Signals flashing red indicating further acceleration toward climate collapse

Greenhouse gas concentrations

Carbon dioxide (CO₂) average daily concentrations were at a record high of 431.95 parts per million (ppm), at Mauna Loa, Hawaii, on March 28, 2026. The image below shows daily (green circles), weekly (red lines) and monthly (blue lines) averages for the last year. The weekly average for the week beginning on March 22, 2026 was 430.67 ppm (red line top right).

The image below shows hourly (red circles) and daily (yellow circles) averaged CO₂ values from Mauna Loa, Hawaii, over the last 31 days. The highest daily average CO₂ concentration on record, 431.95 ppm, was recorded at Mauna Loa, Hawaii, on March 28, 2026 (yellow circle on the right). The green inset shows daily averages since March 24, 2026. 

The image below shows daily average CO₂ concentration at Mauna Loa, Hawaii since 2020. The highest daily average CO₂ concentration on record, 431.95 ppm, was recorded at Mauna Loa, Hawaii, on March 28, 2026.

Concentrations of carbon dioxide haven't been this high for millions of years, as confirmed by recent analysis led by Sarah Shackleton and Julia Marks-Peterson. Their analysis finds that, while the average temperature of the ocean has decreased by 2 to 2.5°C over the past 3 million years, average atmospheric carbon dioxide levels have likely remained below 300 parts per million over this time. Methane levels have also remained relatively stable. This makes the recent daily concentration of 431.95 ppm at Mauna Loa and the high recent methane levels (see image below) even more threatening and it means that, in addition to the key role of heat-trapping greenhouse gases, there were important contributions from other components of the climate system such as Earth’s reflectivity, variations in vegetation and/or ice cover and ocean circulation.

[ click on images to enlarge ]

The above combination image shows methane levels as high as 2240 parts per billion (ppb) close to sea level (left panel, 1000 mb) and as high as 2541 ppb at a slightly higher altitude (right panel, 840 mb) recorded by the NOAA 21 satellite on March 11, 2026 AM.

Sea surface temperature

The image below shows world (60°S–60°N, 0–360°E) sea surface temperatures from NOAA OISST V2.1. The sea surface temperature was 21.15°C on March 27, 2026, a record high temperature for the time of year and a +0.75°C anomaly compared to 1982-2010. The sea surface temperature has risen by 0.46°C since the start of 2026.

Furthermore, changes in salinity and ocean currents, together with ocean stratification, ocean oxygen depletion and sea ice loss can result in oceans changing from heat sinks into heat sources, resulting in more heat remaining in the air and getting transferred to the air, as discussed in earlier post such as this one and as discussed in this analysis, also discussed here.

Earth Albedo

The image below, adapted from an image by Eliot Jacobson, shows now much the Earth Albedo (reflectivity) has fallen from February 23 through January 2026.

Arctic sea ice

One of the contributors to albedo loss is Arctic sea ice loss. The image below, adapted from NSIDC, shows that on March 25, 2026, the Arctic sea ice extent was 14.011 million km², the lowest extent on record for the time of year.

The image below, adapted from ads.nipr.ac.jp, shows that Arctic sea ice extent was 13.37 million km² on March 27, 2026, the lowest sea ice extent on record for the time of year. 

The situation is very dangerous, since we're moving out of a La Niña (which is suppressing the temperature) into an El Niño (which will be elevating the temperature). 

The danger is that a Blue Ocean Event will occur in 2026 if Arctic sea ice continues to be low and if melting from April 2026 onward will be strong. A Blue Ocean Event can be said to occur when virtually no sea ice remains to keep consuming ocean heat that is entering the Arctic Ocean mainly from the Atlantic Ocean. Virtually no sea ice could be 1 million km² or less in sea ice extent, but it could also be measured in area, as illustrated by the image below.

The image below shows that the Arctic sea ice area was the lowest on record on March 25, 2026. Arctic sea ice area was 13.43 million km² on March 25, 2012, and area was 12.31 million km² on March 25, 2026, i.e. a difference of 1.12 million km² and the same difference as there was on March 20, 2026. Arctic sea ice area was 2.24 million km² on September 12, 2012, so with this difference persisting, Arctic sea ice area would be 1.12 million km² in September 2026, or very close to a Blue Ocean Event.

