JAXA ARCTIC EXTENT 6,731,603 km2(October 24, 2018)Sorry about yesterday's lack of posting. **it happens from time to time.
- Extent increase at 156 k is about 55 k ABOVE the average (2008-2017) on this day,
- Extent is 705 k (9.5 %) below the 2010's average extent on this date,
- Extent is 576 k (7.9 %) below 2017 on this date,
- Extent is lowest in the satellite record by a smidgeon,
- Freezing to date from minimum is 867 k (27.6%) less than the 10 year average extent gain,
- on average 31.5 % (< 1/3rd) of the increase in extent is done.
An extra line in the table based on average extent increase in the last 5 years has been added. This is because extent gain in 2012-13 was so large (rebound from record low minimum) that it distorts the average. The outcome from using the 10 year average extent gain from now is a maximum of 13.47 million km2 (410k < 2017).
Using the previous 5 years's average extent gain, the resulting maximum is 13.19 million km2, some 690,000 km2 less than the 2017 record low maximum of 13.88 million km2,
which is going back towards the believable. Extent gain is currently playing catch-up (in the last 3 days). GFS indicates that overall the Arctic is at a lower temperature anomaly of around +3 celsius above average temperatures gradually rising to +5 by Wed Oct 31. Every day, the GFS forecast is at slightly lower temperature anomaly - which seems to be a pattern with GFS. If Hansen's prediction of a temperature spike over the next few months then yes, all bets are off. But caution is the watchword.
Where GFs has been pretty spot on is the concentration of the high +ve anomalies in an arc from the East of the CAA in an arc around the Arctic Ocean to West of Novaya Zemla and then south towards Svlabard. Timing of refreeze in these area will be interesting.
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ps: The 2010's average figure used in Juan's table includes 2018 while the figure I use in the attached table excludes 2018. I exclude 2018 (from all JAXA and NSIDC tables and graphs) so the difference of the current year with the 2010's decade to date average is not modified by the current year data.
Quote from Juan - including 2018 in the 2010's average also confuses things somewhat.
(I decided to suspend the 2010's avg line, because it was too variable).
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