#osisaf — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #osisaf, aggregated by home.social.
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In June 2026, the #SeaIce global extent was 7.1% below 1991-2020 mean. Since the beginning of records (november 1978):
- #Arctic, 6th lowest monthly mean, with -5.0% less extent than normal (-567,575 km²)
- #Antarctic, 6th lowest monthly mean, with -8.3% less exent than normal (-1,141,933 km²) -
In June 2026, the #SeaIce global extent was 7.1% below 1991-2020 mean. Since the beginning of records (november 1978):
- #Arctic, 6th lowest monthly mean, with -5.0% less extent than normal (-567,575 km²)
- #Antarctic, 6th lowest monthly mean, with -8.3% less exent than normal (-1,141,933 km²) -
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 than normal (-575,397km²)
- #Antarctic, 7th lowest monthly mean, with 8.7% less extent than normal (-923,279km²) -
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 than normal (-575,397km²)
- #Antarctic, 7th lowest monthly mean, with 8.7% less extent than normal (-923,279km²) -
Work-related: if you are curious about @osi_saf plans to transition their #seaice products from #AMSR2 to #AMSR3 over the summer, please visit https://osi-saf.eumetsat.int
In particular this page:
https://osi-saf.eumetsat.int/community/stories/implications-amsr2-being-replaced-amsr3-osi-saf-productsAnd yes, worth noting that #OSISAF is on Mastodon. Thank you @gwenbras !
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Work-related: if you are curious about @osi_saf plans to transition their #seaice products from #AMSR2 to #AMSR3 over the summer, please visit https://osi-saf.eumetsat.int
In particular this page:
https://osi-saf.eumetsat.int/community/stories/implications-amsr2-being-replaced-amsr3-osi-saf-productsAnd yes, worth noting that #OSISAF is on Mastodon. Thank you @gwenbras !
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In April 2026, the Sea-Ice global extent was 6.7% below 1991-2020 mean. Since the beginning of records (1978):
- #arctic 2rd lowest monthly mean, with 4.8% less extent than normal (-692,385km²)
- #antarctic 11th lowest monthly mean, with 9.7% less extent than normal (-704,134km²)For more, check the latest version of our Sea Ice Index, operational since yesterday (04/05/2026) on https://osi-saf.eumetsat.int/sea-ice-index
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In April 2026, the Sea-Ice global extent was 6.7% below 1991-2020 mean. Since the beginning of records (1978):
- #arctic 2rd lowest monthly mean, with 4.8% less extent than normal (-692,385km²)
- #antarctic 11th lowest monthly mean, with 9.7% less extent than normal (-704,134km²)For more, check the latest version of our Sea Ice Index, operational since yesterday (04/05/2026) on https://osi-saf.eumetsat.int/sea-ice-index
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In March 2026, the #SeaIce global extent was 6.8% below 1991-2020 mean. Since the beginning of records (1978):
- #Arctic, 1st lowest monthly mean, with 5.7% less extent than normal (-856,735km²)
- #Antarctic, 14th lowest monthly mean, with -10.1%> less exent than normal(-441,262km²) -
In March 2026, the #SeaIce global extent was 6.8% below 1991-2020 mean. Since the beginning of records (1978):
- #Arctic, 1st lowest monthly mean, with 5.7% less extent than normal (-856,735km²)
- #Antarctic, 14th lowest monthly mean, with -10.1%> less exent than normal(-441,262km²) -
In february 2026, the #SeaIce global extent was 4.5% below 1991-2020 mean. Since the beginning of records (1978):
- #Arctic, 3rd lowest monthly mean, with 4.8% less extent than normal (-712,597km²)
- #Antarctic, 26th lowest monthly mean, with 3.1% less extent than normal (-105,212km²)for more: https://osi-saf.eumetsat.int/sea-ice-index
#ClimateChange #OSISAF @eumetsat -
In february 2026, the #SeaIce global extent was 4.5% below 1991-2020 mean. Since the beginning of records (1978):
- #Arctic, 3rd lowest monthly mean, with 4.8% less extent than normal (-712,597km²)
- #Antarctic, 26th lowest monthly mean, with 3.1% less extent than normal (-105,212km²)for more: https://osi-saf.eumetsat.int/sea-ice-index
#ClimateChange #OSISAF @eumetsat -
In January 2026, the #SeaIce global extent was 6.7% below/over 1991-2020 mean. Since the begining of records (1978):
- #Arctic, 3rd lowest monthly mean, with 5.5% less extent than normal (-769,999km²)
- #Antarctic, 18th lowest monthly mean, with 8.3% less exent than normal (-451,325km²) -
In January 2026, the #SeaIce global extent was 6.7% below/over 1991-2020 mean. Since the begining of records (1978):
