EUMETSAT OSI SAF

Map showing the Antarctic anomaly of the July 2025 sea-ice concentration relative to the mean July ice concentration in 1981-2010. Especially, the sea ice around the Antarctic Peninsula, and in the King Haakon VII sea, shows large areas of negative anomaly (red colour). Source data is OSI SAF sea-ice concentration CDR v3.0.

The line graph displays the monthly sea-ice extent in the Antarctic for July from 1979 to 2025. In 2025, the July extent ranked as the third lowest on record. Source data is OSI SAF sea-ice index.

Disregarding the extreme and record-low sea-ice extent in Antarctic the last two years, this year's July extent is exceptionally low, ranking as the 3rd lowest on record.

The July extent over the last four years differs significantly from that of the previous four decades.

@osi-saf.eumetsat.int

With the announcement that the U.S. SSMIS data will continue to be distributed after 31 July, the Sea-Ice Index will continue to be produced as usual, based on SSMIS-derived sea-ice concentration, but our plan remains to upgrade the index with data from on the alternative sensor AMSR2. Stay tuned!

Until 31 July 2025, the Sea-Ice Index was based on our Sea-Ice Concentration Interim Climate Data Record using SSMIS. Last 16 days are based on the fast-track data generated faster than the nominal ones, that may differ slightly.
More information on: osi-saf.eumetsat.int/products/osi...

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)

In July 2025, the #SeaIce global extent was 8.9% below 1991-2020 mean. Since the beginning of records (1978):
- #Arctic, 4th lowest monthly mean, with 9.9% less extent (-906.931 km²)
- #Antarctic, 3rd lowest monthly mean, 8.3% less exent (-1.363.243 km²)
For more: osisaf-hl.met.no/v2p2-sea-ice...

The EUMETSAT Climate Symposium is from 28–30 October 2025.
The event will take place at darmstadtium Science and Congress Center in the heart of Darmstadt, Germany, 30km south of Frankfurt.
Register now to join us & celebrate 25 years of Climate@EUMETSAT: www.eventsforce.net/eumetsat/fro...

Check this post about the steps to adapt our Sea-Ice Index !
bsky.app/profile/sign...

For information about our other SSMIS products: osi-saf.eumetsat.int/community/st...

Northern hemisphere Sea Ice Index values up to 30/07/2025

#SSMIS data-end grows close. Our #SeaIce team has been busy this summer to ensure product continuity.
Our Sea Ice Index will be updated from v2.2 (SSMIS based) to v2.3 ( #AMSR2 based) from Friday 01/08/2025 on.
more on: osi-saf.eumetsat.int/community/li...
#climate #arctic #antarctic

Line graph showing sea-ice extent in 2025 for the Northern Hemisphere. In blue is the original sea-ice index (SII) v2.2, which is based on SSMIS. In orange is the similar SII based on AMSR-2 instead. And in red is the calibrated AMSR-based SII, which will be used to extend the SII from August 2025. Source: OSI SAF Sea-index (OSI-420)

How do we at @osi-saf.eumetsat.int prepare the Sea-Ice Index for the potential End-of-Life of SSMIS after July?

1. Compute indexes from AMSR-2 instead
2. Develop a calibration tuned over 2021-2025
3. Continue the index time series with calibrated AMSR-based indexes from August 2025.

👉 (link below)

More information on: classroom.eumetsat.int/course/view....
cc: @eumetsat.int @copernicusecmwf.bsky.social‬ @hayleyeversking.bsky.social @gwenbras.bsky.social

Ocean Surface Scatterometer Winds webinar. Two session available on 02/09/2025 at 08:00UTC or 13:00UTC

Are you using #scatterometer retrieval of #ocean #wind from @osi-saf.eumetsat.int or @copernicusmarine.bsky.social, or planning to?
On Tuesday 02/09/2025, our @knmi.nl specialists will answer all your questions about these satellite products 🌬️🛰️
register on: eumetsat.zoom.us/webinar/regi...

An event card with the text: Climate Symposium; From space to climate services: co-creation in action; Darmstadt, Germany, 28-30 October 2025

Have you registered to join us & celebrate 25 years of Climate@EUMETSAT, 28–30 Oct 2025?
Contributions include the UN Climate Change Secretariat, @copernicusecmwf.bsky.social & @esa.int

A great opportunity for you to help shape the future of climate services: www.eventsforce.net/eumetsat/fro...

Our wind team at @knmi.nl host the activities of Frederico Cossu from the @icmcsic.bsky.social . He has been working on ocean surface return polarization of radar signal.
Learn more reading this story on our website:
osi-saf.eumetsat.int/community/st...

