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Lars Kaleschke

@seaice.de
2.8K followers 1K following 341 posts

Physicist. Climate, sea ice, earth observation @awi.de #Bremen orcid.org/0000-0001-7086-3299 det.social/@seaice

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Lars Kaleschke @seaice.de · 10h
New preprint open for discussion Lambotte, A. et al.: Distinct and synergistic influences of sea ice rheology and seabed stress on simulated Arctic fast ice, EGUsphere [preprint], doi.org/10.5194/egus..., 2026.
doi.org
Distinct and synergistic influences of sea ice rheology and seabed stress on simulated Arctic fast ice
Abstract. Fast ice (FI) refers to sea ice that remains mechanically immobilised along the coast for extended periods. In the Arctic, its presence influences the stability of the halocline by displacin...
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Deutsche Allianz Meeresforschung (DAM) @allianz-meer.bsky.social · 13h
🌊🔎 Die Wunder der #Meere live erleben: Beim Bremer Bürgerfest zur Deutschen Einheit präsentieren die regionalen Einrichtungen der #Meeresforschung vom 2.-4.10. ein buntes Prorgamm zum Eintauchen - von #Tiefsee über #Korallenriffe bis zum #Polareis. 👉 www.allianz-meeresforschung.de/veranstaltun...
Zwei Hände fassen auf den großen Touchscreen des Interaktiven Weltozeans der DAM, darauf liegt der Text: "Bremer Bürgerfest zur Deutschen Einheit; 2. - 4. Oktober, Innenstadt" und "MEERESFORSCHUNG ZUM ANFASSEN"
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Lars Kaleschke @seaice.de · 18h
New paper published today Koo, Y., Meier, W. N., and Stewart, J. S.: Pan-Antarctic evaluation of National Snow and Ice Data Center (NSIDC) sea ice drift product using high-resolution SAR and buoy data, Earth Obs., 1, 129–144, doi.org/10.5194/eo-1..., 2026.
doi.org
Pan-Antarctic evaluation of National Snow and Ice Data Center (NSIDC) sea ice drift product using high-resolution SAR and buoy data
Abstract. The recent historic minima in Antarctic sea ice extent suggest the possibility of new thermodynamic and dynamic conditions across the Southern Ocean. In investigating these thermodynamic and...
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ESA Earth Observation @esaearth.esa.int · 25/09/2026
And then there were three🛰️ ESA’s Programme Board for Earth Observation has selected ECO, Keystone and CryoRad to progress to the next phase toward Earth Explorer 12. The three concepts would investigate Earth’s energy balance, the upper atmosphere & polar ice sheets. 🔗 www.esa.int/Applications...
esa.int
Three Earth Explorer candidates go forward
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Zeke Hausfather @zekehausfather.com · 22/09/2026
The progress we made in moving away from higher emissions futures should tell us that progress is possible. But it shouldn't breed complacency; the risks remain far too high and grow with each molecule of carbon emitted. The world still isn’t nearly concerned enough.
nytimes.com
Opinion | Climate Catastrophe Is Still on the Table
Harrowing temperature increases remain unnervingly possible.
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Robert Rohde @rarohde.bsky.social · 22/09/2026
This is what a monster El Niño on an ocean already warmed by climate change looks like.
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heiseonline @heise.de · 21/09/2026
Schleswig-Holstein treibt den Wechsel von Microsoft auf Open Source voran. Nach E-Mail und Office läuft die Kieler Staatskanzlei nun weitgehend unter Linux. #Digitale Souveränität
heise.de
Nachfolger von Windows: Staatskanzlei Kiel stellt auf Linux um
Schleswig-Holstein treibt den Wechsel von Microsoft auf Open Source voran. Nach E-Mail und Office läuft die Kieler Staatskanzlei nun weitgehend unter Linux.