- #Arctic, 3rd lowest monthly mean, with 5.5% less extent than normal (-769,999km²)
- #Antarctic, 18th lowest monthly mean, with 8.3% less exent than normal (-451,325km²) -
In November 2025, the #SeaIce global extent was 8.7% below 1991-2020 mean. Since the beginning of records (1978):
- #Arctic, 2nd lowest monthly mean, with 11.7% less extent than normal (-1,198,440km²)
- #Antarctic, 4th lowest monthly mean, with 7.3% less extent than normal (-1,188,737 km²)
more: https://osi-saf.eumetsat.int/sea-ice-index
#ClimateChange #OSISAF @eumetsat -
In November 2025, the #SeaIce global extent was 8.7% below 1991-2020 mean. Since the beginning of records (1978):
- #Arctic, 2nd lowest monthly mean, with 11.7% less extent than normal (-1,198,440km²)
- #Antarctic, 4th lowest monthly mean, with 7.3% less extent than normal (-1,188,737 km²)
more: https://osi-saf.eumetsat.int/sea-ice-index
#ClimateChange #OSISAF @eumetsat -
In August 2025, the #SeaIce global extent was 8.4% below 1991-2020 mean. Since the beginning of records (November 1978):
- #Arctic, 8th lowest monthly mean, with 12,2% less extent than normal (-823 904km²)
- #Antarctic, 3rd lowest monthly mean, with 6.9% less exent than normal (-1 264 062km²) -
In August 2025, the #SeaIce global extent was 8.4% below 1991-2020 mean. Since the beginning of records (November 1978):
- #Arctic, 8th lowest monthly mean, with 12,2% less extent than normal (-823 904km²)
- #Antarctic, 3rd lowest monthly mean, with 6.9% less exent than normal (-1 264 062km²) -
Like for the MSG product, the MTG product is a level 3, hourly, sub-skin Sea Surface Temperature derived from Meteosat at 0° longitude, covering 60S-60N and 60W-60E and re-projected on a 0.05° regular grid, in GHRSST compliant netCDF format.
The MTG product benefits from the higher temporal and spatial resolution of MTG, but the output files have the same temporal and spatial sampling as the MSG product.
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Like for the MSG product, the MTG product is a level 3, hourly, sub-skin Sea Surface Temperature derived from Meteosat at 0° longitude, covering 60S-60N and 60W-60E and re-projected on a 0.05° regular grid, in GHRSST compliant netCDF format.
The MTG product benefits from the higher temporal and spatial resolution of MTG, but the output files have the same temporal and spatial sampling as the MSG product.
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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 than normal (-906.931 km²)
- #Antarctic, 3rd lowest monthly mean, with 8.3% less exent than normal (-1.363.243 km²)
For more: https://osisaf-hl.met.no/v2p2-sea-ice-index
#ClimateChange #OSISAF @eumetsat -
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 than normal (-906.931 km²)
- #Antarctic, 3rd lowest monthly mean, with 8.3% less exent than normal (-1.363.243 km²)
For more: https://osisaf-hl.met.no/v2p2-sea-ice-index
#ClimateChange #OSISAF @eumetsat -
In June 2025, the #SeaIce global extent was 7.9% below 1991-2020 mean. Since the begining of record (november 1978):
- #Arctic, 2th lowest June monthly mean, with 6.4% less extent than normal (-733 404km²)
- #Antarctic, 3th lowest June monthly mean, with 9.1% less exent than normal (-1 255 507km²) -
In June 2025, the #SeaIce global extent was 7.9% below 1991-2020 mean. Since the begining of record (november 1978):
- #Arctic, 2th lowest June monthly mean, with 6.4% less extent than normal (-733 404km²)
- #Antarctic, 3th lowest June monthly mean, with 9.1% less exent than normal (-1 255 507km²) -
What an almost pleasant behavior of the global sea-ice extent
- almost reaching the bottom line (=previous minimum extents) from below.Source: #OSISAF
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What an almost pleasant behavior of the global sea-ice extent
- almost reaching the bottom line (=previous minimum extents) from below.Source: #OSISAF
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The ocean sector offshore of Queen Maud Land in #Antarctic lacks about 1 million km² of sea-ice cover compared to normal conditions.
The sea-ice extent has been dropping fast the recent days...📉
Source: #OSISAF
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The ocean sector offshore of Queen Maud Land in #Antarctic lacks about 1 million km² of sea-ice cover compared to normal conditions.
The sea-ice extent has been dropping fast the recent days...📉
Source: #OSISAF
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The ***slower freeze-up of Arctic sea ice*** is also seen in the time series of the sea-ice extent which at present is the 7th-lowest for this time of year and far below the climatology 1981-2010.
