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Arctic ice extent changes for the last two weeks are shown in the MASIE animation above. Note that the Pacific basins of Bering and Okhotsk (upper left) melted dramatically.  Meanwhile on the Atlantic side ice persisted, actually growing in Barents and Greenland seas.

The strangeness concerns weirdness in Google Earth Pro treatment of kmz files from MASIE.  Previous I have used these to produce animations like the one below for the month of March.

Today when attempting to do the same for April, this is what was shown.

That is a screen capture since Google Earth could not render an image.  I hope it is just a temporary technical difficulty.  But I can’t help but imagine this depicting some kind of military map with a two-pronged attack by red forces with a single resisting force in red and blue. Is it more virtuous canceling of all things Russian at the expense of scientific inquiry? (The mask with colors was only imposed on the Northern Hemisphere)

The melting effect on NH total ice extents during April is presented in the graph below.

The graph above shows ice extent through April comparing 2022 MASIE reports with the 16-year average, other recent years and with SII.  On average ice extents lost 1.1M km2 during April.  2022 ice extents started slightly lower, then tracked average, ending slightly above average. Both 2021 and 2007 ended  below average, by 200k km2 and 400k km2 respectively. The two green lines at the bottom show average and 2022 extents when Bering and Okhotsk ice are excluded.  On this basis 2022 Arctic was nearly 400k km2 in surplus at end of April.

Region2022120Day 120 Average2022-Ave.20071202022-2007
 (0) Northern_Hemisphere1362387413507670 116204 13108068515806 
 (1) Beaufort_Sea10707761067739 3036 105918911587 
 (2) Chukchi_Sea963424955654 7770 94924614178 
 (3) East_Siberian_Sea10871371085485 1652 10801766961 
 (4) Laptev_Sea897845889961 7884 87566122184 
 (5) Kara_Sea932842911757 21084 86466468178 
 (6) Barents_Sea654813547685 107129 396544258270 
 (7) Greenland_Sea777073640123 136950 644438132635 
 (8) Baffin_Bay_Gulf_of_St._Lawrence12436891205315 38374 114711596574 
 (9) Canadian_Archipelago854685848564 6121 83803216653 
 (10) Hudson_Bay12402621238267 1995 122207418188 
 (11) Central_Arctic32473073229654 17652 32410346272 
 (12) Bering_Sea334929482018-147089 475489-140560 
 (13) Baltic_Sea2269620622 2074 146848012 
 (14) Sea_of_Okhotsk294259381697 -87438 295743-1484 

The only deficits to average are in Bering and Okhotsk, more than offset by surpluses everywhere else, especially in Barents and Greenland seas. 2007 extents were lower by 516k km2 (half a Wadham)

April 1st Footnote:

It has been a long hard winter, requiring overtime efforts by Norwegian icebreakers like this one:

In addition, cold Spring temperatures led to unusual sightings of Northern creatures:

Not only Polar bears are flourishing!

via Science Matters

May 1, 2022

May 1 Arctic Ice Persists Strangely | Science Matters (rclutz.com)