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Reposted by EUMETSAT OSI SAF

Signe Aaboe @signeaaboe.bsky.social · 08/10/2026

Antarctic sea-ice extent has begun declining much earlier than usual and is currently at a level comparable to the record-low year of 2023 at this time of year. @osi-saf.eumetsat.int 🧪🌊❄️

Line plot of Southern Hemisphere sea-ice extent throughout the year from 1978 to 2026, with individual years coloured by decade and 2026 shown in black. Sea-ice extent follows a strong seasonal cycle, reaching its minimum in February and maximum in September. In 2026, sea-ice extent began declining unusually early and is currently close to, or below, the record-low levels observed in 2023.

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EUMETSAT CM SAF @cm-saf.eumetsat.int · 07/10/2026

Arctic sea ice is thinner, darker and more mobile than 40 years ago. A review examines changing sea ice at both poles, drawing on CM SAF CLARA-A3 sea-ice albedo data. For #WorldSpaceWeek, explore what long-term observations reveal: doi.org/10.1038/s430...

doi.org

Changes in Arctic and Antarctic sea-ice properties and processes - Nature Reviews Earth & Environment

Sea ice modulates the energy exchange between the atmosphere and ocean through complex, time-varying processes. This Review describes changes in Arctic and Antarctic sea-ice properties and processes, ...

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 05/10/2026

The 2026 minimum for Arctic sea ice extend was reached on 13/09/2026, with 5,067,770 km² (14th lowest minimum) The 2026 maximum for Antarctic sea ice extend was reached on 10/09/2026, with 18,191,467 km² (3th lowest maximum) more: osi-saf.eumetsat.int/sea-ice-inde...

osi-saf.eumetsat.int

Sea-Ice Index daily | OSI SAF

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 05/10/2026

In September 2026, the #SeaIce global extent was 7% below 1991-2020 mean. Since the beginning of records (1978): - #Arctic, 16th lowest monthly mean, with 10% less extent (-573.612km²) - #Antarctic, 3th lowest monthly mean, with 6% less exent (-1.199.847km²) more: osi-saf.eumetsat.int/sea-ice-index

Graph showing the Arctic Sea Ice Extent daily value for each year since 1978 (each year is represented with a curve of a different color)

Graph showing the Antarctic Sea Ice Extent daily value for each year since 1978 (each year is represented with a curve of a different color)

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 24/09/2026

Anton Verhoef now present the work going on at @knmi.nl on our high #ASCAT 6km product

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 24/09/2026

To start the day at @eumetsat.int conference, OSI SAF is represented on stage by our #SeaIce expert Thomas Lavergne.

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Signe Aaboe @signeaaboe.bsky.social · 16/09/2026

Arctic sea-ice extent is approaching its annual minimum: - remaining below the climatological values and - currently among the 13 lowest minima on record. Data: @osi-saf.eumetsat.int sea-ice index v3

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Signe Aaboe @signeaaboe.bsky.social · 16/09/2026

Similarly, Antarctic sea-ice extent is approaching its annual maximum: - remaining well below the climatological values - currently on track for the third-lowest maximum on record. Data: @osi-saf.eumetsat.int sea-ice index v3

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Signe Aaboe @signeaaboe.bsky.social · 17/09/2026

Interesting to compare the 2 sea-ice indices: extent and area. While Arctic sea-ice extent is still approaching its annual minimum, sea-ice area has already passed its minimum. This suggests that initial freeze-up mainly increases ice concentration before expanding the cover. @osi-saf.eumetsat.int

Line plot of Northern Hemisphere sea-ice extent throughout the year for 1978 to 2026, with individual years coloured by decade and 2026 shown in black. Sea-ice extent follows a strong seasonal cycle, decreasing from about 14 to 16 million km² in March to a minimum in September before increasing again. In mid-September 2026, sea-ice extent is still approaching its annual minimum.

Line plot of Northern Hemisphere sea-ice area throughout the year for 1978 to 2026, with individual years coloured by decade and 2026 shown in black. Sea-ice area follows a strong seasonal cycle, decreasing from about 13 million km² in March to a minimum in September before increasing again. In 2026, sea-ice area reached its annual minimum in late August/early September and began increasing by mid-September.

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 15/09/2026

The @eumetsat.int satellite conference is already coming up next week! An important delegation from our project team will take part in this event, presenting current and upcoming developments. More about our participations: osi-saf.eumetsat.int/community/st... Looking forward to meeting you!

