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Extra Discussion about Arctic 9/15/2009

Sources:

Figure S2. Daily ice extents 2005, 2007, and 2008, and averaged over the 5-yr periods 1980–84 through 2000–04. Values are derived from satellite passive microwave data from NASA’s SMMR and the Department of Defense’s SSM/I. (Adapted from Comiso et al )

Figure S3. Time series of the difference in ice extent in Mar (the month of ice extent maximum) and Sep (the month of ice extent minimum) from the mean values for the time period 1979–2007. Based on a least squares linear regression, the rate of decrease for the Mar and Sep ice extents was –2.8% and –11.1% per decade, respectively.