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osi-saf.eumetsat.int
EUMETSAT OSI SAF
@osi-saf.eumetsat.int
760 followers 100 following 92 posts
EUMETSAT's Ocean and Sea Ice Satellite Application Facility. 🛰
We are the dedicated @eumetsat.bsky.social centre for processing satellite data at the ocean-atmosphere interface.
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osi-saf.eumetsat.int
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
October 29, 2025 at 3:14 PM
osi-saf.eumetsat.int
OSI SAF's team is getting ready for the fair of opportunity at the @eumetsat.int #climate symposium.
Come and meet us there!
October 28, 2025 at 9:18 AM
osi-saf.eumetsat.int
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)
October 17, 2025 at 12:34 PM
osi-saf.eumetsat.int
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...
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)
October 2, 2025 at 8:32 AM
osi-saf.eumetsat.int
On this view, the winds are overimposed on GOES-19 data. Check our notebooks to learn how to do this type of image : gitlab.eumetsat.int/eumetlab/oce...
October 1, 2025 at 3:53 PM
osi-saf.eumetsat.int
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.
October 1, 2025 at 3:26 PM
osi-saf.eumetsat.int
Our team is actively taking part in the #Ocean thematic of @eumetsat.int 2025 satellite conference. More to come in the Sea-Ice session!
OSI SAF team at EUMETSAT2025 Ocean Panel session at EUMETSAT2025 OSI SAF presentation during user's session at EUMETSAT2025 OSI SAF team at EUMETSAT2025
September 18, 2025 at 7:45 AM
osi-saf.eumetsat.int
In August 2025, the #SeaIce global extent was 8.4% below 1991-2020 mean. Since the begining of record (1978):
- #Arctic, 8th lowest monthly mean, with 12% less extent (-823.904km²)
- #Antarctic, 3rd lowest monthly mean, with 7% less exent (-1.264.062km²)

for more: osisaf-hl.met.no/v2p3-sea-ice...
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)
September 2, 2025 at 12:17 PM
osi-saf.eumetsat.int
Next week, on Tuesday 02/09/2025, our #ocean #wind #scatterometer retrieval team at @knmi.nl will explain all you need to know about these products 🌬️🛰️ from the catalogue of @osi-saf.eumetsat.int
and @copernicusmarine.bsky.social .
Don't forget to register on: eumetsat.zoom.us/webinar/regi...
August 26, 2025 at 8:35 AM
osi-saf.eumetsat.int
On Tuesday 02/09/2025, our #ocean #wind #scatterometer retrieval team at @knmi.nl will explain all you need to know about these satellite products 🌬️🛰️ from the catalogue of @osi-saf.eumetsat.int and @copernicusmarine.bsky.social.
Register now to this free seminar: eumetsat.zoom.us/webinar/regi...
Ocean Surface Scatterometer Winds webinar. Two sessions available on 02/09/2025 at 08:00UTC or 13:00UTC
August 14, 2025 at 7:26 AM
osi-saf.eumetsat.int
MTG-I1, now called Meteosat-12, has become in June the prime geostationary satellite in 0°.
EUMETSAT OSI SAF is now proud to distribute the Sea Surface Temperature derived from MTG data.
@eumetsat.int @eumetsat-users.bsky.social
First pre-operational output of the Level 3 MTG/FCI Sea Surface Temperature 07/08/2025 at 09:00Z EUMETSAT OSI SAF OSI-206-c, licensed under CC BY 4.0 (free and unrestricted) by EUMETSAT, 10.15770/EUM_SAF_OSI_NRT_2026
August 7, 2025 at 3:08 PM
osi-saf.eumetsat.int
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...
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)
August 1, 2025 at 11:41 AM
osi-saf.eumetsat.int
#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
Northern hemisphere Sea Ice Index values up to 30/07/2025
July 30, 2025 at 1:08 PM
osi-saf.eumetsat.int
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...
Ocean Surface Scatterometer Winds webinar. Two session available on 02/09/2025 at 08:00UTC or 13:00UTC
July 17, 2025 at 9:56 AM
osi-saf.eumetsat.int
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...
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)
July 9, 2025 at 10:04 AM
osi-saf.eumetsat.int
🛰️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...
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
July 4, 2025 at 1:24 PM
osi-saf.eumetsat.int
🚧Urgent notice to all SSMIS product users 🚧

We've just been informed that #SSMIS from the US #DMSP satellite will stop to be distributed on Monday 30/06/2025.
Consequently, we advise SSMIS only-based #SeaIce products users to urgently change.