The danger that a Blue Ocean Event will occur in September 2026 is further illustrated by the image below. The image, from an earlier post, which shows Arctic sea ice volume in the past 25 years. Markers show April (blue) and September (red) volume, corresponding with the year's maximum and minimum. In 2025, Arctic sea ice reached a record low maximum volume, as well as a record low minimum volume.

As illustrated by the above image, adapted from dmi.dk, Arctic sea ice volume was very low in April 2025, so while relatively little melting took place from April 2025 to September 2025, a record low Arctic sea ice volume was still reached in September 2025. The above image shows Arctic sea ice volume through mid February 2026, with an analysis of the strength of the melting between April (annual maximum) and September (annual minimum) by means of the bars colored magenta (strong melting) and green (little melting).

If the downward trend in annual maxima (blue circles) continues, Arctic sea ice looks set to reach an even lower maximum volume in April 2026. The difference between strong melting (magenta) and little melting (green) is 3000 km³, so if strong melting will take place from April 2026, this may well cause a Blue Ocean Event to occur later in 2026. A Blue Ocean Event could also be said to occur when only 1000 km³ or less Arctic sea ice volume remains. The image below, adapted from dmi.dk, shows that Arctic sea ice volume was at a record daily low on March 29, 2026. 

Temperature rise

The image below, adapted from Copernicus, shows that the global surface air temperature was 14.31°C on March 26, 2026, the highest temperature on record for the time of year. 

The upcoming El Niño could trigger a rapid and steep rise in temperature on land, as illustrated by the image below.

[ Could a steep rise in land-only temperatures occur soon? - image from earlier post ]

The danger is that the temperature will not merely "overshoot" the 3°C threshold, but that the temperature on land will continue to rise. Given the severity, ubiquity and imminence of the danger, one would think that highlighting the danger will prompt people into taking effective climate action, but the outlook is that the temperature will continue to rise for the next few years, so the canvas is limited to 3°C and the start of the year 2028 (discussed on facebook here).

Polynomial trends such as the one in the above image can highlight warnings about dangers that are discussed in this post and in earlier posts, i.e. warnings that a strong El Niño may be on the way that could cause a strong rise in temperature in the course of 2026, a rise that would come on top of a temperature rise that is already accelerating due to high concentrations of greenhouse gases, while deforestation and numerous feedbacks are kicking in with greater ferocity, and while the temperature rise is amplified in the Arctic (see image below, from earlier post), which could lead to a Blue Ocean Event soon, further speeding up the temperature rise and resulting in loss of permafrost, eruption of methane from the seafloor of the Arctic Ocean, further loss of lower clouds, etc.

The above image, from an earlier post, shows that the 2025 Arctic temperature was 3.431°C higher than in 1951-1980. The only year on record that had an anomaly higher than 2025 was 2016, when there was a super El Niño.

Climate Emergency Declaration

The situation is dire and unacceptably dangerous, and the precautionary principle necessitates rapid, comprehensive and effective action to reduce the damage and to improve the outlook, where needed in combination with a Climate Emergency Declaration, as described in posts such as in this 2022 post and this 2025 post, and as discussed in the Climate Plan group.

Links

• Broadly stable atmospheric CO2 and CH4 levels over the past 3 million years - by Julia Marks-Peterson et al.
https://www.nature.com/articles/s41586-025-10032-y

• Global ocean heat content over the past 3 million years - by Sarah Shackleton et al.

https://www.nature.com/articles/s41586-026-10116-3
discussed on Facebook at:
https://www.facebook.com/groups/arcticnews?multi_permalinks=10164017885199679

• Earth Albedo - by Eliot Jacobson

https://bsky.app/profile/climatecasino.net/post/3mhgez6jdb226

• NSIDC - Sea Ice Extent
https://nsidc.org/sea-ice-today/sea-ice-tools/charctic-interactive-sea-ice-graph

• Kevin Pluck - sea ice visuals
https://seaice.visuals.earth

• Danish Meteorological Institute - Arctic sea ice volume and thickness
https://ocean.dmi.dk/arctic/icethickness/thk.uk.php

