The PIOMAS graphs at the Polar Science Center of the Applied Physics Laboratory at the University of Washington have been updated. It reached an all-time low of 4.4 thousand km3 last month, but went down some more as we can see on Larry Hamilton's stack graph (Larry also wrote a great blog post discussing these numbers):
So the new record minimum volume is 4.0 thousand cubic kilometers.
Here is the current volume as modeled by the folks from the APL/PSC:
And the volume anomaly:
Let me stress that these volume numbers aren't observed data, but are calculated using the Pan-Arctic Ice Ocean Modeling and Assimilation System (PIOMAS, Zhang and Rothrock, 2003). The real numbers probably aren't off by much, and I base this on some snippets of information like the ice thickness measured at the North Pole by the Polarstern crew and buoy information, but we can't know for sure until the CryoSat-2 team starts churning out some well-calibrated numbers and ice thickness maps.
As always Wipneus was faster than the speed of light (or neutrinos if you prefer) and updated his graphs. Here is his graph showing all the yearly trend lines in the period 2002-2011:
Wipneus has one last graph that shows a little bit more clearly that the current number actually is right on (or just below) the projected exponential downward trend:
Whether the decline will continue in exponential fashion, remains to be seen of course. But it's low. Very, very low.