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Bad Reporting, Southern Hemisphere Ice, & Polar Bears Print E-mail
Written by Craig James, WOOD-TV Blog   
Wednesday, 16 January 2008
NBC did a story the other day on a new study that shows the Antarctic Ice Sheet appears to be melting at a dramatically increased rate over the past 10 years. You can find an article about the study here. The abstract is here. There seems to be some confusion over how this could be since we’ve all heard that the ice in the Southern Hemisphere was at a record high in 2007.

screenshot_03.jpgI think the confusion is because the ice anomaly shown in the chart to the left from The University of Illinois Cryosphere site is for sea ice COVERAGE and not the MASS of the Antarctic Ice Sheet, which, of course, is over land. The sea ice coverage is indeed at a record high since satellite observations were taken in 1979, but I don’t believe this takes into consideration the mass of ice over land. Also, the study’s data only goes to 2006 and does not include 2007. To add to the confusion, the NBC reporter apparently didn’t understand the difference between coverage and mass, and even worse, showed video of polar bears.

There have been other studies that refute the idea of a reduced mass of the Antarctic Ice Sheet. See here and here. Even the IPCC says the trend in the Antarctic is inconclusive and it is a shame, but not unexpected, that NBC would not mention this. I should also note that it would not be correct to say that the Southern Hemisphere Sea Ice coverage being at a record maximum in 2007 refutes the study about a shrinking of the Antarctic Ice Sheet mass up to 2006, since that would be comparing apples to oranges.



 
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