Martin Stendel
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martinstendel.bsky.social
Martin Stendel
@martinstendel.bsky.social
1.8K followers 730 following 230 posts
Senior Researcher, Danish Meteorological Institute
Coordinator of PolarPortal (lots of up-to-date Arctic data) and ROPEWALK (huge Danish logbook digitization project)
Conveying science to the public.
Born @317 ppm.
Mastodon @MartinStendel@fediscience.org
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martinstendel.bsky.social
Martin Stendel @martinstendel.bsky.social · 17d
Kalaallit Nunaat Kalaallit pigaat
(Greenland is the property of the Greenlanders)
Demonstration against Trump's imperialism in Copenhagen on 17 January 2026. Demonstration against Trump's imperialism in Copenhagen on 17 January 2026. Demonstration against Trump's imperialism in Copenhagen on 17 January 2026. Demonstration against Trump's imperialism in Copenhagen on 17 January 2026.
martinstendel.bsky.social
Well, I've seen the aurora in Greenland, Svalbard and Alaska, but never before in Copenhagen (even though I tried at least 30 times). But tonight, I was lucky. Between 22.15 and 22.30 not to the north, but rather almost above me.
Aurora over Copenhagen 19 January 2026 Aurora over Copenhagen 19 January 2026 Aurora over Copenhagen 19 January 2026 Aurora over Copenhagen 19 January 2026
January 19, 2026 at 11:27 PM
Reposted by Martin Stendel
sleestak.bsky.social
These are the icy mountains of Pluto. It took 9 years to get these magnificent images… and 4.8 billion kilometers.
January 18, 2026 at 7:39 PM
martinstendel.bsky.social
En lille griner i en mørk tid
Bus 1A i København. Destinations-skilt siger "Vi skal ikke hjem - vi skal videre"
January 18, 2026 at 8:05 PM
martinstendel.bsky.social
Kalaallit Nunaat Kalaallit pigaat
(Greenland is the property of the Greenlanders)
Demonstration against Trump's imperialism in Copenhagen on 17 January 2026. Demonstration against Trump's imperialism in Copenhagen on 17 January 2026. Demonstration against Trump's imperialism in Copenhagen on 17 January 2026. Demonstration against Trump's imperialism in Copenhagen on 17 January 2026.
January 18, 2026 at 11:12 AM
Reposted by Martin Stendel
polarportal.bsky.social
The #PolarPortal seasonal report for 2024/2025 can now be downloaded. As always, in English, Danish and Greenlandic! See polarportal.dk/en/news/tran....
(Photo credit: @ruthmottram.bsky.social, DMI)
Fishing boats returning in the open water in front of the village of Qaanaaq, north-west Greenland, 25 May 2025. This is the earliest date in the record for this event. Credit: Ruth Mottram, DMI
January 14, 2026 at 8:30 AM
Reposted by Martin Stendel
cwebbonline.com
A Black man was killed by ICE (off duty) in Los Angeles on New Year’s Eve. And like Renée Good, he was an American citizen. But most people have not heard about Keith Porter.

I need y’all to realize this. Black people experience this lack of visibility all the time when it comes to being victims.
January 10, 2026 at 3:24 PM
martinstendel.bsky.social
Cold winter weather in Europe is coming to an end on Monday.
January 9, 2026 at 4:48 PM
Reposted by Martin Stendel
rowhoop.bsky.social
New podcast:
Why does America want Greenland?
Resources, strategy and network cities
with @ruthmottram.bsky.social, @martinstendel.bsky.social, and Greenlander Anne Merrild

open.spotify.com/episode/66gW...
Why does America want Greenland?; Mystery of dark DNA; Ozempic weight rebound
Spotify video
open.spotify.com
January 9, 2026 at 2:26 PM
martinstendel.bsky.social
Map of the Epstein files
Map of Greenland
January 8, 2026 at 4:19 PM
martinstendel.bsky.social
Den grønlandske regering har ikke brug for rådgivning, heller ikke fra mig.
Men ville man spørge mig alligevel, ville jeg anbefale at parkere en tankvogn fyldt med kerosin midt på runway i Nuuk hver nat. En flyver med marines, og det hele er forbi, før vi kan sige "f*ck, hvad er det?".
News from the Danish public service station DR about Maduro (headlines, in Danish).
January 4, 2026 at 9:34 AM
martinstendel.bsky.social
To cite the president whose name I cannot remember, closing down NCAR will be yet another step towards the United Sh*tholes of America.
Mesa Laboratory at NCAR, the National Center for Atmospheric Research in Boulder, Colorado. Loop Images/Contributor via Getty Images
December 18, 2025 at 10:45 AM
martinstendel.bsky.social
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 1:37 PM
martinstendel.bsky.social
Africa seen by African journalists. Highly recommended!
thecontinent.org The Continent @thecontinent.org · Dec 12
All Protocol Observed

