The record had been expected and follows a trend over the last three years of anomalously
high winter ice extents around the southernmost continent — a trend that provides a stark contrast to the inexorable decline of Arctic sea ice, which it's sixth lowest summer extent on record last month.
These record
low winter ice extent conditions were largely a result of a much warmer winter than average, which led to a reduction in the number of freezing degree days (Figure 5).
Mean positions of the major oceanographic fronts and summer and
winter ice extents for the Southern Ocean [7], [14].
The graph combined the low
Arctic winter ice extent with the steep drop of sea ice off Antarctica, just now entering its summer season.
The record follows a trend over the past three years of anomalously
high winter ice extents, providing a stark contrast to the inexorable decline of Arctic sea ice
TimTheToolMan:
Winter ice extent is strongly related to latitude.
«The hemispheric - mean decline in
winter ice extent is due in large part to increasing sea - surface temperatures in the Barents Sea and adjoining waters, which are consistent with increased concentrations of greenhouse gases.»