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You can find more information on sea ice research on the State of the Cryosphere: Sea Ice and All About Sea Ice Web page. If warm Arctic conditions suggest continued global warming, then why doesn’t colder-than-usual weather in my region suggest global cooling? If we put white “styrofoam” in the ocean to replace sea ice, would it stop climate change?
For basic background information, see Quick Facts on Arctic Sea Ice. What is the standard deviation range on the daily image? Why don’t you publish a global sea ice extent number? In April 2012, NSIDC updated its method of calculating daily values for the Arctic sea ice extent minimum from a 5-day centered average to a 5-day trailing average.
This lets us compare “apples to apples” and see change on a year over year time scale.
Created October 7, 2013 Area and extent are different measures and give scientists slightly different information.
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Instructions and suggestions for how to make the most of these ice breaker activities are included with each ice breaker.
A more precise explanation of extent versus area gets more complicated.
Extent defines a region as “ice-covered” or “not ice-covered.” For each satellite data cell, the cell is said to either have ice or to have no ice, based on a threshold.
Even in your regularly scheduled, weekly meetings, a brief ice breaker makes a difference in the resulting employee conversations.
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.
In the final data, the date of the minimum may also change for some years.
For more information on calculating daily sea ice extent values, see the Sea Ice Index documentation.