Persisting Arctic Ice April 30

 


In April, Arctic ice extent showed typical losses, with two exceptions.  Bering Sea has melted out ahead of schedule, while Barents Sea Ice is remarkably high this Spring. The image above shows Barents ice extents on day 120 from 2012 to 2018 (yesterday).  Note how both shelf ice and central ice are greater this year and last.  The graph below shows 2018 exceeds even 2014, the previous decadal high, stubbornly holding onto 700k km2.

The graph below shows how the Arctic extent has faired in April compared to the 11 year average and to some years of interest.
Note that 2018 is close to 2017 and slightly below the 11-year average.  SII 2018 tracks about 200k km2 lower, while 2007 is another 200k behind.   The table below shows ice extents by regions comparing 2018 with 11-year average (2007 to 2017 inclusive) and 2017.

Region 2018120 Day 120 
Average
2018-Ave. 2017120 2018-2017
 (0) Northern_Hemisphere 13360026 13650051 -290025 13519865 -159839
 (1) Beaufort_Sea 1069887 1067233 2654 1070445 -558
 (2) Chukchi_Sea 897588 962679 -65091 960509 -62921
 (3) East_Siberian_Sea 1084975 1085634 -659 1083984 991
 (4) Laptev_Sea 895710 891029 4680 897556 -1846
 (5) Kara_Sea 934470 908342 26128 933484 986
 (6) Barents_Sea 710238 526176 184062 570066 140172
 (7) Greenland_Sea 589041 657057 -68015 678737 -89696
 (8) Baffin_Bay_Gulf_of_St._Lawrence 1249752 1242545 7206 1452133 -202382
 (9) Canadian_Archipelago 853109 845536 7573 853214 -106
 (10) Hudson_Bay 1258712 1239854 18857 1260903 -2192
 (11) Central_Arctic 3219128 3237929 -18801 3248013 -28885
 (12) Bering_Sea 58432 556317 -497885 256470 -198037
 (13) Baltic_Sea 35281 21596 13685 18836 16446
 (14) Sea_of_Okhotsk 501401 404448 96953 232763 268638

2018 is 390k km2 below average (2%) and 160k below last year.  The deficits are entirely due to Bering Sea, which is down 500k km2 to average and 200k to 2017.  OTOH both Okhotsk and Barents are showing much more ice.  The graph below show April 2018 is on average once Bering and Okhotsk are removed form the calculations

 

 

The latest diesel-electric Ilya Muromets icebreaker of the Northern fleet began trials in the ice of the eastern Barents Sea. It approached the ice edge of average thickness, the Northern fleet said.  “The ice is from 50 to 100 centimeters thick in the area. Ice compaction is 9-10 points. Thus, trial conditions are favorable and correspond to the technical capabilities of the icebreaker. The trials are to continue until the end of the month and the icebreaker will return to Murmansk after them,” it said.  From https://ift.tt/1jZd0Tu

via Science Matters

https://ift.tt/2KrbZTT

May 1, 2018 at 11:42AM

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