nicht alles lesen müssen.
Klimakrise: Wie steht’s denn nun wirklich ums Klima?
Mehr CO₂ als je zuvor, stromfressende KI und China: Neue Reports zeigen, wohin die Welt sich bewegt. Die wichtigsten Erkenntnisse – damit Sie nicht alles lesen müssen.
www.zeit.de
November 14, 2025 at 8:28 AM
Reposted by Lars Kaleschke
hansonmark.bsky.social
We wrote the Strain on scientific publishing to highlight the problems of time & trust. With a fantastic group of co-authors, we present The Drain of Scientific Publishing:

a 🧵 1/n

Drain: arxiv.org/abs/2511.04820
Strain: direct.mit.edu/qss/article/...
Oligopoly: direct.mit.edu/qss/article/...
A table showing profit margins of major publishers. A snippet of text related to this table is below. 1. The four-fold drain 1.1 Money Currently, academic publishing is dominated by profit-oriented, multinational companies for whom scientific knowledge is a commodity to be sold back to the academic community who created it. The dominant four are Elsevier, Springer Nature, Wiley and Taylor & Francis, which collectively generated over US$7.1 billion in revenue from journal publishing in 2024 alone, and over US$12 billion in profits between 2019 and 2024 (Table 1A). Their profit margins have always been over 30% in the last five years, and for the largest publisher (Elsevier) always over 37%. Against many comparators, across many sectors, scientific publishing is one of the most consistently profitable industries (Table S1). These financial arrangements make a substantial difference to science budgets. In 2024, 46% of Elsevier revenues and 53% of Taylor & Francis revenues were generated in North America, meaning that North American researchers were charged over US$2.27 billion by just two for-profit publishers. The Canadian research councils and the US National Science Foundation were allocated US$9.3 billion in that year. A figure detailing the drain on researcher time. 1. The four-fold drain 1.2 Time The number of papers published each year is growing faster than the scientific workforce, with the number of papers per researcher almost doubling between 1996 and 2022 (Figure 1A). This reflects the fact that publishers’ commercial desire to publish (sell) more material has aligned well with the competitive prestige culture in which publications help secure jobs, grants, promotions, and awards. To the extent that this growth is driven by a pressure for profit, rather than scholarly imperatives, it distorts the way researchers spend their time. The publishing system depends on unpaid reviewer labour, estimated to be over 130 million unpaid hours annually in 2020 alone (9). Researchers have complained about the demands of peer-review for decades, but the scale of the problem is now worse, with editors reporting widespread difficulties recruiting reviewers. The growth in publications involves not only the authors’ time, but that of academic editors and reviewers who are dealing with so many review demands. Even more seriously, the imperative to produce ever more articles reshapes the nature of scientific inquiry. Evidence across multiple fields shows that more papers result in ‘ossification’, not new ideas (10). It may seem paradoxical that more papers can slow progress until one considers how it affects researchers’ time. While rewards remain tied to volume, prestige, and impact of publications, researchers will be nudged away from riskier, local, interdisciplinary, and long-term work. The result is a treadmill of constant activity with limited progress whereas core scholarly practices – such as reading, reflecting and engaging with others’ contributions – is de-prioritized. What looks like productivity often masks intellectual exhaustion built on a demoralizing, narrowing scientific vision. A table of profit margins across industries. The section of text related to this table is below: 1. The four-fold drain 1.1 Money Currently, academic publishing is dominated by profit-oriented, multinational companies for whom scientific knowledge is a commodity to be sold back to the academic community who created it. The dominant four are Elsevier, Springer Nature, Wiley and Taylor & Francis, which collectively generated over US$7.1 billion in revenue from journal publishing in 2024 alone, and over US$12 billion in profits between 2019 and 2024 (Table 1A). Their profit margins have always been over 30% in the last five years, and for the largest publisher (Elsevier) always over 37%. Against many comparators, across many sectors, scientific publishing is one of the most consistently profitable industries (Table S1). These financial arrangements make a substantial difference to science budgets. In 2024, 46% of Elsevier revenues and 53% of Taylor & Francis revenues were generated in North America, meaning that North American researchers were charged over US$2.27 billion by just two for-profit publishers. The Canadian research councils and the US National Science Foundation were allocated US$9.3 billion in that year. The costs of inaction are plain: wasted public funds, lost researcher time, compromised scientific integrity and eroded public trust. Today, the system rewards commercial publishers first, and science second. Without bold action from the funders we risk continuing to pour resources into a system that prioritizes profit over the advancement of scientific knowledge.
November 11, 2025 at 11:52 AM
Reposted by Lars Kaleschke
sundogplanets.mastodon.social.ap.brid.gy
G4 G4 G4!!! AURORAAAASSSS!!!!

https://www.swpc.noaa.gov/news/g4-severe-watch-effect-12-november
November 11, 2025 at 7:49 PM
seaice.de
Geomagnetic Storm Watches in Effect, to include G4 (Severe) potential for 12 November.

www.swpc.noaa.gov/news/g4-seve...
G4 (Severe) Watch in Effect for 12 November | NOAA / NWS Space Weather Prediction Center
www.swpc.noaa.gov
November 11, 2025 at 7:08 PM
Reposted by Lars Kaleschke
ursmansmann.bsky.social
Der schwere Magnetsturm auf dem Weg von der Sonne zur Erde könnte Stufe 4 von 5 erreichen, schätzen die Experten und ziemlich schnell hier eintreffen. Die Auswertung der Satellitendaten läuft noch, möglicherweise dauert das auch wegen des Shutdowns in USA länger als üblich.
Another, Faster Moving CME Blasts from the Sun Early on 11 November | NOAA / NWS Space Weather Prediction Center
www.swpc.noaa.gov
November 11, 2025 at 4:07 PM
Reposted by Lars Kaleschke
ursmansmann.bsky.social
Die große Schockwelle ist schneller als die vorherigen kleineren. Sie wird sie also einholen und sich mit ihnen vereinigen, was die Wucht erhöht. Zwar wird das Zentrum des Ausbruchs an der Erde vorbeifliegen, wir werden nur Ausläufer abbekommen, aber die können für Nordlichter in D reichen.
November 11, 2025 at 4:11 PM
Reposted by Lars Kaleschke
greatwhitecon.info
Here's a map of #Arctic sea ice thickness at the end of October:

greatwhitecon.info/2025/11/fact...