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 07/09/2026

Our long timeserie of #SeaIce concentration allows to build on Climate #Normals and to deduce #Anomalies. Check it out on the new @eumetsat.int CAN service, alongside many other parameters used to document climate evolution.

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 07/09/2026

In August 2026, the #SeaIce global extent was 7% below 1991-2020 mean. Since the beginning of records (1978): - #Arctic, 12th lowest monthly mean, with 9% less extent (-617,526km²) - #Antarctic, 4th lowest monthly mean, with 6% less exent (1,178,424km²) for more: osi-saf.eumetsat.int/sea-ice-index

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 18/08/2026

You have questions about our Sea and Ice Surface Temperature products? You want to learn about the last updates? Then this webinar is made just for you: Join us on 2/9/2026 to learn about EUMETSAT SST and IST product portfolio. for more: classroom.eumetsat.int/course/view.... 🌊❄️🛰️

Image advertising a webinar on Sea Surface Temperature, planned on 2/9/2026 12:00-14:00 UTC

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 05/08/2026

In July 2026, the #SeaIce global extent was 7.8% below 1991-2020 mean. Since the beginning of records (1978): - #Arctic, 6th lowest monthly mean, with 9.6% less extent than normal (-878,322 km²) - #Antarctic, 5th lowest monthly mean, with 6.4% less exent than normal (-1,044,619km²)

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The Group for High Resolution Sea Surface Temperature @ghrsst.bsky.social · 24/06/2026

🌊The GHRSST Colour Palette Task Team has reached a consensus recommendation at #GHRSST27: use #HomeyerRainbow from #cmweather for displaying #SST data. It provides a strong compromise between readability, colour-blind accessibility and smooth gradient rendering, available on @matplotlib.org. (1/2)

Global OSTIA SST analysis for 31 August 2025 plotted using the HomeyerRainbow colour palette from cmweather. The temperature scale ranges from -3°C to 37°C.

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 06/07/2026

Like the majority of our #SeaIce products, the Sea Ice Index is currently based on data from #JAXA 's #AMSR2 sensor. This sensor is being operationally replaced by its successor, #AMSR3, and we are currently adapting our products accordingly. For more details: osi-saf.eumetsat.int/community/st....

osi-saf.eumetsat.int

Implications of AMSR2 being replaced by AMSR3 on OSI SAF products | OSI SAF

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 06/07/2026

In June 2026, the #SeaIce global extent was 7% below 1991-2020 mean. Since the beginning of records (1978): - #Arctic, 6th lowest monthly mean, with 5% less extent (-567,575 km²) - #Antarctic, 6th lowest monthly mean, with 8% less exent (-1,141,933 km²) for more: osi-saf.eumetsat.int/sea-ice-index

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 01/07/2026

An important milestone for us as for all our fellow SAFs !

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 25/06/2026

Our Sea Surface Temperature team is represented at #GHRSST27 in Sapporo by project team from @ifremer.bsky.social, @dmidk.bsky.social, @meteofrance.com and @met.no. We are exchanging with the worldwide community to keep improving our products!

Project team members of OSI SAF in front of the GHRSST27 meeting venue in Sapporo.

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 24/06/2026

Our Sea Surface Temperature team has been working within the @ghrsst.bsky.social on how to best present you our data. Expect our viewers to change!

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 11/06/2026

In May 2026, the #SeaIce global extent was 6.9% below 1991-2020 mean. Since the beginning of records (1978): - #Arctic, 4th lowest monthly mean, with 4.4% less extent (-575,397km²) - #Antarctic, 7th lowest monthly mean, with 8.7% less exent (-923,279km²) for more: osi-saf.eumetsat.int/sea-ice-index

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 13/05/2026

same place 29 years earlier, another OSI SAF meeting. Can you spot the two gentlemen that are on both photos ?

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 13/05/2026

On Tuesday 12/05 and Wednesday 13/05 our Steering group has gather in Météo-France #Lannion. Representatives from @eumetsat.int, @meteofrance.com, @dmidk.bsky.social, @knmi.nl, @met.no and @ifremer.bsky.social came together to discuss the project progress.

