The image below, from an animation by Zachary Labe, shows Arctic sea ice extent up to June 20, 2022, based on Vishop data. The yellow line is the year 2022. The white line shows extent for the year 2012, when it reached a record minimum in September. The blue line shows extent the year 2020, when the minimum in September was second lowest.
The image below, adapted from Vishop, shows that on June 23, 2022, global sea ice extent was at a record low for the time of year.
|[ adapted from NOAA – click on images to enlarge ]|
The NOAA image below indicates that going from the bottom of a La Niña to the peak of an El Niño could make a difference of more than half a degree Celsius (0.5°C or 0.9°F).
Furthermore, the rise in sunspots from May 2020 to July 2025 could make a difference of some 0.15°C (0.27°F). The next El Niño looks set to line up with a high peak in sunspots, in a cataclysmic alignment that could push up the temperature enough to cause dramatic sea ice loss in the Arctic, resulting in runaway temperature rise by 2026.
Multi-year Sea Ice
The NSIDC compilation below illustrates how much multi-year sea ice has already declined over the years. The top panel shows the age of Arctic sea ice for the March 12 to 18 period in (a) 1985 and (b) 2022. The oldest ice, greater than 4 years old, is in red. Plot (c) shows the timeseries from 1985 through 2022 of percent cover of the Arctic Ocean domain (inset, purple region) by different sea ice ages during the March 12 to 18 period.
On June 18, 2022, Arctic sea ice volume was among the lowest on record for the time of year, as illustrated by the image below, adapted from Polarportal.
A Blue Ocean Event occurs when virtually all sea ice disappears and the surface color changes from white (sea ice) to blue (ocean). According to many, a Blue Ocean Event starts once Arctic sea ice extent falls below 1 million km².
The image on the right shows a trend pointing at zero Arctic sea ice volume by September 2027.
Note that the volume data in the image are averages for the month September — the minimum for each year is even lower. Furthermore, since zero volume implies zero extent, this indicates that a Blue Ocean Event (extent below 1 million km²) could happen well before 2027.
The Naval Research Laboratory one-month animation below shows Arctic sea ice thickness up to June 18, 2022, with 8 days of forecasts added.
The NASA Worldview image below shows the situation on June 24, 2022. Plenty of water is showing up as close as 200 km to the North Pole.
Ocean heat keeps rising; in 2021, despite La Niña conditions, ocean heat reached yet another record high, as illustrated by the above image, from an earlier post.
A 2019 analysis concludes that the latent heat tipping point gets crossed when the sea surface temperature anomaly on the Northern Hemisphere gets higher than 1°C above 20th century’s temperature and when there is little or no thick sea ice left. As the image below indicates, the temperature anomaly of 1°C above the 20th century average looks set to be crossed in the course of the year 2021.
|[ from the post Arctic Ocean invaded by hot, salty water ]|
The combination image below illustrates how much ocean heat is entering the Arctic Ocean from the Atlantic Ocean, heating up the sea ice from below.
The left panel shows the depth of the Arctic Ocean, with darker blue indicating greater depth.
In the right panel, the light blue, green and yellow colors indicate the thickest ice, located in the shallow waters off the coasts of North America and Greenland. The darker blue colors indicate where much of the sea ice has melted away, from below, as also illustrated by the one-month animation below showing sea ice thickness up to June 22, 2022, with an added 8 days of forecasts. The white color indicates where the sea ice has melted away entirely, e.g. in the Bering Strait and north of Siberia, mainly due to warm water from rivers entering the Arctic Ocean.
Once most of the sea ice that was hanging underneath the surface is gone, further heat will still keep moving underneath the sea ice from the Atlantic Ocean and – to a lesser extent – from the Atlantic Ocean into the Arctic Ocean. Without the latent heat buffer, this heat must go elsewhere, i.e. it will typically raise the temperature of the water. The atmosphere will also warm up faster. More evaporation will occur once the sea ice is gone, further warming up the atmosphere.
One huge danger is that, as the buffer disappears that until now has consumed huge amounts of ocean heat, more heat will reach methane hydrates at the seafloor of the Arctic Ocean, causing them to get destabilized and resulting in releases of methane from these hydrates and from free gas underneath that was previously sealed by the hydrates.
As the latent heat buffer of the sea ice underneath the surface disappears, more of this heat could then reach sediments at the seafloor of the Arctic Ocean, threatening eruptions to occur of seafloor methane (from hydrates and from free gas underneath the hydrates). The methane could similarly push up temperatures dramatically over the Arctic, and globally over the next few years.
The above 2014 image, from the feedbacks page, shows three of the numerous feedbacks that are accelerating warming in the Arctic. Feedback #1 is the albedo feedback. Feedback #14 refers to the loss of the Latent Heat Buffer and warming of the Arctic Ocean. Feedback #2 refers to methane releases.
Heatwaves look set to continue on the Northern Hemisphere, extending heat over the Arctic Ocean and thus affecting Arctic sea ice from above, while warm water from rivers will cause more melting at the surface, and while rising ocean heat will continue to cause more melting of the ice underneath the surface. If this continues, we can expect a new record low for sea ice in September 2022 and the joint loss of the latent heat buffer and the loss of albedo could push up temperatures dramatically over the Arctic, while the additional methane could similarly push up temperatures dramatically over the Arctic, and globally over the next few years.
|[ The Buffer has gone, feedback #14 on the Feedbacks page ]|
• NSIDC – Charctic
• Zachary Labe – sea ice extent and concentration
• Vishop sea ice data
• NSIDC – Springtime in the Arctic
• NOAA – ENSO: Recent Evolution, Current Status and Predictions
• Cataclysmic Alignment
• Albedo, latent heat, insolation and more
• Climate Plan