July 10 Arctic Ice Report

The extent of Arctic ice fell to a new wintertime low in March 2017. But springtime ice persisted and June and July are hanging around the decadal average.

The graph shows the last two weeks ending day 190, July 9, 2017.  2016 and 2017 are nearly average and lower than 9M km2, while 2007 is about 150k km2 down, and SII 2017 even lower. The recent drop was largely due to Hudson Bay going to open water in just ten days (images at Ten Days in Hudson Bay).

As we shall see, this year’s extents are in surplus on the Atlantic side, offset by deficits on the Pacific side and in Hudson Bay.  The image compares day 190 with one year ago.

The Table compares 2017 day 190 ice extents with the decadal average and 2007

Region 2017190 Day 190
Average
2017-Ave. 2007190 2017-2007
 (0) Northern_Hemisphere 8877716 8991896 -114181 8732146 145570
 (1) Beaufort_Sea 825960 866156 -40196 860404 -34443
 (2) Chukchi_Sea 563718 683345 -119626 609005 -45287
 (3) East_Siberian_Sea 868691 1000309 -131618 871751 -3060
 (4) Laptev_Sea 719324 674515 44809 647038 72285
 (5) Kara_Sea 538340 437243 101097 499369 38971
 (6) Barents_Sea 125872 69548 56324 77180 48692
 (7) Greenland_Sea 563021 450768 112253 475611 87410
 (8) Baffin_Bay_Gulf_of_St._Lawrence 419134 364194 54941 379529 39606
 (9) Canadian_Archipelago 702592 750592 -48000 743621 -41030
 (10) Hudson_Bay 306542 499414 -192873 360041 -53499
 (11) Central_Arctic 3243319 3183825 59494 3205488 37831

The deficits in BCE (Beaufort, Chukchi, East Siberian) are offset by surpluses elsewhere.  2017 would be above average were it not for the 193k km2 deficit in Hudson Bay.

The graph below shows Barents this year continues to be above average matching the record year of 2014.  It will be interesting to see if 2017 hits its minimum around day 210 like 2014 did.

 

The black line is average for the last 11 years.  2007 in purple appears close to an average year.  2014 had the highest annual extent in Barents Sea, due to higher and later maximums, holding onto ice during the summer, and recovering quickly.  In contrast, 2016 was the lowest annual extent, melting out early and recovering later.  2017 in blue started out way behind, but grew rapidly to reach average, and then persisted longer to exceed even 2014.  It may yet beat out 2014 as the highest in the last 11 years.

For more on why Barents Sea matters see Barents Icicles

 

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One comment

  1. angech · July 12

    That’s better. What a difference a couple of days make.

    Like

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