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 05/05/2026

Yesterday was a big day for OSI SAF, as we release operationaly our new Sea Ice Index (version 3.0), together with our AMSR2 based Sea Ice Concentration Interim Climate Data Record. The graph you will find on our website are now from the latest version: osi-saf.eumetsat.int/sea-ice-index

osi-saf.eumetsat.int

Sea-Ice Index | OSI SAF

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 05/05/2026

In April 2026, the Sea-Ice global extent was 7% below 1991-2020 mean. Since the beginning of records (1978): - #Arctic, 2rd lowest monthly mean, with 5% less extent (-692,385km²) - #Antarctic, 11th lowest monthly mean, with 10% less extent (-704,134km²) more on osi-saf.eumetsat.int/sea-ice-index

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 30/04/2026

These two products will be impacted by the swap from AMSR2 to AMSR3 sensor next summer. To follow the informations about this swap, check on our website: osi-saf.eumetsat.int/community/st... If you are interested in these products, don't hesitate to register to our service messages ! 4/4

osi-saf.eumetsat.int

Implications of AMSR2 being replaced by AMSR3 on OSI SAF products | OSI SAF

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 30/04/2026

The Sea-Ice Index version 3, based on our 4 operationals Climate Data Records and Interim Climate Data Records, will officially provide figures and maps of the Sea Ice extend evolution from 1978 to present. More info on osi-saf.eumetsat.int/community/li... 3/4

osi-saf.eumetsat.int

Operational release of the Sea-Ice Index Version 3 (OSI-420-a) | OSI SAF

The OSI SAF sea ice team is pleased to announce the operational release of its new Sea-Ice Index Version 3.0 (OSI-420-a) on 4th May 2026. Previously distributed as a demonstrational since 2020, this v...

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 30/04/2026

The Global Sea-Ice Concentration Interim Climate Data Record (AMSR), together with the AMSR Climate Data Record it complements will provide a coverage of #Sea-Ice concentration, retrieved from AMSR sensors from 01/06/2002 to present. More info on osi-saf.eumetsat.int/community/li... 2/4

osi-saf.eumetsat.int

Operational release of the Global Sea-Ice Concentration Interim Climate Data Record (AMSR), OSI-438 | OSI SAF

The OSI SAF sea ice team is pleased to announce that the OSI SAF global Sea-Ice Concentration (SIC) Interim Climate Data Record (ICDR) from AMSR (OSI-438) will be released on 4th May 2026.

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 30/04/2026

We are excited to announce the official release of two Sea-Ice climate products on next Monday (04/05): Our Global Sea-Ice Concentration Interim Climate Data Record (AMSR) osi-saf.eumetsat.int/products/osi..., and our Sea-Ice Index version 3 osi-saf.eumetsat.int/products/osi... 👇 1/4

View of data from the OSI-438 (left) and OSI-420-a (right)

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EUMETSAT Users @eumetsat-users.bsky.social · 10/04/2026

Our latest climate case study looks at how satellite climate data records help scientists understand shifts in polar sea ice extents bit.ly/4vg7G3X by @hayleyeversking.bsky.social @rroebeling.bsky.social @brloveday.bsky.social @gwenbras.bsky.social & Thomas Lavergne @met.no

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Copernicus ECMWF @copernicusecmwf.bsky.social · 10/04/2026

❄ The March 2026 #C3S Climate Bulletin reports the lowest Arctic March sea ice extent in the 48-year satellite record at 5.7% below average, and tied lowest maximum winter extent. Antarctic sea ice extent was 10% below average. 🔗 climate.copernicus.eu/sea-ice-cove... @osi-saf.eumetsat.int

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EUMETSAT @eumetsat.int · 07/04/2026

In 2024, Spain flooded, wildfires swept Portugal, & Scandinavian & Svalbard glaciers lost more mass than any year on record. EUMETSAT data help power the #Copernicus Climate Change Service, turning measurements from space into public understanding.🛰️ Learn more in our latest article: bit.ly/4e29K9C

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 02/04/2026

The minimum daily extend for 2026 in #Antarctic was reached on 22/02/2026, with 2,862,440km². The maximum daily extend for 2026 in #Arctic was reached on 07/03/2026, with 14,433,682km², which makes 2026 the year with the second lowest maximum, just after 2025.

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 02/04/2026

In March2026, the #SeaIce global extent was 6.8% below 1991-2020 mean. Since the beginning of records (1978): - #Arctic, 1st lowest monthly mean, with 6% less extent (-856,735km²) - #Antarctic, 14th lowest monthly mean, with -10%> less exent (-441,262km²) for more: osi-saf.eumetsat.int/sea-ice-index

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EUMETSAT @eumetsat.int · 02/04/2026

🧊 Image of the Week: Global Sea Ice - 2024 This week's image captures sea ice extent in August 2024, taken from a full-year animation using data from @osi-saf.eumetsat.int. The image and full 2024 Arctic and Antarctic sea ice visualisations are available at the here: bit.ly/4bWAqWE

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 26/03/2026

One year (2024) of our Sea Ice Concentration data displayed in a single animation.

