Barents Sea Ice Stays Put

Barents104to113

In the last nine days, sea ice in Barents persists, remaining above 700k km2, well above the decadal average and the previously high 2014.  The melting is confined mostly to Bering Sea on the Pacific side, and less so in Okhotsk next door.

BeringOk104to113

The April pattern of ice extent decline is shown is graph below:

NH ice1132018

2018 is tracking close to 2007 and 2017, all more than 400k km2 below the 11 year average (2007 through 2017 inclusive).  SII is showing ~200k km2 less ice throughout.  The graph below shows 2018 ice extent is close to the decadal average, except for Bering and Okhotsk Sea, the two Pacific basins.

NH less BO 1132018

The table below shows regional  ice extents on day 113 comparing to decadal averages and 2017.

Region 2018113 Day 113 
Average
2018-Ave. 2017113 2018-2017
 (0) Northern_Hemisphere 13515699 14083321 -567621 13651810 -136111
 (1) Beaufort_Sea 1070445 1069106 1339 1070445 0
 (2) Chukchi_Sea 954262 965239 -10977 961723 -7461
 (3) East_Siberian_Sea 1086737 1086195 542 1083967 2770
 (4) Laptev_Sea 897845 894453 3392 897326 518
 (5) Kara_Sea 934867 916778 18090 932153 2715
 (6) Barents_Sea 724756 572825 151931 546422 178334
 (7) Greenland_Sea 516420 670606 -154186 673722 -157302
 (8) Baffin_Bay_Gulf_of_St._Lawrence 1239506 1338185 -98679 1444616 -205110
 (9) Canadian_Archipelago 853109 850093 3015 853214 -106
 (10) Hudson_Bay 1244858 1252135 -7277 1258453 -13595
 (11) Central_Arctic 3208617 3242368 -33751 3245713 -37096
 (12) Bering_Sea 88256 689111 -600856 374254 -285998
 (13) Baltic_Sea 44869 32599 12270 23289 21579
 (14) Sea_of_Okhotsk 648464 499591 148873 283164 365300

Overall, the 2018 deficit to average is 4%,  or 570 k km2. The difference is entirely due to open water in Bering Sea, now a deficit of 600k km2 (down by 90%).  Barents and Okhotsk are both above average, by ~30% with Greenland Sea down about 20%.  It remains to be seen how fast or slow will be the melting of the Arctic core regions, solidly frozen at this point in the year.

20180424en
Current Arctic ice conditions according to AARI, St. Petersburg, Russia. Old ice shown in brown.

 

via Science Matters

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April 24, 2018 at 01:25PM

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