More information:
osi-saf.eumetsat.int/community/st...
June 25, 2025 at 1:56 PM
osi-saf.eumetsat.int
One can meet a lot of people in #LPS25 : here a random meeting between Stewart Turner, the EUMETSAT Member States representative in our Steering Group and @gwenbras.bsky.social, our communication officer in front of a #Sentinel-6 model. Look for us, and you'll meet us!
Stewart Turner and Gwenaël Le Bras in front of a Sentinel-6 model.
June 23, 2025 at 1:03 PM
osi-saf.eumetsat.int
On sunday, don't miss our tutorial on satellite data on Sunday 22nd afternoon (17h CET, room 1.61/1.62).
We'll present you how satellite data can help to address the 10 Ocean Challenges identified by
@unoceandecade.bsky.social.

#LPS25 🛰️
June 20, 2025 at 10:24 AM
osi-saf.eumetsat.int
🛰️Are you planning to attend the #LPS25? 🌎

Our project team will be represented in Vienna. Make sure to meet us at the @eumetsat.int booth !
June 20, 2025 at 10:24 AM
osi-saf.eumetsat.int
For those attending @esa.int #LivingPlanetSymposium, come to our tutorial on satellite data on Sunday 22nd afternoon (17h CET, room 1.61/1.62).
We'll present you how satellite data can help to address the 10 Ocean Challenges identified by @unoceandecade.bsky.social.

#LPS25 🛰️
TUTORIAL Satellite data for the UN Ocean Decade: addressing the 10 “ocean challenges” with marine data from the Copernicus Programme and EUMETSAT Sunday 22/06/2025 – 17:00-18:20 room 1.61/1.62
June 11, 2025 at 1:28 PM
osi-saf.eumetsat.int
In May 2025, the #SeaIce global extent was 6.51% below 1981-2010 mean. Since the begining of record (1978):
- #Arctic, 9th lowest monthly mean, with 4.84% less extent (-645 639km²)
- #Antarctic, 5th lowest monthly mean, with 8.62% less exent (-906 481km²)

for more: osisaf-hl.met.no/v2p2-sea-ice...
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 1978 (each year is represented with a curve fof a different color)
June 3, 2025 at 9:16 AM
osi-saf.eumetsat.int
Our #seaice team has developed a Sea Ice Index, online since several years, at osisaf-hl.met.no/v2p2-sea-ice.... It offers visuals of the trends and evolution of sea ice at hemispheric, global and regional scales. It includes the sea-ice extent and area since 1978, and is continuously updated.
Sea-Ice extent daily data visualised on a year-long graphic. Each year since 1979 are displayed in a different color. On the left side, the graph for the Arctic display the regular decrease of ice coverage in the northern hemisphere. On the right one, one can see the trend is not that clear, but the last few years are dramatically low.
May 7, 2025 at 3:46 PM
osi-saf.eumetsat.int
On last tuesday (04/03/2025), we released a new version of our Sea Ice Emissivity (OSI-404-b) and of our Global Low Resolution Sea Ice Drift (OSI-405-d) products.
For more details about the new version, consult the product description page :

osi-saf.eumetsat.int/products/sea...
OSI SAF Sea Ice Emissivity quicklook for the 06/03/2025 OSI SAF Sea Ice Emissivity quicklook for the 06/03/2025
March 7, 2025 at 4:01 PM
osi-saf.eumetsat.int
✊ STAND UP FOR SCIENCE ✊

The OSI SAF supports the movement Stand Up for Science France, launched in solidarity with the worldwide scientific community, and most particularly our colleagues in the USA who suffer unprecedented attacks.

#standupforscience #sciencelibre
Sea Ice Concentration Anomaly of February 2025 and banner of the movement Stand Up for Science France, launched in support with our USA colleagues.
March 6, 2025 at 4:19 PM