NSIDC SIE
X 106 km2
2017, 07, 09, 8.657
2017, 07, 10, 8.591
2017, 07, 11, 8.434
2017, 07, 12, 8.274
That's a 157k drop on the 11th and 160k drop on the 12th.
Viewing NSIDC daily numbers versus the 5 day averages could lead the casual viewer to come to contradictory conclusions. The 2017 5 day average for today (as shown in the charts on the NSIDC website) only shows a drop a 89,000 square km2. Thus, the chart below appears to show SIE extent in 2017 is falling off the pace set in 2012. However, if only viewing the daily numbers, one could conclude based on the last two days that melting momentum is building in 2017 and was falling in 2012.
2017, 07, 08, 8.681, -41 2012, 07, 08, 8.398, -123
2017, 07, 09, 8.657, -24 2012, 07, 09, 8.174, -224
2017, 07, 10, 8.591, -66 2012, 07, 10, 8.13, -44
2017, 07, 11, 8.434, -157 2012, 07, 11, 8.032, -98
2017, 07, 12, 8.274, -160 2012, 07, 11, 7.946, -86
The trend lines from 2012 and 2017 are likely to converge during the next two days as the 2012 drops of -123 and -224 will be replaced by drops of -29 and -49 in the average, particularly if the declines posted over the next two days are greater than -41 and -24 from 7/8 and 7/9.