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Lars Kaleschke @seaice.de · 21/09/2026
Bremer Haltung im Bundesrat noch unklar www.butenunbinnen.de/nachrichten/...
butenunbinnen.de
Senator rechnet vor: Tankrabatt würde Bremen 14 Millionen Euro kosten - buten un binnen
Die Pläne des Bundes drohen ein weiteres Loch in den klammen Bremer Haushalt zu reißen. Finanzsenator Fecker spricht Klartext: "Das ist Geld, das wir derzeit nicht haben".
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Zeke Hausfather @zekehausfather.com · 21/09/2026
This year's El Niño event is moving into record territory, with the daily Oceanic Niño Index (ONI) tying the record previously set during the 2015/2016 super-El Niño. My latest over at Carbon Brief: www.carbonbrief.org/...
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Lars Kaleschke @seaice.de · 21/09/2026
“In science, each time you explore a new frequency domain, you make discoveries”
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Lars Fischer @fischblog.bsky.social · 18/09/2026
Wir hatten ja grad bundesweit die Woche der Klimaanpassung. Ich hab da mal was zum Thema geschrieben. Spoiler: es wird teuer und hilft nicht so wirklich.
spektrum.de
Klimapolitik: Anpassung wird uns nicht retten
Anpassung an den Klimawandel kann die Defizite beim Klimaschutz nicht auffangen, kommentiert Lars Fischer.
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Lars Kaleschke @seaice.de · 17/09/2026
#Europe and #Canada are talking about a closer partnership. @esa.int has been showing what that can look like for decades: Canada has been its only non-European Cooperating State since 1979.
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Zeke Hausfather @zekehausfather.com · 14/09/2026
Here is the latest combined forecast across all 14 models, compared to past strong El Nino events. It shows just how extreme and unprecedented this event is forecast to be:
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Dr. Melanie Bergmann @melaniebergma18.bsky.social · 10/09/2026
Am Samstag den 12. September haben wir in vielen Städten wieder die Chance, uns für ein Demokratie Prüfverfahren für Parteien einzusetzen, zum Beispiel in #Bremen um 17:00 Uhr am Bahnhofsvorplatz! Sag es weiter, komm vorbei und bring noch jemanden mit! #AFDVerbot @pruef-demos.de
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CIRES @cires.colorado.edu · 09/09/2026
GOOD NEWS: the Arctic Report Card will continue under its independent editorial team – led by researchers at CIRES @colorado.edu and @uafairbanks.bsky.social – with new support from @agu.org. cires.colorado.edu/news/2026-ar...
cires.colorado.edu
2026 Arctic Report Card finds critical support from strategic partners
The highly anticipated yearly assessment will continue under its independent editorial team led by CIRES researchers
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Ruth Mottram @ruthmottram.eurosky.social · 09/09/2026
Spoiler alert: The melange is not going to save us. But actually our findings are much more complex and interesting than just that. Full article in The Cryosphere here: tc.copernicus.org/articles/20/...
tc.copernicus.org
Mélange, landfast sea ice, ice velocities: What controls seasonal calving rates in North West Greenland?
Abstract. Calving glaciers in Greenland frequently exhibit seasonal cycles of terminus advance and retreat and changes in ice velocity and calving rate associated with changing air temperatures, surfa...
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Zack Labe @zacklabe.com · 09/09/2026
Last month was the all-time hottest month on record globally (albeit very close to July 2023). This was not surprising at all unfortunately... Graphic from zacklabe.com/climate-chan... using ERA5 data.
Graph showing monthly-mean global mean near-surface air temperatures for 2026 using a red line. There is a strong seasonal cycle, with a peak during the boreal summer season. There is a long-term warming trend. 2025 is also indicated, which was the warmest year on record. The other years from 1940 to 2025 are shown with sequential coloring for purple to yellow in each respective line. Data is from ECMWF ERA5 reanalysis. The graphic is updated through August 2026.
