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Tom Francis - SWSports wrote in
: On Mon, 05 Jan 2009 17:23:51 -0600, Jim Willemin wrote: "CRM" wrote in : I remember the hysteria during the summer on how there would be no sea ice this year due to global warming. I'm pretty sure it was Chuck G pushing this BS here. Chuck, can you relax now that the sea ice is now back to it's historical levels? http://www.dailytech.com/Article.aspx?newsid=13834 I suppose I'll regret this, but I'm afraid the data available at http://arctic.atmos.uiuc.edu/cryosph...ly.ice.area.wi thtr end.jpg or http://tinyurl.com/2nv9n6 strongly suggests that indeed, global sea ice area over the last couple of years is significantly below the 20 year average for 1979-2000, and further, the recent trend is for continuing reduction in sea ice area. In fact, that very figure is presented in the article you reference - you might want to take a closer look at it before you reject the idea that something is happening with respect to global sea ice area. I daresay if that graph were of your bank account, rather than sea ice, you'd be a lot more concerned. You do realise that the graph you reference was "adjusted" after it was first published. Seems like the data showed an increase in sea ice, verified by observational data, then somehow "adjusted" to show a decrease in sea ice based on statistical average. 35,000 square miles to be exact. :) This is "hockey stick" graphing taken to extremes to prove a point. -- "Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats." H. L. Mencken Um, 35,000 square miles is about 95,600 square kilometers. The units in that graph are in millions of square kilometers - the annual variation during 2008 looks like it was on the order of 6 million square kilometers. Thus, the difference of 35,000 square miles is less than two percent of the annual variation last year. Indeed, it looks like the average annual area of sea ice since 2005 is between one and one and a half million square kilometers below the 1979-2000 average, which means a difference of 35,000 square miles one way or the other really doesn't make a whole lot of difference in the conclusion that the average area of sea ice in 2008 was significantly lower than the 1979- 2000 baseline, and further that the trend over the last decade suggests a steady loss of sea ice. In order to disregard the graph as politically driven, you need to find half a million square miles of ice that was 'adjusted' away each year for the last five years at least. |
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