This time the Sea Ice Volume Series offers an interactive feature to explore sea ice reduction in 2012. Just hover your mouse over the months below to load the indicated map.
PIOMAS shows significant reduction in thickest ice category North of Greenland and the Archipelago in December. An overall thinning compared to December 2011 is also observable, but less surprising, because that's the trend.-> continue reading
Jennifer Francis makes a great job drawing a line from sea ice retreat to slower moving weather patterns on the northern hemisphere. Probably it is strongly against common sense to accept colder winter and more snow as an aspect of global warming, but eventually even a room full of meteorologists absorbs the message - if properly presented.-> continue reading
A new installment of the sea ice volume/thickness series, this time it's from latest the 2007 IPCC AR4 Report, Working Group I: The Physical Science Basis, chapter 18.104.22.168 Evidence of Changes in Arctic Pack Ice Thickness from Submarine Sonar:
Estimates of thickness change over limited regions are possible when submarine transects are repeated (e.g., Wadhams, 1992). The North Pole is a common waypoint in many submarine cruises and this allowed McLaren et al. (1994) to analyse data from 12 submarine cruises near the pole between 1958 and 1992. They found considerable interannual variability, but no significant trend. Shy and Walsh (1996) examined the same data in relation to ice drift and found that much of the thickness variability was due to the source location and path followed by the ice prior to arrival at the pole.-> continue reading