As of December 31st total sea ice volume, as modeled by PIOMAS, is still lower than it was in pre-2010 years around this time. Because of rapid growth during December 2007, this year is no longer closest to the current value (739 km3 more). Now it's 2009 with 299 km3 more than now.
As for the post-2012 rebound years, 2015 is currently 128 km3 lower than 2013, but the difference with 2014 has gone down from 1308 to 1193 km3 less volume. The difference with 2012 has also gone down, but there is still a massive 1731 km3 more ice now than there was at the end of December 2012, almost the same number at the start of the year (1756 km3).
Here are the differences with all other years in the 2006-2015 period at the start and the end of the year in km3:
|Jan 1st||Dec 31st|
Really big changes occurred in relation to 2011, but especially in relation to rebound years 2013 and 2014, where the difference decreased 3036 and 2212 km3 respectively during the course of a year.
As always I'm posting Wipneus' version of the volume graph which contains more years:
2015 clearly ends the year in 4th position.
The trend line on the PIOMAS sea ice volume anomaly graph has crept up some more, and is now moving towards 2 STD territory above the linear trend:
It will be interesting to see how much higher it will get.
The 2015 trend line on the PICT graph (my crude average sea ice thickness calculation, derived by dividing PIOMAS volume numbers with Cryosphere Today sea ice area numbers) has followed the same trajectory as the years below it, so no surprises there:
And the same goes for the Polar Science Center's thickness graph:
2015 has now officially ended.