• Copernicus

https://pulse.climate.copernicus.eu

• Blue Ocean Event
https://arctic-news.blogspot.com/p/blue-ocean-event.html

• The threat of seafloor methane eruptions
https://arctic-news.blogspot.com/2025/11/the-threat-of-seafloor-methane-eruptions.html

• The 2026 El Nino - update March 2026 
https://arctic-news.blogspot.com/2026/03/the-2026-el-nino-update-march-2026.html

• Transforming Society
https://arctic-news.blogspot.com/2022/10/transforming-society.html

• Climate Plan
https://arctic-news.blogspot.com/p/climateplan.html

• Climate Emergency Declaration
https://arctic-news.blogspot.com/p/climate-emergency-declaration.html

The 2026 El Nino - update March 2026

The 2026 El Niño

[ click on images to enlarge ]

Moving from the bottom of a La Niña to the peak of a strong El Niño alone can make a difference of more than 0.5°C, as discussed in an earlier post.

The image on the right, adapted from NOAA, shows Niño-3.4 region temperature anomalies and forecasts, indicating that El Niño will emerge in the course of 2026.

The image below, also adapted from NOAA, shows El Niño years (red), La Niña years (blue) and neutral years (grey).

The image on the right, adapted from NOAA, shows ENSO (El Niño-Southern Oscillation) probabilities for the Niño3.4 region (5°N-5°S,120°W-170°W) relative sea surface temperature index, indicating El Niño (red bar) will emerge and strengthen in the course of 2026.

The combination image below, adapted from ECMWF, shows ENSO anomalies and forecasts for developments through February 2027 in Niño3.4 (left panel) and in Niño1+2 (right panel), indicating that the next El Niño will emerge and strengthen in the course of 2026.

[ image from earlier post ]

The combination image below, also adapted from ECMWF, shows anomalies and forecasts through September 2026 in the Niño3.4 region (left panel) and the Niño1+2 region (right panel).

Sea surface temperature anomalies exceeding 2°C in the NINO3.4 region indicate a "super" or very strong El Niño event. 

Zeke Hausfather made the image below based on forecasts by different modeling groups that suggest that we might see an event comparable in strength to what we saw in 2016.

[ click on images to enlarge ]

The image below, adapted from tropicaltidbits.com, shows a rise since early January 2026 of more than 2.5°C in sea surface temperature anomalies (CDAS data) in the Niño1+2 region from early January 2026 to March 1, 2026.

Forests burning

The image below, adapted from Copernicus, shows high levels of carbon dioxide over South America, Central Africa and India on March 14, 2026, indicating massive burning of forests and crop residues. 

Ocean temperatures

During La Niña, heat builds up underneath the sea surface, so sea surface temperatures and air temperatures get suppressed. The image below, adapted from NOAA, illustrates ocean heat building up in the Equatorial Pacific region. 

During El Niño, more ocean heat comes to the sea surface and more ocean heat gets transferred to the atmosphere, resulting in elevated air temperatures. 

The image below shows world (60°S–60°N, 0–360°E) sea surface temperatures from NOAA OISST V2.1. The sea surface temperature was 21.15°C on March 24, 2026, a record high temperature for the time of year and a +0.74°C anomaly compared to 1982-2010. The sea surface temperature has risen by 0.46°C since the start of 2026. 

Furthermore, changes in salinity and ocean currents, together with ocean stratification, ocean oxygen depletion and sea ice loss can result in oceans changing from heat sinks into heat sources, resulting in more heat remaining in the air and getting transferred to the air, as discussed in earlier post such as this one and as discussed in this analysis, also discussed here. The danger is illustrated by the image below. 

[ image from earlier post, discussed on facebook and also at the Arcticnews group on facebook ]

The upcoming El Niño could trigger a rapid and steep rise in temperature. The above image shows ERA5 daily sea surface temperature anomalies (60°S-60°N) from 1 January 2023 through 25 February 2026, with an added trend, warning about the potential for a steep temperature rise in 2026.

The above image shows NASA February 2026 Land+Ocean temperature anomalies as high as 6.6°C with an average of 1.24°C above 1951-1980.

Land-only temperatures

The above image was created with NASA Land Only temperature anomalies versus 1880-1890 (not pre-industrial) through February 2026. The image shows that the 1.5°C threshold was crossed on land for all months since 2022 (black squares). The Lowess 3-year smoothing trend (red line) indicates that the 2°C threshold was crossed on land since 2022. The dashed red line is a linear extension of the red line that indicates that the 3°C threshold may get crossed soon, possibly half 2029 if this linear trend continues (dashed red extension). 

