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Color-coded maps of monthly average surface temperatures in (a) September 2014 and (b) September 2015. Scatter plots of WMO/in situ data versus corresponding AVHRR surface temperatures data in (c) September 2014 and (d) September 2015. Scatter plots of Operation Ice Bridge infrared data versus AVHRR surface temperatures in (e) November 2012 and (f) November 2013.
