Sea ice continues to get lots of attention. I previously discussed March 2008 results here. June 2008 results should be available soon, but in the mean time, I’ve updated my own graphics showing a tripartite image of global, SH and NH, instead of only showing NH sea ice, as done in other recent comments e.g. Phil here, the UK Independent and Michael Tobis here.
First, I’ve uploaded a script that collates the SIDADS information into coherent time series (see www.climateaudit.org/scripts/seaice) and can be a tool for people wishing to carry out their own analyses.
Here is a tripartite plot of global, SH and NH sea ice, expressed here as monthly anomalies (in million sq km). On a global basis, sea ice anomalies in May 2008 continue to be above the long-term average during the 1979-2008 satellite period - the 10th highest on record. SH sea ice is off a bit (in anomaly terms) from record levels earlier in 2008, but remains at near record levels (3rd highest May anomaly). In fairness to last year’s commenters on Arctic sea ice, 2007 sea ice levels really do stick out relative to other values during the satellite period; May 2008 NH sea ice are not as extreme as last year’s (10th lowest.)
http://www.climateaudit.org/?p=3219#more-3219









"Volume" or "mass" measures even worse...
Because we have been losing "depth" of Arctic sea ice roughly as fast as area, it means that the total volume (or mass) loss is dire. E.g. if we lose 50% of the area AND 50% of the thickness, it means we lose closer to 75% of the mass (or volume). This represents a loss of an enormous heat sink. So it's not just the albedo issue, whereby open oceans will absorb more solar heat. It's also that the surrounding waters have less ability to dump their heat any more.
And of course this same loss of heat sink/increased albedo will inevitably feedback into accelerated deterioration of nearby permafrost regions... The general drumbeat of "worse than expected" data points that we keep getting is ominous. Google "climate change" & "worse than expected"... Not good...