The images below and above focus on land-only temperatures, since virtually all people live on land (rather than oceans), which makes it critical for people to know by how much temperatures could rise on land.

Some suggest that one decade was too short to qualify as a climate period. Climate change generally does take place over many years, as opposed to seasonal changes that take place within a period of one or a few years time, while the weather can change by the hour. Yet, acceleration in the rise in temperature over a short period of time should not be ignored in discussions about climate change and action on climate change.

The image below shows 15 years of NASA Land-Only temperature anomalies versus 1880-1920 (not pre-industrial) with a quartic trend added that points at the 3°C threshold getting crossed in 2027. The trend is calculated over 16 years of data, so when adding 16 years into the future, a trend that has the start of 2026 at its center would cover a 32-year period if extended to the year 2041.

The canvas in the image below shows a yellow trend starting in 2011, with the dashed part for the years 2026 and 2027 constituting an extension of the trend made visible for years for which no annual data are yet available. The canvas of the image is limited to 3°C for the vertical axis and to the start of the year 2028 for the horizontal axis, since humans are likely to go extinct with a 3°C rise. So, while the canvas is limited, the trend actually covers a period of 32 years.

[ Could a steep rise in land-only temperatures occur soon? ]

The danger is that the temperature will not merely "overshoot" the 3°C threshold, but that the temperature will continue to rise. Given the severity, ubiquity and imminence of the danger, one would think that highlighting the danger will prompt people into taking climate action, but no predictions are made and no promises or guarantees can be offered, so it makes sense for the canvas to stop there (discussed on facebook here).

Such trends should not be confused with near-future temperature forecasts or predictions. The image poses questions such as whether a steep rise in land-only temperatures could occur soon. The debate page further discusses whether the danger can best be highlighted using data dating back only a few years, whether linear or non-linear trends should be used, etc.

Polynomial trends such as the one in the above image can highlight warnings about dangers that are discussed in this post and in earlier posts, i.e. warnings that a strong El Niño may be on the way that could cause a strong rise in temperature in the course of 2026, a rise that would come on top of a temperature rise that is already accelerating due to high concentrations of greenhouse gases, while deforestation and numerous feedbacks are kicking in with greater ferocity, and while the temperature rise is amplified in the Arctic, which could lead to a Blue Ocean Event soon, further speeding up the temperature rise and resulting in loss of permafrost, eruption of methane from the seafloor of the Arctic Ocean, further loss of lower clouds, etc.

Arctic temperatures

The above image shows that the 2025 Arctic temperature was 3.431°C higher than in 1951-1980. The only year on record that had an anomaly higher than 2025 was 2016, when there was a super El Niño. 

[ click on images to enlarge ]

The above image shows a sea surface temperature anomaly forecast for August 2026, adapted from tropicaltidbits.com, with sea surface temperature anomalies higher than 5°C showing up over much of the Arctic Ocean. 

The image on the right shows that most forecasts point at a sea surface temperature anomaly exceeding 2°C in the NINO3.4 region in Sept 2026, indicating that a super El Niño event is on the way.

The image below shows a 2-meter temperature anomaly forecast for November 2026, adapted from tropicaltidbits.com, with anomalies at the top end of the scale (13°C) showing up over most of the Arctic Ocean.

[ image from earlier post, click on images to enlarge ]

The image below shows a 2-meter temperature anomaly forecast for December 2026, adapted from tropicaltidbits.com, with very high anomalies again showing up over most of the Arctic Ocean.

Arctic sea ice

The image below, adapted from ads.nipr.ac.jp/vishop, shows that the Arctic sea ice was 13.38 million km² in extent on March 24, 2026, the lowest extent on record for the time of year. 

The image below, adapted from NSIDC, shows that on March 24, 2026, the Arctic sea ice extent was 14.024 million km², the lowest extent on record for the time of year. 

This is a very dangerous situation, since we're moving out of a La Niña (which is suppressing the temperature) into an El Niño (which will be elevating the temperature), as also described in a recent post. 

