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We are aware that it may sometimes look odd when the monthly average and the minimum or maximum extent or daily values do not seem to correspond.However, since we are comparing monthly values to monthly values and one-day minimum extents to one-day minimum extents, the important point is to use a consistent method of calculation for each measurement.Also, the minimum or maximum extent value is calculated as an average of the previous five days.Calculating the monthly average from the original data provides a more accurate average.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.Some organizations, including Cryosphere Today, report ice area; NSIDC primarily reports ice extent.
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?We are the number one online marketplace for top-quality Israeli products!