Welcome to Issue 224 of The Continent

We celebrate people whose purpose and passion shine through a tumultuous 2025, embodying Khalil Gibran’s words that “work is love made visible.” Meet our Africans of the Year: bit.ly/224_TC
This is the cover of issue 224 of The Continent. It is illustrated by Nzilani Simu. The background is a deep purple with subtle patterns. On the cover is a collage of portraits of the Africans of the Year as selected by the team at The Continent.
December 13, 2025 at 2:47 PM
martinstendel.bsky.social
New GRACE data available on the Polar Portal. From April 2002 to July 2025, the Greenland Ice Sheet has lost roughly 5200 gigatonnes (=km³). This has contributed 1.5 cm to global sea level rise and would be enough to cover Denmark with 121 m of water.

polarportal.dk/en/greenland...
Time series showing the mass balance for the Greenland Ice Sheet from April 2002 to July 2025. There is a gain in the mass of ice when there is precipitation, and a loss when snow and ice melt and when icebergs break off from the ice sheet’s major outlet glaciers. The difference in these mass changes over a glaciological year (September-August) is called the total mass balance of the Greenland Ice Sheet. Shown here is the month-by-month mass change measured in gigatonnes, Gt (1 Gt is 1 milliard (UK) or 1 billion (US) tonnes or 1 cubic kilometer of water). The data is obtained from the GRACE and GRACE-FO satellites. Over the last 23 years, the ice sheet has lost about 5200 gigatonnes of ice. This has led to a sea level rise of 1.5 centimetres.
December 3, 2025 at 1:58 PM
martinstendel.bsky.social
Hurricane Melissa, an extremely dangerous category 5 hurricane with a core pressure of 892 hPa (rank 3) and maximum sustained winds of 295 km/h (also rank 3) just before landfall on Jamaica's south coast. After crossing the island, it will also hit eastern Cuba. Note that one can see "down" the eye.
October 28, 2025 at 3:56 PM
martinstendel.bsky.social
Not extremely convincing, but I managed to see comet Lemmon. All photos with my Samsung S22, night mode, three minutes exposure.
The leftmost five stars of Big Dipper can be seen in the upper right corner. The bright star near the lower left corner is Arcturus, the fourth brightest star in the skies. Halfway between Alkaid (the leftmost star of Big Dipper) and Arcturus, comet Lemmon is the greenish spot which slightly looks out of focus. The comet is in the lower left corner. Note the tiny tail. Note also the second star in Big Dipper, which actually is a double star (Alkor and Mizar). Lemmon is the greenish dot left of the middle of the photo.
October 20, 2025 at 2:47 PM
martinstendel.bsky.social
151 years and almost 9 months of daily maximum temperatures in Copenhagen, 1874-2025!
Green line: daily average
Light blue/orange: 10 and 90 percentiles
Blue/red: absolute lowest and highest maximum
Purple: values for 2025.
Grey: all other years
Warm mid-September exceeding the old record from 1947.
Graphic showing daily values of maximum temperature in Copenhagen, 1874 to mid-September 2025. Lines in different colours: Green line in the middle: daily average Light blue/orange: 10 and 90 percentiles Blue/red: absolute lowest and highest maximum Purple: values for 2025. Grey: all other years Warm mid-September exceeding the old record from 1947.
September 23, 2025 at 11:37 AM
Reposted by Martin Stendel
katmabu.bsky.social
Trump just designated “Antifa” as a terrorist organization, on par with ISIS and Al Qaeda. As a reminder, “antifa” is short for “antifascist”.

They will use this lie to surveil, imprison, and kill Americans on the left.