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The Barents Observer @thebarentsobserver.com · 01/09/2026
Over the coming months, warships and support vessels will carry out long-distance voyages in the Arctic Ocean. This is the first Northern Sea Route voyage for the Russia's new ice-classed patrol ship Ivan Papanin.
thebarentsobserver.com
Northern Fleet ships set course for the Northern Sea Route
Over the coming months, warships and support vessels will carry out long-distance voyages in the Arctic Ocean.
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Southern Ocean Observing System (SOOS) @soosocean.bsky.social · 01/09/2026
🌊 SOOS Update! Issue 35 is out! Explore five years of SOOS progress, the new SOOS 5-Year Report, SYNCHRONY, Antarctica InSync, new Working Group leaders, Polar Profiles, research, publications and more. 📖 Read it here: go.soos.aq/SOOSUpdateNo35
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KarSteN Haustein @khaustein.bsky.social · 31/08/2026
Here is an example of how relentless and excessive the heat has been in parts of Europe. Baden-Württemberg in SW Germany added a whopping 30% of hot days (>30°C) to the previous warmest year. London with 55 days w/o rain is also mad #ClimateEmergency Source: www.mtwetter.de (image modified) (2/2)
Graph with red dots and lines for each year that indicate the number of hot days above 30°C in SW Germany. 2026 sticks out like a sore thumb
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KarSteN Haustein @khaustein.bsky.social · 31/08/2026
Globally, the hottest August in observed history is just about to end. In Western Europe, the summer of 2026 (June, July, August) has been the warmest as well. Compared to this year, 1976 (the famous UK summer) and 2003 (the hottest EU summer so far) look like amateurs in terms of heat (1/2)
Global map of temperature departures with most continental regions as well as the tropical Pacific in red (hot). Parts of Antarctica in blue (cold)

Source: http://www.karstenhaustein.com/climateMap of Europe with blue and cold patches for cold and hot temperature departures from the long-term climate average (1961-1990). France and the UK in red. All else rather blue.Map of Europe with blue and cold patches for cold and hot temperature departures from the long-term climate average (1961-1990). All of central Europe in red. Parts of the Atlantic in blueMap of Europe with blue and cold patches for cold and hot temperature departures from the long-term climate average (1961-1990). All of central and Southern Europe in red. No blue left anymore.
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ECMWF @ecmwf.int · 31/08/2026
ECMWF's HPC system has around 1 million processors and 248 Graphics Processing Units that can perform many calculations in parallel. Around 1.5 exabytes (1,500,000,000,000,000,000 bytes) of data are currently stored, equivalent to roughly 175 billion music tracks. www.ecmwf.int/en/about/med...
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Meertext @meertext.bsky.social · 27/08/2026
Klimadaten aus Galapagos-Korallen deuten darauf hin, dass El Nino durch die menschengemachte Erderwärmung signifikant steigt. #Klimakrise
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Andrew Freedman @afreedma.bsky.social · 27/08/2026
A comprehensive new study finds that the El Niño events during the past 40 years are 36% stronger than those during the preindustrial era, a trend that is likely tied to climate change. www.cnn.com/2026/08/27/c... [THREAD] 1/
cnn.com
El Niño events are becoming stronger as the world warms | CNN
New research using samples taken from ancient and living coral shows that El Niño events have become more intense in the last 40 years.
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Geoff Brumfiel @gbrumfiel.bsky.social · 27/08/2026
New from @vantortech.bsky.social. Absolutely astonishing images of the China-Nepal Gyirong Port/Rasuwagadhi border post. Literally nothing is left. (Before 19 April, After 27 Aug)
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IPCC @ipcc.bsky.social · 27/08/2026
📣 Registration is now open for experts to review the First Order Draft of the Working Group I contribution to IPCC’s Seventh Assessment Report. Experts can register until 25 Sept 2026 👉https://bit.ly/4vi25cq Review period 10 Aug to 2 Oct 🔗 bit.ly/WGI7Fod
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Lars Kaleschke @seaice.de · 26/08/2026
🐻‍❄️😍 www.bbc.com/news/article...
bbc.com
Wildlife Photographer of the Year 2026 – the best pictures so far
The polar bear image taken by Audun Rikardsen was among the 'highly commended' entries in this year's competition.