A large polynya has developed northeast of Greenland.
This is clearly visible in the new AMSR-based sea-ice concentration product (OSI-438), but is less visible in the SSMIS-based product (OSI-430) due to its lower spatial resolution.
🧪🌊🥼❄️

If you wonder what difference are between our AMSR-2 based and our SSMIS based Sea Ice concentration products, check this post from @signeaaboe.bsky.social

Come and meet our team at @eumetsat.int satellite conference in Lyon!

MTG-S1 is on its way to geostationary orbit! 🚀
Launched on 1 Jul the satellite is now undergoing a complex 17-day journey to reach its new home 36,000km above Earth.
Julia Hunter-Anderson shares how her team's guiding it through space from Telespazio Mission Control Centre.
Read more: bit.ly/3IH6Edn

Hayley Evers-King presenting in front of a satellite image of a coastline

ICYMI: Our Lead Marine Expert Hayley Evers-King spoke at #UNOC in June about what ocean colour tells us - from water quality to #ClimateChange. 🌊🛰️

DYK satellites like Sentinel-3 help us spot the good, the bad, and the ugly from space? Watch here: bit.ly/4606uYy

An event card with the text: Climate Symposium; From space to climate services: co-creation in action; Darmstadt, Germany, 28-30 October 2025

⚠️Deadline extended to Friday 11 July!

A limited amount of financial support is available to help participants join us, celebrate 25 years of Climate@EUMETSAT and shape the future of climate services.

Applications for support can be made during registration: www.eventsforce.net/eumetsat/fro...

Following the end of production of the US DMSP's SSMIS production end, we are currently working on a replacement Interim Data Record based on the Jaxa's AMRS-2 instrument. Our Sea Ice Index will soon be kept up to date with these data.

more on: osi-saf.eumetsat.int/community/st...

The Sea-Ice Index is based on our Sea Ice Concentration Interim Data Record using SSMIS. Last 16 days are based on the fast-track data generated faster than the nominal ones, that may differ slightly.

More on:
osi-saf.eumetsat.int/products/osi...

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

Graph showing the Antarctic Sea Ice Extent daily value for each year since 1979 to the 08/07/2025 (each year is represented with a curve fof a different color)

In June 2025, the #SeaIce global extent was 7.9% below 1991-2020 mean. Since the begining of record (1978):
- #Arctic, 2th lowest monthly mean, with 6.4% less extent (-733 404km²)
- #Antarctic, 3th lowest monthly mean, with 9.1% less exent (-1 255 507km²)

for more: osisaf-hl.met.no/v2p2-sea-ice...

❄️ June 2025: Arctic sea ice extent 6% below average, 2nd lowest June in the satellite record. Antarctic extent 9% below average, 3rd lowest on record for month. Full sea ice highlights in the #C3S bulletin: climate.copernicus.eu/sea-ice-cove...

@osi-saf.eumetsat.int

Thanks @signeaaboe.bsky.social for taking care ot if <3

📣 Note - Are you using sea-ice concentration climate data from OSI SAF,

please be aware

that an AMSR-2-based product is now being released

to replace the SSMIS-based product (soon end-of-life) 👉

OSI SAF Sea Ice Concentration ICDR from AMSR-2 (OSI-438) for the 18/06/2025 - Northern Hemisphere

OSI SAF Sea Ice Concentration ICDR from AMSR-2 (OSI-438) for the 18/06/2025 - Southern Hemisphere

🛰️New Product ! 🛰️
Our #SeaIce team at @met.no and @dmidk.bsky.social
has been working hard to ensure you reliable and lasting access to sea ice concentration Climate Data Record.
Today we release as demonstrational a new #AMSR-2 based Interim CDR (OSI-438)

osi-saf.eumetsat.int/community/li...

If you are using our climate data and wish to learn more about the satellite climate data available, join @eumetsat.int Climate symposium next October!

WHAT...A...LAUNCH! 🚀

We're thrilled at yesterday's successful MTG-S1 & Copernicus Sentinel-4 launch, a huge congrats to all teams & partners involved 👏

MTG-S1 will deliver vital atmospheric data for earlier, more accurate warnings - helping protect lives & infrastructure.

📷 Images by SpaceX

Rocket on launch pad. Blue skies in the background and water in the foreground.

🔴 NOW LIVE! Launch coverage of the second of the Meteosat Third Generation satellites and the first instrument for the Copernicus Sentinel-4 mission.

Watch live on esawebtv.esa.int.

🚀 Liftoff with SpaceX on Falcon 9 is expected at 23:03 CEST.

Live in 1️⃣ hour!

Join us for a front-row seat to the MTG-S1 story 15 years in the making.

The satellite is now ready with Falcon 9 on the pad for launch. 🚀

Want to join in the fun? Use #MTGS1 - your msg could appear on our in-house social wall 📽️

ESA/SpaceX