2022 Arctic Ice Usual June Swoon

The image above shows melting of Arctic sea ice extent over the last half of June 2022.  As usual the process of declining ice extent follows a LIFO pattern:  Last In First Out.  That is, the marginal seas are the last to freeze and the first to melt.  Thus on the extreme left of the image, the Pacific basins of Bering and Okhotsk seas are entirely open water.  Meanwhile on the lower right, Hudson Bay ice retreats 400k km2 from north to south.  Note center right Gulf of St. Lawrence turns blue.  At the top center Barents Sea ice retreated down to 40k km2 or 5% of its last maximum. Kara Sea upper left lost 340k km2 down to 45% of its last max.  Center left Laptev has melted somewhat, but still retains 76% of its maximum ice extent. The central mass of Arctic ice is intact with some fluctuations back and forth, and as well as Beaufort Sea and CAA (Canadian Arctic Archipelago) were slow to melt in June, retaining 97% of maximum ice in each basin.

The graph below shows the ice extent retreating during June compared to some other years and the 16 year average (2006 to 2021 inclusive).

The chart black line shows that on average in June Arctic ice extent goes down 1.8M km2.  2020, as well as 2007 started June above average, but ended the month matching average. SII was higher than MASIE some days, but ended up the same.  Since Hudson Bay melts the most at this time, the dark green line shows the Arctic total excluding Hudson Bay (HB).  The light green is 2022 minus HB, showing that most of the surplus to average ice was in Hudson Bay starting June, and then retreated to average in the second half of June.  Again note that Hudson Bay is outside the Arctic circle and will be open water soon.

The table shows where the ice is distributed compared to average.  Bering and Okhotsk are open water at this point and are dropped from this and future monthly updates. 

Region 2022181 Day 181 Average 2022-Ave. 2020181 2022-2020
 (0) Northern_Hemisphere 9732940 9751345  -18405  9164791 568149 
 (1) Beaufort_Sea 1033264 921004  112260  983906 49358 
 (2) Chukchi_Sea 717500 723606  -6105  734107 -16607 
 (3) East_Siberian_Sea 1060947 1006910  54037  879242 181705 
 (4) Laptev_Sea 690688 700482  -9794  522834 167855 
 (5) Kara_Sea 416591 550493  -133903  292013 124578 
 (6) Barents_Sea 48841 121301  -72460  145978 -97137 
 (7) Greenland_Sea 480208 501184  -20976  422780 57427 
 (8) Baffin_Bay_Gulf_of_St._Lawrence 647844 505146  142698  479013 168831 
 (9) Canadian_Archipelago 828864 777527  51337  772844 56020 
 (10) Hudson_Bay 618405 712913  -94508  687820 -69416 
 (11) Central_Arctic 3181467 3205732  -24265  3235700 -54234 

The main deficits to average are in  Kara, Barents and Hudson Bay,  offset by surpluses in  Beaufort, East Siberian, Baffin Bay and CAA.

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. It is a visual representation of scientific datasets measuring Arctic ice extents.

via Science Matters

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July 1, 2022 at 01:18PM

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