A number of people have inquired about the deep red drop today in this graph:
Of course the concern is along the lines of wondering if the world famous Mark Serreze “death spiral” has suddenly kicked in. While people like Joe Romm would be tickled with “I told you so taunts” if in fact the graph represented reality today, it does not. It only represents a satellite data outage. For example see the missing grey sector areas in this NSIDC image derived from the same SSM/I data:
And of course, it doesn’t show up on the newer AQUA based AMSRE sensor, showing now ice extent up for the third day in a row.
Thanks to NSIDC’s Dr. Walt Meier for confirmation.