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 25/03/2026

At @ifremer.bsky.social , our partner is working hard on our future small icebergs climate products, based on #altimetry. The data record, covering 1992 to present. This product is planned to be released in 2026 ! For more information, check our latest story : osi-saf.eumetsat.int/community/st...

Map displaying mean iceberg probability in antarctica (Illustration from Altiberg 2.1 product from Ifremer - no date)

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 25/03/2026

Find the WMO repport Sea Ice Extend graphs on the interactive Dashboard at www.jkclimate.fr/InteractiveD...

jkclimate.fr

Sea ice extent

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 25/03/2026

We are honoured that our Sea Ice Index v2.3 has been used for the @wmo-global.bsky.social's #StateOfClimate 2025. This is a true aknowledgement of the quality of the data we provide. Check the repport at library.wmo.int/records/item... For more, check our index at osi-saf.eumetsat.int/sea-ice-index

library.wmo.int

WMO e-Library

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 06/03/2026

New story on our website: Usage of Machine Learning to correct the Sea Surface Wind forecasts Numerical Weather Prediction model with Scatterometer observations check at osi-saf.eumetsat.int/community/st...

osi-saf.eumetsat.int

Usage of Machine Learning to correct the Sea Surface Wind forecasts Numerical Weather Prediction model with Scatterometer observations | OSI SAF

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 02/03/2026

In february 2026, the #SeaIce global extent was 5% below 1991-2020 mean. Since the beginning of records (1978): - #Arctic, 3rd lowest monthly mean, with 5% less extent (-712,597km²) - #Antarctic, 26th lowest monthly mean, with 3% less exent (-105,212km²) for more: osi-saf.eumetsat.int/sea-ice-index

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 02/02/2026

In January 2026, the #SeaIce global extent was 7% below 1991-2020 mean. Since the beginning of records (1978): - #Arctic, 3rd lowest monthly mean, with 6% less extent (-769,999km²) - #Antarctic, 18th lowest monthly mean, with 8% less exent (-451,325km²) for more: osi-saf.eumetsat.int/sea-ice-index

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EUMETSAT Users @eumetsat-users.bsky.social · 20/01/2026

A reminder that Applications for 2026 @eumetsat.int Supporting Marine Applications course are now open! Gain hands-on experience accessing/using marine satellite data & co-develop a mini-project idea with us. Collab with @osi-saf.eumetsat.int & DGFI-TUM, see tinyurl.com/EUM-SMA-2026

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Copernicus ECMWF @copernicusecmwf.bsky.social · 22/01/2026

❄ December 2025: Arctic sea ice extent was the lowest on record for December in the 47-year satellite record, about 9% below average. Antarctic extent ranked seventh-lowest for the month, about 10% below average. #C3S Climate Bulletin 👉 climate.copernicus.eu/sea-ice-cove... @osi-saf.eumetsat.int

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 12/01/2026

Registration is now open for the online training course Supporting Marine Earth Observation 2026. If you want to train yourself to use satellite observation of the ocean, check this out! 🛰️🌊🌍

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 06/01/2026

In December 2025, the #SeaIce global extent was 9% below 1991-2020 mean. Since the beginning of records (1978): - #Arctic, 1st lowest monthly mean, with 9% less extent (-1,130,503km²) - #Antarctic, 7th lowest monthly mean, with 10% less exent (-1,090,481km²) more: osi-saf.eumetsat.int/sea-ice-index

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 10/12/2025

In November 2025, the #SeaIce global extent was 9% below 1991-2020 mean. Since the beginning of records (1978): - #Arctic, 2nd lowest monthly mean, with 12% less extent (-1,198,440km²) - #Antarctic, 4th lowest monthly mean, with 7% less exent (-1,188,737 km²) more: osi-saf.eumetsat.int/sea-ice-index

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EUMETSAT Users @eumetsat-users.bsky.social · 11/11/2025

Antenna maintenance for the EUMETCast Europe service tomorrow, risk of interruption, see full details user.eumetsat.int/news-events/... #remotesensing

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