The image below shows that the Arctic sea ice extent anomaly was 1.38 million km² lower than 1981-2010 on March 22, 2026 (black), the lowest daily anomaly on record and a deviation from 1981-2010 of -3.12σ. Also highlighted is the sea ice extent anomaly for 2016 (blue), when there was a strong El Niño. 

The danger is that a Blue Ocean Event will occur in 2026 if Arctic sea ice continues to be low and if melting from April 2026 onward will be strong. A Blue Ocean Event can be said to occur when virtually no sea ice remains to keep consuming ocean heat that is entering the Arctic Ocean mainly from the Atlantic Ocean. Virtually no sea ice could be 1 million km² or less in sea ice extent, but it could also be measured in area. 

The image below illustrates that the Arctic sea ice area was 13.52 million km² on March 20, 2012, and it was 12.40 million km² on March 20, 2026, i.e. a difference of 1.12 million km². Arctic sea ice area was 2.24 million km² on September 12, 2012, so if this difference persists, Arctic sea ice area would be 1.12 million km² in September 2026, or very close to a Blue Ocean Event.

The danger that a Blue Ocean Event will occur in September 2026 is further illustrated by the image below, which shows Arctic sea ice volume in the past 25 years. Markers show April (blue) and September (red) volume, corresponding with the year's maximum and minimum. In 2025, Arctic sea ice reached a record low maximum volume, as well as a record low minimum volume.

As illustrated by the above image, adapted from dmi.dk, Arctic sea ice volume was very low in April 2025, so while relatively little melting took place from April 2025 to September 2025, a record low Arctic sea ice volume was still reached in September 2025. The above image shows Arctic sea ice volume through mid February 2026, with an analysis of the strength of the melting between April (annual maximum) and September (annual minimum) by means of the bars colored magenta (strong melting) and green (little melting). 

If the downward trend in annual maxima (blue circles) continues, Arctic sea ice looks set to reach an even lower maximum volume in April 2026. The difference between strong melting (magenta) and little melting (green) is 3000 km³, so if strong melting will take place from April 2026, this may well cause a Blue Ocean Event to occur later in 2026. A Blue Ocean Event could also be said to occur when only 1000 km³ or less Arctic sea ice volume remains. The image below, adapted from dmi.dk, shows that Arctic sea ice volume was at a record daily low on March 25, 2026. 

The image below, adapted from Zack Labe, shows sea ice thickness near the North Pole from 1979 through February 2026. 

Greenhouse gas concentration

The highest daily average carbon dioxide (CO₂) concentration on record, 431.89 parts per million (ppm), was recorded at Mauna Loa, Hawaii, on March 24, 2026.

The image below shows one year of daily (green circles), weekly (red lines) and monthly (blue lines) average carbon dioxide concentrations at Mauna Loa, Hawaii. 

Climate Emergency Declaration

The situation is dire and unacceptably dangerous, and the precautionary principle necessitates rapid, comprehensive and effective action to reduce the damage and to improve the outlook, where needed in combination with a Climate Emergency Declaration, as described in posts such as in this 2022 post and this 2025 post, and as discussed in the Climate Plan group.

Proposed amendment to the Constitution

People who see huge environmental dangers have a duty to speak out and politicians have a duty to act. When dangers are confirmed by best-available science, politicians who still fail to act should be immediately replaced and institutionalized until rehabilitated.

Links

• Japanese National Institute of Polar Research
https://ads.nipr.ac.jp/vishop

• NSIDC - Sea Ice Extent
https://nsidc.org/sea-ice-today/sea-ice-tools/charctic-interactive-sea-ice-graph

• Danish Meteorological Institute - Arctic sea ice volume and thickness
https://ocean.dmi.dk/arctic/icethickness/thk.uk.php

• NOAA - Ocean heat in the Equatorial Pacific region

https://www.cpc.ncep.noaa.gov/products/analysis_monitoring/enso_update/wkxzteq.shtml

• NASA - Goddard Institute for Space Studies (GISS) Surface Temperature Analysis
https://data.giss.nasa.gov/gistemp

image discussed on facebook at: 
https://www.facebook.com/SamCarana/posts/pfbid05ToSzQwjjA4indZrf9vDfz4RdbguAjGqB6S96ftBKu68hsUjjqu8X5TqD4kAQZf1l

