The 2026 El Niño
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| [ 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).
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| [ image from earlier post ] |
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| [ 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.
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| [ 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).
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| [ 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 March 1, 2026.
Ocean temperatures
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.
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| [ image from earlier post, discussed on facebook and also at the Arcticnews group on facebook ] |
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.
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| [ image from earlier post, click on images to enlarge ] |
Arctic sea ice
Arctic sea ice extent was 13.49 million km² on March 1, 2026, the second lowest extent on record for the time of year.
This is a very dangerous situation, since we're moving out of a La Niña that is suppressing the temperature into an El Niño that is elevating the temperature and as described in a recent post.
The image below shows that the Arctic sea ice extent was 1.38 million km² lower than 1981-2010 on March 1, 2026 (black), the second lowest daily anomaly on record and a deviation from 1981-2010 of -3.12σ. The sea ice extent anomaly was lower on March 1, 2025 (purple), when the standard deviation was -3.71σ, but it was -1.26σ on May 1, 2025.
The danger is further illustrated by the image below that 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, 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 be said to occur when only 1000 km³ or less Arctic sea ice volume remains. The image below shows that Arctic sea ice volume was at a record daily low on March 2, 2026.
Climate Emergency Declaration
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
• 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 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
• 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















































