(Image Source: Canadian Weather Office)
A large, rapidly expanding, series of ring-structure cracks in the Arctic sea ice that began in the Beaufort Sea in February has now expanded to encompass much of the remaining thick ice and to cross the North Pole.
In the upper-center portion of the above image, you can see these crack structures pushing through the remaining thick ice and arcing up through the North Pole itself. These North Pole vicinity cracks first appeared a couple of days ago. Since that time, they have rapidly expanded to cover much of the remaining thick ice.
These longitudinal cracks have now also become visible on the US Navy sea ice thickness composite here:
(Image source: US Navy)
Note how, in the last few frames, the thick sea ice begins to crack as it lifts northward off Greenland and the Arctic Archipelago. As the latitudinal cracks break the ice, you can begin to see hair-line longitudinal cracks emerge.
So we have an ever-expanding and ongoing crack-up of a large portion of Arctic sea ice. This increased cracking will, likely, make the ice sheet in cracked regions far less resilient to melt once more direct sunlight begins to rain down starting in May and June.
Other areas worth continued observation include two expanding areas of thin ice north of Alaska and Western Canada.
A good number of amateur and professional eyes are currently keeping tabs on the crack-up, so we will continue to post updates as they become available.