October Arctic Ice is Back

Iowa Climate Science Education

Given the fluctuations in daily sea ice measurements, climatology typically relies on monthly averages. October daily extents are now fully reported and the 2017 October monthly results can be compared with years of the previous decade.  MASIE showed 2017 reached 6.8M km2, exceeding the 6.6M October 10 year average.  SII was close behind at 6.7M for the month.  The 11 year linear trend is more upward for MASIE, mainly due to early years, especially 2007 and 2008 reported higher in SII.  In either case, one can easily see the Arctic ice extents have not declined; MASIE shows 2017  higher than 2016 by 800k km2, and more than 2007 by 1M km2.

Sea Ice Index statistics are from newly released SIIv.3.0,  as reported in Sea Ice Index Updates to v.3.0.

The graph below shows October comparisons through day 304 (Oct. 31).

Note that 2017 in both MASIE and SII tracked the 10…

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