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This lets us compare “apples to apples” and see change on a year over year time scale.

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.

You would have a total area of 662 square km (255.8 square miles).

Scientists at NSIDC report extent because they are cautious about summertime values of ice concentration and area taken from satellite sensors.

Once Arctic sea ice is broken up, does it melt faster?

How do we know human activities cause climate change? Have undersea volcanoes caused the Arctic sea ice decline? Do hurricanes in the Atlantic break up Arctic sea ice?

The most common threshold (and the one NSIDC uses) is 15 percent, meaning that if the data cell has greater than 15 percent ice concentration, the cell is considered ice covered; less than that and it is said to be ice free.

Example: Let’s say you have three 25 kilometer (km) x 25 km (16 miles x 16 miles) grid cells covered by 16% ice, 2% ice, and 90% ice.

Also, the minimum or maximum extent value is calculated as an average of the previous five days.

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