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Why are the daily minimum values that you are currently quoting for past years slightly different than what you originally stated? The new calculations show, for example, that the record minimum occurred on September 18, 2007, which was two days later than we originally reported (September 16).Why is the monthly average extent not equal to the average of the daily extent values? Why do you use the 1981–2010 average for comparisons? In addition, NSIDC updates extent values, calculated initially with near-real-time data, when final processed data becomes available.

Our originally published value was 4.13 million square kilometers.

That said, analyzing ice area is still quite valuable.

Given the right circumstances, background knowledge, and scientific information on current conditions, it can provide an excellent sense of how much ice there really is “on the ground.” Created: June 2008 Return to top Not all satellites pass close enough to the North Pole for their sensors to collect data there.

Multiply the grid cell area by 100% sea ice and you would get a total extent of 1,250 square km (482 square miles).

Area takes the percentages of sea ice within data cells and adds them up to report how much of the Arctic is covered by ice; area typically uses a threshold of 15%.

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