Arctic Ice Grows in Movember

Click on image to enlarge.

Arctic Ice Extents have more than doubled since the Sept. minimum and are now up to 10.4M km2.  The last 30% of maximum will take until March, principally because several basins are frozen over and cannot add coverage.  To date, Beaufort and CAA (Canadian Archipelago) are full, as are Laptev and East Siberian on the Russian side.  Kara is 88% covered and the Central Arctic will add only 2% from here.

In the last nine days of November we can see Chukchi at the top adding ice up to 50% of maximum with Beaufort  and East Siberian already frozen.  On the left, Baffin and especially Hudson bay are now growing more strongly.  On the right is Kara filling in with Barents freezing more slowly.

The graph compares extents over the first 25 days of November.

2017 has reached 10.4M km2, 2007 and 2012 nearly the same, and all are close to the 10 year average of 10.6M km2.  2016 is about 1M km2 behind.  At this point MASIE and SII are both tracking the 10-year average, with SII about 200k km2 lower.

The Table below shows where ice is located on day 321 in regions of the Arctic ocean. 10 year average comes from 2007 through 2016 inclusive.

Region 2017329 Day 329
Average
2017-Ave. 2016329 2017-2016
 (0) Northern_Hemisphere 10438529 10596102 -157573 9474596 963933
 (1) Beaufort_Sea 1070410 1068478 1932 1070445 -35
 (2) Chukchi_Sea 516620 793296 -276676 653560 -136940
 (3) East_Siberian_Sea 1065427 1082091 -16665 1087137 -21711
 (4) Laptev_Sea 897845 897451 394 897211 634
 (5) Kara_Sea 826360 732408 93952 328154 498207
 (6) Barents_Sea 191448 209544 -18096 31173 160275
 (7) Greenland_Sea 414638 542031 -127393 419401 -4763
 (8) Baffin_Bay_Gulf_of_St._Lawrence 701761 637760 64001 651237 50524
 (9) Canadian_Archipelago 852553 851808 745 853180 -628
 (10) Hudson_Bay 632312 422809 209504 267718 364594
 (11) Central_Arctic 3182452 3192004 -9552 3082022 100430

The deficits to average are primarily in Chukchi and Greenland Seas. Surpluses are large in Hudson and Baffin Bays, along with Kara Sea.  Compared to last year, Kara, Barents and Hudson Bay all have much greater ice extents.

Footnote

Some people unhappy with the higher amounts of ice extent shown by MASIE continue to claim that Sea Ice Index is the only dataset that can be used. This is false in fact and in logic. Why should anyone accept that the highest quality picture of ice day to day has no shelf life, that one year’s charts can not be compared with another year? Researchers do this analysis, including Walt Meier in charge of Sea Ice Index. That said, I understand his interest in directing people to use his product rather than one he does not control. As I have said before:

MASIE is rigorous, reliable, serves as calibration for satellite products, and uses modern technologies to continue the long and honorable tradition of naval ice charting.  More on this at my post Support MASIE Arctic Ice Dataset

Movember Foundation encourages growing mustaches in support of men’s health and fitness.

 

via Science Matters

http://ift.tt/2A7TykL

November 26, 2017 at 11:07AM

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