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Reposted by EUMETSAT OSI SAF

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

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

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

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

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

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

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

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

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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EUMETSAT @eumetsat.int · 04/11/2025

Our Q3 2025 Global Weather video is here! 🌍 See how major weather events looked from space in Jul–Sept, with storms coloured from light yellow - deep red by intensity. As always, its thanks to our partners we get these stunning global views. Watch the planet’s weather in motion: 🔗 bit.ly/3LmbYoc

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 29/10/2025

The oceanographic Chinese satellite #HY-2C allowed us to retrieved wind around #Melissa yesterday, while the hurricane was raging over #Jamaïca. The maximum winds retrieved around the hurricane range between 80km/h and 90km/h. For more information, check our multi-tile viewer: tinyurl.com/43cju2fa

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Antonio Vecoli (@tonyveco on X) @tonyveco.bsky.social · 29/10/2025

🔴⚠️🌀🇯🇲With landfall in Cat.5, #Melissa is the strongest #hurricane to hit #Jamaica, with winds at almost 300km/h & first below 900mb in the Atlantic for the last 95 years. Stunning 📸#Sentinel2 of it with an eye of more than 20km on Oct.28

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 28/10/2025

OSI SAF's team is getting ready for the fair of opportunity at the @eumetsat.int #climate symposium. Come and meet us there!

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EUMETSAT AC SAF @ac-saf.eumetsat.int · 24/10/2025

EUMETSAT Climate Symposium is on next week, 28-30 Oct. Meet us there. Here is Merged GOME-2 tropospheric NO2 column for Western Europe for the period 01/2007 - 12/2024. #GOME-2 #EUMETSAT #NO2 www.eumetsat.int/eumetsat-cli...

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 17/10/2025

Due to unstable access to #SSMIS data, we are suspending today the distribution of our #SeaIce concentration interim climate data record based on it (OSI-430-a). We advise all users to switch to our #AMSR2 based climate products. for more info: osi-saf.eumetsat.int/community/li...

OSI SAF suspends its Climate product still based on SSMIS (Interim Climate Data Record)

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 17/10/2025

An interesting story about the links between #clouds and #SeaSurfaceTemperature, by our colleagues from the #CMSAF :

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EUMETSAT Users @eumetsat-users.bsky.social · 08/10/2025

Satellite data confirm that global warming accelerates as marine clouds break up due to ocean warming 🌊. Research by Abhay Devasthale & Karl-Göran Karlsson (SMHI) and @rroebeling.bsky.social, 👀 read it here bit.ly/3VVecwE #earthobservation #remotesensing

Sunset over the ocean. Credit: Great Brut Here/stock.adobe.com

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 07/10/2025

Looking forward to produce Sea Surface Temperature products from METimage data!

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EUMETSAT @eumetsat.int · 06/10/2025

We’re marking 25 years of Climate@EUMETSAT! Join us in Darmstadt (28–30 Oct) for the EUMETSAT Climate Symposium & help shape future climate activity, from guiding products & services to ensuring our space-based observing system meets society’s needs. 🚨 Last chance to register! Visit bit.ly/46T6IPP

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 02/10/2025

In September, the #SeaIce global extent was 5.8% below 1991-2020 mean. Since the beginning of records: - #Arctic, 13th lowest monthly mean, with 11.5% less extent (-681,066km²) - #Antarctic, 4th lowest monthly mean, with 4.7% less extent (-897,973km²) for more: osisaf-hl.met.no/v2p3-sea-ice...

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EUMETSAT OSI SAF @osi-saf.eumetsat.int · 01/10/2025

Cyclones #Humberto and #Imelda are developing in the Atlantic off the US coast. These two nearby low-pressure systems are interacting and will merge, in the rare Fujiwara effect. Last night, #HY-2C captured the two systems in a single swath, allowing our team at @knmi.nl to retrieved the wind.

Wind retrieval displaying the cyclone Umberto and Imelda, as of the 01/10/2025, 00:30 UTC.

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