Source: #OSISAF sea-ice index v2.2
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The ***slower freeze-up of Arctic sea ice*** is also seen in the time series of the sea-ice extent which at present is the 7th-lowest for this time of year and far below the climatology 1981-2010.
Source: #OSISAF sea-ice index v2.2
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Halfway through October 2023, the freeze-up of sea ice is slower (or simply just lower) than normal.
By "normal", is meant the 30-year climatology of the same days in 1981-2010.
Source: #OSISAF sea-ice concentration v3.0
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Halfway through October 2023, the freeze-up of sea ice is slower (or simply just lower) than normal.
By "normal", is meant the 30-year climatology of the same days in 1981-2010.
Source: #OSISAF sea-ice concentration v3.0
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Global sea-ice extent ranked by month.
Do you see a pattern for the recent years (=bottom of the figure)? 🧐
Source: #OSISAF sea-ice index v2.2.
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Global sea-ice extent ranked by month.
Do you see a pattern for the recent years (=bottom of the figure)? 🧐
Source: #OSISAF sea-ice index v2.2.
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The whole thread is worth reading, but the discussion below about #SeaIce datasets and #Osisaf is very interesting for those of us who run and/or use #CimateModels for the #Arctic....
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The whole thread is worth reading, but the discussion below about #SeaIce datasets and #Osisaf is very interesting for those of us who run and/or use #CimateModels for the #Arctic....
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Antarctic sea-ice extent has started to decrease after an extremely low winter maximum. Let's hope for a really slow decrease at least🤞
Source: #OSISAF -
Antarctic sea-ice extent has started to decrease after an extremely low winter maximum. Let's hope for a really slow decrease at least🤞
Source: #OSISAF -
For a week, September 12th has marked the date with the largest #Antarctic #seaice extent in 2023.
This is absolutely record-low for an Antarctic maximum extent!This still can change and we hope it will 🤞
Source: #OSISAF Sea Ice Index v2.2
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For a week, September 12th has marked the date with the largest #Antarctic #seaice extent in 2023.
This is absolutely record-low for an Antarctic maximum extent!This still can change and we hope it will 🤞
Source: #OSISAF Sea Ice Index v2.2
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Has the #Antarctic #seaice stopped growing in extent this winter?
Source: #OSISAF
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Has the #Antarctic #seaice stopped growing in extent this winter?
Source: #OSISAF
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Negligible differences when calculating latitude in two different ways.
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Negligible differences when calculating latitude in two different ways.
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As we approach the annual minimum of #Arctic #seaice extent for 2023, it looks like it will be one of the six lowest on record.
To put it in perspective, the years with lower minimums than this year (in order from lowest to highest) are 2012, 2020, 2007, 2016, and 2019.
Source: #OSISAF Sea Ice Index v2.2
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As we approach the annual minimum of #Arctic #seaice extent for 2023, it looks like it will be one of the six lowest on record.
To put it in perspective, the years with lower minimums than this year (in order from lowest to highest) are 2012, 2020, 2007, 2016, and 2019.
Source: #OSISAF Sea Ice Index v2.2
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No surprise. But still crazy.
#Antarctic #SeaIce extent is low.
This graphic shows the ranking of sea-ice extent by month. Take a look at the last line (representing 2023 and updated including August).
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No surprise. But still crazy.
#Antarctic #SeaIce extent is low.
This graphic shows the ranking of sea-ice extent by month. Take a look at the last line (representing 2023 and updated including August).
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#Arctic #SeaIce extent was 9th lowest in August (#OSISAF).
With only 2 weeks left of the melt season, we are not heading towards a record minimum this year.
Still, the 📉 trend is clear: since 1978, #satellites recorded an average loss of 70,000 km2 of ice *per year*.
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#Arctic #SeaIce extent was 9th lowest in August (#OSISAF).
With only 2 weeks left of the melt season, we are not heading towards a record minimum this year.
Still, the 📉 trend is clear: since 1978, #satellites recorded an average loss of 70,000 km2 of ice *per year*.
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📢 #Antarctic #SeaIce extent was *record low* in August according to #osisaf
We are missing 2 millions km2 of sea ice compared to the 1981-2010 climatology.
The end of winter is approaching in the #Antarctic: soon the Sun will warm the ocean and melt the ice 😭 .
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📢 #Antarctic #SeaIce extent was *record low* in August according to #osisaf
We are missing 2 millions km2 of sea ice compared to the 1981-2010 climatology.
The end of winter is approaching in the #Antarctic: soon the Sun will warm the ocean and melt the ice 😭 .