• Copernicus
https://atmosphere.copernicus.eu/charts/packages/cams

• Zachery Labe - sea ice thickness/volume
https://zacklabe.com/arctic-sea-ice-volumethickness

• Kevin Pluck - sea ice visuals
https://seaice.visuals.earth

• Levi Cowan - tropicaltidbits

https://www.tropicaltidbits.com

• Blue Ocean Event
https://arctic-news.blogspot.com/p/blue-ocean-event.html

• The threat of seafloor methane eruptions
https://arctic-news.blogspot.com/2025/11/the-threat-of-seafloor-methane-eruptions.html

• The 2026 El Nino
https://arctic-news.blogspot.com/2026/02/the-2026-el-nino.html

• Transforming Society
https://arctic-news.blogspot.com/2022/10/transforming-society.html

• Climate Plan
https://arctic-news.blogspot.com/p/climateplan.html

• Climate Emergency Declaration
https://arctic-news.blogspot.com/p/climate-emergency-declaration.html

The 2026 El Nino

Arctic sea ice extent

Arctic sea ice extent was 13.53 million km² on February 28, 2026, the second lowest on record for the time of year. This is a very dangerous situation, as we're moving out of a La Niña that is suppressing temperatures into an El Niño that is elevating temperatures. 

The above image is adapted from the Japanese National Institute of Polar Research and shows Arctic sea ice extent from the start of the year through early May. 

The image below, adapted from NSIDC, shows that Arctic sea ice extent was second lowest on record for the time of year on February 27, 2026. 

As illustrated by the image below, Arctic sea ice extent was 1.36 million km² lower than 1981-2010 on February 27, 2026 (black), the second lowest anomaly on record for the time of year and a deviation from 1981-2010 of -2.96σ. 

Importantly, we're moving from a La Niña to an El Niño. The above images illustrate the impact of differences between El Niño and La Niña. The year 2016 was a strong El Niño year and Arctic sea ice extent started to decline strongly in the course of 2016 and extent remained low in 20017 and 2018. The El Niño that started to develop in 2023 contributed to the very low sea ice extent in early 2025, while sea ice extent was also lowest on record for the day during early parts of 2026. The blue line is the 2012 extent, which would turn into a record low later that year, a record that still stands today. 

What happened in 2012? Let's first look into greenhouse gas concentrations, which are high in the Arctic and causing Arctic temperatures to rise strongly.

[ CO₂ concentration on Feb 22, 2026 ]

As illustrated by the image below, methane concentrations were as high as 2498 ppb on February 19, 2026. Methane tends to be higher closer to the North Pole, while methane is particularly high at this altitude, unlike CO₂ that has its highest concentrations close to the surface.

As illustrated by the image on the right, surface concentration of carbon dioxide (CO₂) was as high as 526 ppm on February 22, 2026. The image also shows that CO₂ concentrations are high across the Arctic.

High Arctic concentrations of greenhouse gases are causing Arctic temperatures to rise strongly, contributing to decline in Arctic ice and snow cover, which causes loss of surface albedo (reflectivity).

Albedo loss is a self-amplifying feedback loop that further speeds up the temperature rise in the Arctic. 

The strong rise of Arctic temperatures narrows the temperature difference between the Equator and the Arctic, which slows down the speed at which hot air flows from the Equator to the Arctic. This slowdown can hugely distort the Jet Stream and can also contribute to a slowdown of ocean currents such as the Atlantic Meridional Overturning Circulation (AMOC), which - together with ocean stratification - can contribute to more ocean heat accumulating at the surface and to less lower clouds (albedo loss).

[ Storm over Arctic Ocean, August 2012 ]

Distortion of the Jet Stream in turn results in more extreme weather such as heatwaves, storms and fires. Fires produce soot that can settle down on the snow and ice cover and darken the surface (albedo loss). Storms can bring huge amounts of warm air into the Arctic. Furthermore, storms can churn sea ice into smaller pieces.

Early August 2012, a storm hit the Arctic Ocean, as illustrated by the image on the right. Smaller pieces of ice melt more rapidly, since more parts become exposed to ocean heat, in contrast to a large flat and solid layer of ice that is also less susceptible to wind. 

