I believe globalwarminghoax.com/ is simply cherry picking data to fit its political agenda. The funny thing is that even the data shown on the Global Warming Hoax website confirms a decrease in Arctic Ice. Their claims about the Arctic ice remaining the same is easily refuted by going to the actual source of their data, The National Snow and Ice Data Center (NSIDC).
Global Warming Hoax claims that the ice is the same in May 1980 as in May 2008.
The first picture below is the actual data and maps from the NSIDC from those two months. The maps on the right hand side show ice concentrations from May 1980 (bottom) and May 2008 (top). The “total area” numbers at the bottom of the right hand side maps both show 10.9 million sq km, which on the surface seems to say that both months have the same area of ice cover. But even with the naked eye, one can see that not only does the May 1980 map show more ice cover, its concentration is also higher.
So why are the numbers the same? Read the fine print. Here’s what NSIDC has to say about how “total area” is calculated:
[quote] Important Note: The “extent” column includes the area near the pole not imaged by the sensor. It is assumed to be entirely ice covered with at least 15% concentration. However, the “area” column excludes the area not imaged by the sensor. This area is 1.19 million square kilometers for SMMR (from the beginning of the series through June 1987) and 0.31 million square kilometers for SSM/I (from July 1987 to present). Therefore, there is a discontinuity in the “area” data values in this file at the June/July
If you look at the maps again, right at the North Pole, there’s a big circle. That area is not included in the “total area” calculation. If you want to get the true “total area” calculation for ice concentration above 15%, take the “total area” number and add 0.31 million sq km for data after June 1987 and 1.19 million sq km before or on June 1987.
Thus, the true reading of the total area (>15% concentration) from May 1980 should read 12.09 million sq km while May 2008 should read 11.21 million sq km, thus showing less ice in May 2008 than May 1980.
The maps of the left hand side show this more clearly, where “ice extent” is shown. Ice extent shows the total area with at least some amount of detectable sea ice. As you can see, May 1980 shows more ice (14.0 million sq km) than May 2008 (13.2 million sq km).
While comparing beginning of Spring ice cover is all fine and well, why doesn’t Global Warming Hoax also show ice cover comparisons from the end of summer? Oh, that’s right, because it doesn’t fit their political agenda.
Below shows a comparison of ice cover at the end of summer: Sept 1980 vs Sept 2007. I think the images are pretty self-explanatory.