Now that the PIOMAS main series of total volume is out I can look at what that shows about the May volume loss. This being the first part of the overall spring volume loss.
This May has seen a strong volume loss in line with other post 2010 years.
This is quite steep, but unlike 2012 the trajectory appears to be levelling. Nonetheless 2016 has seen the third greatest May volume loss.
But it is far from as severe as the May volume losses in 2010 or 2012. And this year is markedly different from 2010 and 2012 in terms of where the anomalous volume loss is happening.
In 2010 and 2012 there was substantial volume loss from the peripheral seas (Beaufort through to Laptev), this year most of the loss has come from the Central Arctic. But what thickness bands within the Central Arctic have contributed to this large volume loss?
To look at this I have used PIOMA Gice and have calculated the 2007 to 2015 change from day 121 to day 151, then the 2016 difference from this baseline is shown as a stacked bar graph, revealing the change from average in terms of the average.
So the anomalous loss of volume over May in the Central Arctic mainly comes from thinner ice from the bands 0.71m and 1.46m, and is an exacerbation of the existing tendency to loss in those bands in the Central Arctic over May.