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netzpolitik.org @netzpolitik.org · 24/08/2026
Die Bremer Straßenbahn AG wollte eigentlich gar keine automatisierte Verhaltenskontrolle, das System war nur gerade im Angebot. Ohne Plan und Ahnung von Persönlichkeitsrechten startete der Einsatz. Die Datenschutzaufsicht hat grundsätzliche Bedenken.
netzpolitik.org
Mit dieser Realsatire führte Bremen Verhaltensscanner ein
Die Bremer Straßenbahn AG wollte eigentlich gar keine automatisierte Verhaltenskontrolle, das System war nur gerade im Angebot. Ohne Plan und Ahnung von Persönlichkeitsrechten startete der Einsatz. Di...
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AWIs4Future @awis4future.bsky.social · 20/08/2026
Für die Expedition scheint es auch bald ein online Log Buch zu geben (gewissermaßen einen Log Blog: www.marum.de/en/Ship-s-lo...). Auf jeden Fall ein sehr interessantes Projekt, dass hier läuft.
marum.de
Ship's log MSM136
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Lars Kaleschke @seaice.de · 24/08/2026
English lawn summer 2026 edition #drought
Close-up of a dry, brown, sun-scorched lawn during summer 2026
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Zack Labe @zacklabe.com · 23/08/2026
🚨 Preliminary daily data shows we just broke the all-time highest global sea surface temperature in this record... Download high-resolution graphic at zacklabe.com/climate-chan.... This data (extrapolar ocean) is provided by @copernicusecmwf.bsky.social ERA5. 🌊
Graph showing daily global mean sea surface temperatures for 2026. This is also compared to the daily data from the 1981-2010 average and 1991-2020 average. Annotations are also shown to the current year with the other years from 1940 to 2026. There is a seasonal cycle. There is a long-term warming trend. 2023 and 2024 are also indicated, which were the warmest years on record. Data is from ECMWF ERA5 reanalysis and updated through 21 August 2026.
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Zeke Hausfather @zekehausfather.com · 13/08/2026
Here are my latest numbers incorporating the August 10th C3S model updates (and the rest of the August dynamic model runs) as well as July data from (most) datasets:
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Climatologist49 @climatologist49.bsky.social · 13/08/2026
🚨🚨🚨 The just released CPC El Nino forecast now calls for a peak Relative Oceanic Nino Index (RONI) of +2.7C (50th percentile) during the Oct-Dec period. This would exceed any 3-month RONI value in the entire ERSSTv6 database. 🔥🔥🔥
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Signe Aaboe @signeaaboe.bsky.social · 13/08/2026
2nd-lowest for the 1978-2026 period as well. Interesting drop in extent the last week...
screendump of OSI SAF Antarctic sea ice extent daily time series showing all years since 1978 to present. Currently, sea-ice extent made a large drop in recent days, becoming second-lowest for this time of year.
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Lars Kaleschke @seaice.de · 13/08/2026
#Antarctic #SeaIce is now the second-lowest level among the years shown for this date. 🌍🧊🛰️🌊
Line chart titled “Antarctic Sea Ice” showing daily sea-ice extent from 1992–2026. On 12 August 2026, Antarctic sea-ice extent is about 15.6 million km², the second-lowest level among the years shown for this date.
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Chris Baraniuk @chrisbaraniuk.com · 13/08/2026
Yikes. They really wanted to avoid this. It's a big problem for Romania's grid.
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Lars Kaleschke @seaice.de · 12/08/2026
Niemals vergessen!
