Arctic Sea Ice Extent, Area, and Volume

[WolfStock1]

10 minutes ago, TheClimateChanger said:

Current State of Sea Ice Cover | Earth

 

OK thanks.

I see the description of the two: "Sea ice extent is the integral sum of the areas of all grid cells with at least 15% ice concentration, while sea ice area is the integral sum of the product of ice concentration and area of all grid cells with at least 15% ice concentration."

I *think* I get the distinction but not sure.   Is it the case that "extent" include 100% of every grid cell, for cells with > 15% concentration; whereas "area" includes only the area of ice itself within all those cells?

(thus why extent is larger than area)

(I had been using the NSIDC page which only shows extent - https://nsidc.org/sea-ice-today/sea-ice-tools/charctic-interactive-sea-ice-graph)

 

[bluewave]

Even though the areas north of 60N had their warmest June on record, a small area of the Arctic to the north of Alaska had their coldest June on record.

This Beaufort Sea region is a key area in determining what the annual sea ice minimum in September will be. Early season weak dipole patterns which are colder in this region have been common since 2013. It indicates locally fewer melt ponds and a better pattern for sea ice retention toward the Pacific side of the Arctic. 

Seasons like 2012 and 2020 had very strong dipole patterns which preconditioned the ice for a big melt out by August and September. Most seasons since 2013 have finished in the 4.0 to 4.9 million sq km range for extent.

Only 2012 and 2020 finished below 4.0 million sq km due to extreme dipole patterns and early record melt ponding.  
 

 

Climatologist49

 

‪@climatologist49.bsky.social‬

 

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For the combined area poleward of 60N, this was the warmest June on record - despite the fact that a portion of the area north of Alaska had its coldest June on record (since 1940). @alaskawx.bsky.social

 

10:51 PM · Jul 6, 2026

 

Arctic Temperatures

https://alaskaclimate.substack.com/p/june-2026-arctic-and-alaska-climate

June was very mild over a large part of the Arctic. About 70 percent of the Arctic (land and seas poleward of 60°N) had a warmer than average June relative to the 1991-2020 baseline (Fig. 1). But almost 85 percent of Arctic land areas were milder than normal. About 12 percent of the Arctic had the warmest June since 1950 in ERA5 reanalysis, while only 1 percent had the coldest June in the past 77 years. 

The warmth was most dramatic in western Siberia. For Yamalo-Nenets Autonomous Okrug this was by far the warmest June on record. For the third time in the past five years, Svalbard had the warmest June on record. Parts of the Northwest Territories and southern Nunavut, Canada also had the warmest June on record. Areas with below normal temperatures were more restricted. June was quite chilly north of about 75N over the Canadian Arctic Islands and westward into the Arctic basin east of the dateline as well as on Alaska’s North Slope.

Of special note was the extreme warmth in northwest Siberia on June 25. Beliy Island (73.3°N), just offshore of the Yamal Peninsula, reached 28.3C (83F). According to M. Herrera on his “Extreme Temperatures Around the World” Bluesky account, this is (apparently) the highest temperature on record so far north anywhere in the world. This heat was concurrent with the late June western and central European heatwave but was entirely distinct, as Russia east of Ural Mountains was generally cooler than normal during this time.

Since 1950, this was easily the warmest June on record for the Arctic overall (Fig. 2) and the mildest since 2020. Arctic lands also had the highest June average temperature. 
 

 

 

[GaWx]

31 minutes ago, bluewave said:

Even though the areas north of 60N had their warmest June on record, a small area of the Arctic to the north of Alaska had their coldest June on record.

This Beaufort Sea region is a key area in determining what the annual sea ice minimum in September will be. Early season weak dipole patterns which are colder in this region have been common since 2013. It indicates locally fewer melt ponds and a better pattern for sea ice retention toward the Pacific side of the Arctic. 

Seasons like 2012 and 2020 had very strong dipole patterns which preconditioned the ice for a big melt out by August and September. Most seasons since 2013 have finished in the 4.0 to 4.9 million sq km range for extent.

Only 2012 and 2020 finished below 4.0 million sq km due to extreme dipole patterns and early record melt ponding.  
 

 

Climatologist49

 

‪@climatologist49.bsky.social‬

 

Follow

For the combined area poleward of 60N, this was the warmest June on record - despite the fact that a portion of the area north of Alaska had its coldest June on record (since 1940). @alaskawx.bsky.social

 

10:51 PM · Jul 6, 2026

 

Arctic Temperatures

https://alaskaclimate.substack.com/p/june-2026-arctic-and-alaska-climate

June was very mild over a large part of the Arctic. About 70 percent of the Arctic (land and seas poleward of 60°N) had a warmer than average June relative to the 1991-2020 baseline (Fig. 1). But almost 85 percent of Arctic land areas were milder than normal. About 12 percent of the Arctic had the warmest June since 1950 in ERA5 reanalysis, while only 1 percent had the coldest June in the past 77 years. 

The warmth was most dramatic in western Siberia. For Yamalo-Nenets Autonomous Okrug this was by far the warmest June on record. For the third time in the past five years, Svalbard had the warmest June on record. Parts of the Northwest Territories and southern Nunavut, Canada also had the warmest June on record. Areas with below normal temperatures were more restricted. June was quite chilly north of about 75N over the Canadian Arctic Islands and westward into the Arctic basin east of the dateline as well as on Alaska’s North Slope.

Of special note was the extreme warmth in northwest Siberia on June 25. Beliy Island (73.3°N), just offshore of the Yamal Peninsula, reached 28.3C (83F). According to M. Herrera on his “Extreme Temperatures Around the World” Bluesky account, this is (apparently) the highest temperature on record so far north anywhere in the world. This heat was concurrent with the late June western and central European heatwave but was entirely distinct, as Russia east of Ural Mountains was generally cooler than normal during this time.

Since 1950, this was easily the warmest June on record for the Arctic overall (Fig. 2) and the mildest since 2020. Arctic lands also had the highest June average temperature. 
 

 

 

Meanwhile, per DMI charts back to 1958, the mean temp. for the Arctic N of 80N continues being the coldest on record (I’ve been looking at all years’ charts) thus continuing the coldest overall there since the 2nd half of May: