August 11 Arctic Ice Report

The extent of Arctic ice fell to a new wintertime low in March 2017. But springtime ice persisted and extents since June are hanging around the decadal average.  Below shows the last 27 days through yesterday, August 11, 2017.

 

For this period 2017 was mostly average or higher, continuing into August. This year is now almost 300k km2 greater than 2016 and exceeds 2007 by 600k km2.  SII 2017 is also 600k km2 lower.

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 223 with the same day in 2007.

 

The Table compares 2017 day 223 ice extents with the decadal average and 2007.

Region 2017223 Day 223
Average
2017-Ave. 2007223 2017-2007
 (0) Northern_Hemisphere 6295153 6338630 -43477 5690646 604507
 (1) Beaufort_Sea 646803 740583 -93779 767724 -120921
 (2) Chukchi_Sea 342601 479258 -136657 261771 80831
 (3) East_Siberian_Sea 411714 663564 -251849 207590 204124
 (4) Laptev_Sea 430221 329873 100349 310764 119458
 (5) Kara_Sea 140411 123400 17011 215854 -75443
 (6) Barents_Sea 60001 28883 31118 15996 44005
 (7) Greenland_Sea 236735 253185 -16450 286393 -49658
 (8) Baffin_Bay_Gulf_of_St._Lawrence 207230 71011 136219 83942 123288
 (9) Canadian_Archipelago 527348 439371 87977 361883 165465
 (10) Hudson_Bay 70437 87621 -17184 94262 -23825
 (11) Central_Arctic 3220493 3120642 99851 3083211 137282

Deficits to average are in the BCE region, and surpluses appear almost everywhere else.  Ice is particularly strong in Laptev, Baffin, CAA and the Central Arctic.

The graph below shows Barents this year continues to be above average but fell behind the record year of 2014. After pausing at 70K km2, it dipped to 50k km2, then bounced back to 60k yesterday.

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 will be important to see when the recovery of ice begins.

For more on why Barents Sea matters see Barents Icicles

 

via Science Matters

http://ift.tt/2vZztLV

August 12, 2017 at 04:06PM

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: