These charts come from the Arctic and Antarctic Research Institute, St. Petersburg, Russia. I downloaded the images from 2008 through 2017 without collusion from their publicly accessible website (here).
The brown blob in the middle is older ice surviving at least one summer’s melt., with the colors for first year and young ice shown in the enlarged legend above.
The 2007 chart is in a different format so appears separately. The 2007 coverage is limited on the North American side, but it does show how much of the Central Arctic multi-year ice was gone in 2007. The subsequent charts show recovery with a decline in 2012 (Great Arctic Cyclone year), followed by increases, especially this year.
As discussed in previous posts, the technology for remotely sensing ice thickness is immature, so multi-year ice serves as a proxy.
via Science Matters
November 3, 2017 at 11:09AM