Pieces of ice that are lighter and smaller will more easily stand out above the water and capture the wind like the sails of yachts. Storms can push these smaller pieces more easily together, decreasing sea ice extent (albedo loss). 

Storms can also temporarily speed up currents that are moving pieces of sea ice, with the potential to move pieces all the way out of the Arctic Ocean, where they will melt away rapidly. 

Furthermore, storms can cause deeper vertical mixing of the sea water column, causing more heat to penetrate the seabed and resulting in destabilization of hydrates contained in sediments and eruption of huge amounts of methane from hydrates and from free gas held underneath the hydrates. 

In conclusion, a huge retreat in Arctic sea ice extent could occur in 2026, as Jet Stream distortion is getting ever stronger due to the ongoing temperature rise and this can cause storms over the Arctic Ocean to devastate sea ice extent. A Blue Ocean Event could therefore happen in the course of 2026. 

The 2026 El Niño
 
During La Niña, heat builds up underneath the sea surface, so sea surface temperatures and air temperatures get suppressed. During El Niño, ocean heat comes to the sea surface and air temperatures are elevated.

The image below shows ERA5 daily sea surface temperature anomalies (60°S-60°N) from 1 January 2023 through 25 February 2026, with an added trend, warning about the potential for a steep temperature rise in 2026.

[ the image is discussed at Arcticnews on facebook ]

[ El Niño outlook ]

Moving from the bottom of a La Niña to the peak of a strong El Niño alone can make a difference of more than 0.5°C, as discussed in an earlier post.

The image on the right, adapted from NOAA, shows Niño-3.4 region temperature anomalies and forecasts, indicating that El Niño will emerge in the course of 2026. 

The image below, also adapted from NOAA, shows El Niño years (red), La Niña years (blue) and neutral years (grey).

[ image from earlier post ]

[ image from earlier post, click on images to enlarge ]

The image on the right, adapted from NOAA, shows ENSO (El Niño-Southern Oscillation) probabilities for the Niño3.4 region (5°N-5°S,120°W-170°W) relative sea surface temperature index, with El Niño (red bar) emerging in the course of 2026.

The combination image below, adapted from ECMWF, shows ENSO anomalies and forecasts for developments through February 2027 in Niño3.4 (left panel) and in Niño1+2 (right panel), indicating that the next El Niño will emerge and strengthen in the course of 2026.

[ image from earlier post ]

The combination image below, also adapted from ECMWF, shows anomalies and forecasts through August 2026 in the Niño3 region (left panel) and the Niño1+2 region (right panel).

[ image from earlier post ]

The image below, adapted from tropicaltidbits.com, shows a rise since early January 2026 of more than 2.5°C in sea surface temperature anomalies (CDAS data) in the Niño1+2 region through February 28, 2026. 

Nick Breeze talks with Jennifer Francis about the upcoming El Niño in the video below, also discussed on facebook.

Latent heat buffer loss - as sea ice, permafrost and glaciers disappear

Ocean heat is another contributor to Arctic sea ice loss and ocean heat keeps melting sea ice all year long from below. 

Latent heat is energy associated with a phase change, such as the energy consumed when ice turns into water. During a phase change, the temperature remains constant. As long as there is ice, additional heat will be absorbed by the process of ice turning into water, so the temperature doesn't rise at the surface.

[ from Albedo, latent heat, insolation and more ]

The amount of energy absorbed by melting ice is as much as it takes to heat an equivalent mass of water from zero to 80°C.

The image below, from an earlier post, shows monthly Arctic sea ice volume in the past 25 years. Markers show April (blue) and September (red) volume, corresponding with the year's maximum and minimum. In 2025, Arctic sea ice reached a record low maximum volume as well as a record low minimum volume.

As illustrated by the above image, Arctic sea ice volume in April 2025 was very low, so while relatively little melting took place between April 2025 and September 2025, a record low Arctic sea ice volume was still reached in September 2025. The above image shows Arctic sea ice volume through mid December 2025, with an analysis of the strength of the melting between April (annual maximum) and September (annual minimum). If the trend in annual maxima (blue circles) continues, Arctic sea ice in 2026 looks set to reach an even lower volume in April 2026. The difference between strong melting (magenta) and little melting (green) is 3000 km³, so if strong melting will take place from April 2026, this may well cause a Blue Ocean Event to occur later in 2026. A Blue Ocean Event could be said to occur when only 1000 km³ or less Arctic sea ice volume remains.

