Sea Ice Annual vs Polar
Posted by Jeff Id on March 1, 2012
No time to write much but these plots are of the Northern Hemisphere sea ice above and below 72 latitude. The split between the area is 50/50. My anomaly timeframe is from about 1988 to present, I think I will address that in future posts.
Reader Chuckles linked to a register article which linked to a nasa website on a new multi-year sea ice paper by Comiso, a coauthor of Steig 09. It is worth checking out. I think we should take some time to look at the differences in the future. There are some interesting graphics at the site though which are worth checking out. He is reporting a perrenial ice area loss in the 15%/decade range. I don’t have the north of 72 total ice area handy but it is approximately 6 million km^2 so we are looking at a total loss of about 274,000/6,000,000 = 4.6% trend loss for north of 72 degrees. A far lower number than he is reporting. His numbers may be quite accurate but that would mean that there is a balancing gain in annual ice area for that same timeperiod.
If someone has access to the paper, please send it to me. We already reported that global annual sea ice trends didn’t reach 95% significance. His result would likely mean demonstration of no trend in global annual ice, offset by a decrease in perennial ice.
When someone sorts just the multi-year stuff, shouldn’t we be able to sort the annual and report its trends?