In the first half of June 2019, the shift from ice to water is unusually lop-sided in two respects. The image above, supported by the table later on shows that in the last two weeks water has opened up faster on the Pacific side, and much slower on the Atlantic side, with the exception of Baffin Bay. The other surprise is that MASIE shows much less ice than does SII, a reversal of the typical situation.
Note that the NH ice extent 12 year average declined from 12.7M km2 to 10.9M km2 during in the last 30 days. MASIE 2019 shows about the same decline from 11.9M km2 to 10.3M km2. That track matched 2016 in May, but is now closest to 2010 and below other years. Interestingly SII showed a much slower rate of ice extent loss, starting nearly the same as MASIE, but ended this period 400k km2 higher. and close to average and 2018.
I have no explanation for the differential between MASIE and SII. Note that ice extents in both datasets are levelling off mid-June.
|Region||2019166||Day 166 Average||2019-Ave.||2010166||2019-2010|
| (8) Baffin_Bay_
The table shows where the ice is distributed to make the 5.4% defict to average. Beaufort and Chukchi Seas are more than half of the NH deficit to average, while Baffin has lost 175k km2 to average.
Illustration by Eleanor Lutz shows Earth’s seasonal climate changes. If played in full screen, the four corners present views from top, bottom and sides.