There is a huge danger that seafloor methane and methane from thawing terrestrial permafrost will add strongly and abruptly to the temperature rise, as discussed in many earlier posts such as this one and as illustrated by the screenshot below.

 

Warmer water flowing into the Arctic Ocean causes Arctic sea ice to lose thickness and thus volume, diminishing its capacity to act as a buffer that consumes ocean heat entering the Arctic Ocean from the North Atlantic. This means that - as sea ice thickness decreases - a lot of incoming ocean heat can no longer be consumed by melting the sea ice from below, and the heat will therefore contribute to higher temperatures of the water of the Arctic Ocean. The danger of this is described in the screenshot below. 

[ screenshot from earlier post ]

The image below shows that Arctic sea ice volume was at a record daily low on February 28, 2026. 

The situation is dire and unacceptably dangerous

The combination image below shows images adapted from Copernicus. The image on the left shows temperature anomalies at the bottom end of the scale over parts of North America and Russia on February 27, 2026, while temperature anomalies are at the top end of the scale over much of the Arctic Ocean. The image on the right shows absolute temperatures on February 27, 2025.

The image below shows a temperature anomaly forecast for February 27, 2026, adapted from tropicaltidbits.com, with anomalies at the top end of the scale (28°C) showing up over most of the Arctic Ocean. The image also illustrates to what extent cold air has descended from the Arctic over Russia and North America, with more background as to why this is happening discussed in a recent post.

The image below shows a temperature anomaly forecast for November 2026, adapted from tropicaltidbits.com, with anomalies at the top end of the scale (13°C) showing up over most of the Arctic Ocean.

The danger is that a strong 2026 El Niño could trigger a cascade of feedbacks, kicking in with increasing ferocity, as follows:

• a strong 2026 El Niño could trigger a cascade of feedbacks, including:
• a Blue Ocean Event (minimal Arctic sea ice), resulting in huge loss of albedo,
• with crossing of the latent heat tipping point (loss of ice buffer), resulting in
• seafloor CH₄ hydrates destabilization and eruption of vast amounts of CH₄, and
• submarine and terrestrial permafrost thawing, resulting in even more emissions,
• and further Jet Stream distortion, causing even more extreme weather events,
• resulting in forest fires, initially in Siberia, Alaska and Canada, and also in
• droughts and fires in global peatlands and in tropical rainforests, causing
• rapid melting and thaw of mountaintop snow and ice, initially causing flooding,
• followed by droughts, fires, water shortages, famine, heatwaves, starvation,
• resulting in massive biodiversity loss, while infrastructure collapses, and
• the Greenland Ice Sheet and parts of the Antarctic Ice Sheet collapse, causing
• massive flooding of coastal areas, next to a huge rise in temperature,
• while more water vapor in the air causes the temperature rise to speed up further.

[ image from earlier post, also discussed on facebook ]

Climate Emergency Declaration

The situation is dire and unacceptably dangerous, and the precautionary principle necessitates rapid, comprehensive and effective action to reduce the damage and to improve the outlook, where needed in combination with a Climate Emergency Declaration, as described in posts such as in this 2022 post and this 2025 post, and as discussed in the Climate Plan group.

Links

• Japanese National Institute of Polar Research
https://ads.nipr.ac.jp/vishop

• NSIDC - Sea Ice Extent

https://nsidc.org/sea-ice-today/sea-ice-tools/charctic-interactive-sea-ice-graph

• Danish Meteorological Institute - Arctic sea ice volume and thickness
https://ocean.dmi.dk/arctic/icethickness/thk.uk.php

• Blue Ocean  Event

https://arctic-news.blogspot.com/p/blue-ocean-event.html

• The threat of seafloor methane eruptions
https://arctic-news.blogspot.com/2025/11/the-threat-of-seafloor-methane-eruptions.html

• Transforming Society
https://arctic-news.blogspot.com/2022/10/transforming-society.html

• Climate Plan
https://arctic-news.blogspot.com/p/climateplan.html

• Climate Emergency Declaration
https://arctic-news.blogspot.com/p/climate-emergency-declaration.html