It's based on data from the CryoSat-2, Sentinel 3 and SMOS satellites.
A map of Arctic sea ice thickness on October 31st 2025. It's based on merged CryoSat-2, Sentinel 3 and SMOS data from the Alfred Wegener Institute.
November 7, 2025 at 3:00 PM
Reposted by Lars Kaleschke
polarbremen.bsky.social
Intensive and very productive workshop at @esa.int ESRIN in #Frascati 🇮🇹 to write the science plan 📝 for the large, international #AntarcticaInSync initiative! 🤝

More information about Antarctica InSync: www.antarctica-insync.org
November 7, 2025 at 9:18 AM
seaice.de
Just love watching the Arctic sea ice grow!
November 7, 2025 at 7:22 AM
Reposted by Lars Kaleschke
capitalweather.bsky.social
🌌 A strong geomagnetic storm is forecast tonight! 🌝 Currently expected to peak 8–11 PM ET & again before sunrise Fri. Aurora may reach our region, especially on long-exposure shots! 📸

All the details: www.washingtonpost.com/weather/2025...
Auroral oval forecast. The southern red line is where it is expected to be able to be seen with a naked eye, although photographs will often catch it further south and sometimes these storms end up delivering south of expected.
November 6, 2025 at 5:41 PM
Reposted by Lars Kaleschke
helmholtz.de
A total of six of the prestigious and highly endowed #ERC Synergy Grants have been awarded to research teams at the Helmholtz Association.

Congratulations to all successful applicants! www.helmholtz.de/en/newsroom/...
ERC Synergy Grants (Kopie 1)
ERC Synergy Grants (Kopie 1)
www.helmholtz.de
November 6, 2025 at 1:41 PM
Reposted by Lars Kaleschke
rav-ev.bsky.social
Wie tief will diese Regierung noch sinken? Erst wird die Aufnahme von massiv Schutzbedürftigen trotz Aufnahmezusage jahrelang verzögert - nun will man sich von der Verpflichtung freikaufen und setzt den Menschen mit einer Zweiwochenfrist die Pistole auf die Brust.
www.tagesschau.de/investigativ...
Aufnahmezusage: Bundesregierung bietet Afghanen Geld für freiwilligen Verzicht
Die Bundesregierung versucht nach Informationen des ARD-Hauptstadtstudios mit Geldzahlungen Afghaninnen und Afghanen in Pakistan dazu zu bewegen, auf ihre Aufnahmezusagen zu verzichten. Der Druck auf ...
www.tagesschau.de
November 4, 2025 at 9:20 PM
seaice.de
The Finnish Meteorological Institute (FMI) is accepting applications for a three-year postdoctoral researcher position focusing on the synergy of snow models, observations, and remote sensing over Arctic sea ice and lake ice.

valtiolle.fi/en/jobs/post...
Postdoctoral Researcher (synergy of snow models, observations, and remote sensing) - The Finnish Meteorological Institute
Open job: Postdoctoral Researcher (synergy of snow models, observations, and remote sensing), The Finnish Meteorological Institute - Find all jobs in Valtiolle.fi
valtiolle.fi
November 5, 2025 at 6:45 PM
Reposted by Lars Kaleschke
scar-antarctic.bsky.social
The first SCAR-Connect Online Training Series on the Antarctic Treaty System and the Antarctic Environments Portal will begin in just over an hour.
📝 5th November, 11:30am UTC.

Don't forget to register: eu.jotform.com/form/2529946...
November 5, 2025 at 10:20 AM
Reposted by Lars Kaleschke
eumetsat.int
Hello Sentinel-1D! 👋

Yesterday the satellite launched into orbit, and Meteosat-12's FCI instrument was ready to capture the moment from space.

Below: views in the 0.6µm channel (L) and (R) Rocket Plume RGB, revealing the rocket’s exhaust plume in the both visible and infrared range. 🚀
November 5, 2025 at 10:45 AM
seaice.de
"We find that retreat commenced immediately after the loss of decade-old fast ice in the Larsen B embayment"
www.nature.com/articles/s41...

The animation shows the changing sea ice condition at the former Larsen B ice shelf in 2022 compared to 2017.
#Antarctic #SeaIce #Glacier #Climate
November 5, 2025 at 9:55 AM
Reposted by Lars Kaleschke
signeaaboe.bsky.social
Refreezing is occurring in the Arctic. Worth keeping an eye on where the 2025 ice growth goes in the coming days. 🧐 (at present, third-lowest for this day of year.)
Line graph showing the daily sea-ice extent in the Arctic from 1978 to November 2025. The thick black line represents 2025, while the previous years are displayed in decadal-grouped colors. Ice is seen to grow since mid-September; however, the growth slows down in the last days.
November 5, 2025 at 8:43 AM
Reposted by Lars Kaleschke
zohrankmamdani.bsky.social
November 5, 2025 at 2:41 AM