This may be our Reichstag Fire moment. Wake up.

www.cnn.com/2025/09/17/p...
Trump says he’s designating Antifa as a terrorist organization | CNN Politics
President Donald Trump said he is designating the far-left anti-fascism movement Antifa as a terrorist organization, announcing the move on his Truth Social platform in the early hours of Thursday mor...
www.cnn.com
September 18, 2025 at 1:48 AM
martinstendel.bsky.social
Mondfinsternis - Lunar eclipse - Måneformørkelse
Total lunar eclipse on 7 September 2025 seen from Copenhagen. Total lunar eclipse on 7 September 2025 seen from Copenhagen. Total lunar eclipse on 7 September 2025 seen from Copenhagen.
September 7, 2025 at 7:18 PM
martinstendel.bsky.social
Things were easier in 1954 when meteorologists still wore ties.
Cover painting for Collier's magazine, May 1954, entitled Weather made to order? In the foreground, a meteorologist with a white shirt, tie, and glasses moves a large lever on a control panel. Leaning back, he looks at the sky of the landscape behind him. One half of the background shows a red and orange sky and a sunny green landscape. The other half shows dark storm clouds. Snow is covering the ground and also falling, while a stroke of lightning hits the ground.
September 6, 2025 at 1:43 PM
Reposted by Martin Stendel
polarportal.bsky.social
Accumulated surface mass balance (SMB) 1 Sep 2024 to 31 Aug 2025 was 403.8 Gt (=km³), close to the average 1980-2025. SMB is snowfall - runoff, i.e. always positive.
This is NOT the total mass balance TMB, which also includes iceberg calving and which shows ice loss for the 29th year in a row.
The accumulated surface mass balance (SMB) for the "SMB year" 1 September 2024 to 31 August 2025 ended at 403.8 Gt (=km³), which is a little above the average 1980-2025, mainly due to the rather cool summer. There is mass gain over the interior of the ice sheet and mass loss along the coasts, in particular in southwestern Greenland.
September 2, 2025 at 9:35 AM
martinstendel.bsky.social
Components of the total mass balance TMB, hydr. years 1987-2025:
SMB: surface mass balance (snowfall-runoff),
MMB: marine mass balance (calving of icebergs),
BMB: basal mass balance (friction).
2024/25: the 29th year in a row with negative TMB.
Update of Mankoff et al. (2021), tinyurl.com/295khdnk.
Components of the total mass balance over the Greenland Ice Sheet for the hydrological years 1987-2025. The hydrological year 2025 goes from 1 September 2024 to 31 August 2025, similar for other years. Total mass balance TMB: red line, should be zero on average, but isn't. Greenland has lost ice for the last 29 years in a row. TMB is the sum of the following three components: SMB: surface mass balance (snowfall minus runoff, blue line) - always positive, only possibility for the ice sheet to gain mass. Highly variable ("weather"); MMB: marine mass balance (calving of icebergs, melting of glacier tongues in contact with sea water, green line) - always negative, ice loss has slightly increased over time; BMB: basal mass balance (frictional effects, ground heat flux, orange line) - small, but also always negative. In 2024/25, the Greenland Ice Sheet has lost 105 Gt (=105 cubic kilometers) of ice. Note that the SMB values differ from those published on the @polarportal, since the figure shown here is an average of three models. Based on Mankoff et al. (2021, updated), https://doi.org/10.5194/essd-13-5001-2021.
September 1, 2025 at 10:12 AM
martinstendel.bsky.social
As it is quite probable that at the end of the week it turns out that it is worth starting a war of aggression, I asked Gemini to give me a map of Europe showing Putin's next desires (i.e., all countries bordering either Russia or Belarus). I must say the result is pretty convincing.
Map of Europe according to Gemini with lots of mistakes. What should be Poland is labelled Latvia, what should be Romania is labelled Ukraine, what should be Iceland is labelled Norway etc. etc.
August 11, 2025 at 8:15 AM
Reposted by Martin Stendel
rahmstorf.bsky.social
Sehr cool.
www.chronotrains.com/de/explore/2...
August 11, 2025 at 6:00 AM
martinstendel.bsky.social
Melting over 80.6% of the area of the Greenland Ice Sheet. This is the highest value in our data set, which starts in 1981.

@polarportal.bsky.social
Screenshot from polarportal.dk, a website that makes research on the Arctic research conducted by Danish institutions available to the public and researchers. The image shows Greenland in tan and the Greenland Ice Sheet in red and white. The red part indicates melting and covers all except about 20% in the northeast, which is roughly the area higher than 2500 m above Se level. Below the map is a chart that compares 2025 melting to the 1981-2010 average. The average melting peaks in mid-July at about 35%. For the last few days, melting has occurred over roughly 80% of the area of Greenland, with a maximum melt area of 80.6% on 24 July 2025. This is the highest value in our dataset, which starts in 1981.
July 25, 2025 at 7:58 PM