Back in January I wrote about how the Arctic had gained 2000 cubic kilometres in ice volume. This was calculated by comparing the sea ice thickness of January 2008 to that of January 2011, see the following chart.
Blue color shows thin ice, while green shows thicker ice. Clearly the Arctic’s ice was much thicker in Jan-2011 than it was three years ago in Jan-2008. There is about twice as much solid green in 2011 than in 2008, thus yielding the net gain of about 2000 cubic kilometers.
5000 cubic km more sea ice?
Now that we’ve just past the March-peak in Arctic sea ice area, I thought it’s a good time to take another look at the Arctic sea ice thickness again. What follows is a comparison of March 23, 2008 (the old death spiral days) and March 25, 2011.
Well lo and behold, we see yet another huge increase. That ice thickness increase has grown even more.
Note the huge difference in just three years. Today practically the entire Arctic cap is green…meaning an average thickness of over 3 meters. In 2008 the average thickness down to about 2m. This is all further confirmed by the current Catlin Arctic Survey (h/t: tomnelson.blogspot).
Some of the ice we crossed was really thick multi-year ice that was just too thick to drill through. Our drill goes to four and a half metres and it wasn’t breaking through. In other areas we were able to drop our measuring devices down to a depth of 200 metres below the floating ice.”
I wonder if Mark Serreze is taking note. Hopefully he’ll behave as the scientist he claims to be and make the observation.
I haven’t systematically calculated the March differences above, but you can assume that the core cap itself has an area of 5 million square km. Now multiply that times one meter of added thickness and you get a volume growth of 5000 cubic km!
Okay, that’s just rough guesstimating (perhaps) on the high side, but the ice gain is whopping no matter what. Dr. “Freeze” Serreze can make the calculation himself. Predictions of higher sea ice extents come September are well-founded. The recovery appears to be well on the way. Arctic warming has disappeared.