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Zack Labe @zacklabe.com · 12/08/2026
I have also heard the same thing this summer! 🫤
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Eos @eos.org · 11/08/2026
“The loss of the Arctic Report Card would be significant not only for the scientific community, but also for decision-makers and the public,” says @zacklabe.com. eos.org/research-and...
eos.org
Government Pulls Funding for the Arctic Report Card - Eos
The Trump administration is pulling funding from NOAA’s Arctic Report Card, an annual, peer-reviewed report about the state of the region, which is warming more quickly than anywhere else on Earth.
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Zack Labe @zacklabe.com · 10/08/2026
It is truly devastating - the Arctic Report Card has been one of my favorite scientific endeavors. For two decades, it has documented conditions across the Arctic system, bringing together physical & social sciences with real-world observations & consistent updates. It’s not a climate change report.
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Rick Thoman @alaskawx.bsky.social · 10/08/2026
Devastating news for Arctic environmental monitoring today: NOAA pulls support for the Arctic Report Card, effective immediately. #Arctic #Climate
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Zack Colman @zcolman.bsky.social · 10/08/2026
SCOOP: Trump is ending federal support for NOAA's Arctic Report Card, a major annual update shedding light on the effect climate change has on the Arctic. subscriber.politicopro.com/article/2026...
subscriber.politicopro.com
POLITICO Pro: NOAA to end support for Arctic climate change report
The authors were informed Monday of the action, which jeopardizes public dissemination of the report on the fast-changing region.
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Zack Labe @zacklabe.com · 10/08/2026
We have very unfortunate news to share today... 😢 I've been an author for this report since 2020, and we just celebrated our 20th anniversary edition last year.
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Rick Thoman @alaskawx.bsky.social · 10/08/2026
The @ametsoc.org “State of the Climate” report for 2025 is out. From the Arctic Chapter: "The Arctic had its second-warmest year in the 126-year record. Surface air temperatures…are increasing at roughly three times the global average rate.” ametsoc.net/sotc2025/05T... #Arctic #Climate
ametsoc.net
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Simon Hammann @simonhammann.bsky.social · 10/08/2026
Beep beep your reviewer report is one day overdue beep beep
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David Ho @davidho.bsky.social · 09/08/2026
The Australian Antarctic Division and the Australian aviation company Skytraders just conducted a spectacular medevac of an American from the US National Science Foundation's McMurdo Station in -43°C, something that's never been done in July.
nytimes.com
Inside the Mission to Carry Out a Midwinter Medevac in Antarctica (Gift Article)
An Australian flight crew faced subfreezing temperatures, changing weather conditions and almost constant darkness as they worked to rescue a U.S. national.
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Lars Kaleschke @seaice.de · 07/08/2026
Postdoc in "Antarctic Sea Ice Observing Systems” 🌊🧊❄️🛰️🌍 jobs.awi.de/Vacancies/22...
jobs.awi.de
Postdoc in "Antarctic Sea Ice Observing Systems” (x/d/f/m)
Layout AWI Verwaltung englisch extern
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Marietta Slomka @mariettaslomka.bsky.social · 06/08/2026
Unsere neue Podcast-Ausgabe ist da: www.zdfheute.de/video/heute-...
zdfheute.de
heute journal - der Podcast: Gefahr durch „Super El Niño“?
Extreme Hitzewellen und Waldbrände bestimmen den Sommer 2026. Und nun beginnt noch das Klimaphänomen „El Niño”, das besonders heftig ausfallen soll.
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Zack Labe @zacklabe.com · 06/08/2026
Sea surface temperatures are way above average in parts of the #Arctic as of last month, particularly in the Kara Sea Basin extending to around Svalbard and the Greenland Sea. This is also found in the Hudson Bay due to their very early sea ice melt-out. Data from @noaa.gov OISSTv2.1 🌊
Polar stereographic map showing sea surface temperature anomalies in July 2026 relative to 1982 to 2010. Most areas are warmer than average. Sea-ice cover is also shown if sea-ice concentration is at least 15% per each grid point. Red is shown for warmer sea surface temperatures, and blue is shown for colder sea surface temperatures. Data is from OISSTv2.1.
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