Arctic Ice Persisting in July

AARI072008to2018

In June 2018, Arctic ice extent held up against previous years despite the Pacific basins of Bering and Okhotsk being ice-free.  Now in July when ice extent typically declines, 2018 extents are essentially flat.  The Arctic core is showing little change, perhaps due to increased thickness (volume) as reported by DMI.  The image above from AARI shows ice extents first week of July for years 2008 through 2018. (Image format was different for previous years.

The graph below shows how the Arctic extent has faired from mid June to July 7 (yesterday) compared to the 11 year average and to some years of interest.
Arctic day 188Note that 2018  was on average and comparable to other years from Mid June on.  Then recently ice extents have held steady just below 10M km2, while averages and other years declined.  2018 is now 288k km2 above the 11 year average,  400k km2 higher than 2017, and 624k km2 greater than 2007 at this date.   SII 2018 was tracking the same as MASIE in June but is now showing 335k km2 lower.

The table below shows ice extents by regions comparing 2018 with 11-year average (2007 to 2017 inclusive) and 2017 as of day 179.

Region 2018188 Day 179 
Average
2018-Ave. 2007188 2018-2007
 (0) Northern_Hemisphere 9465018 9181173 283844 8841116 623902
 (1) Beaufort_Sea 977561 863028 114533 871601 105960
 (2) Chukchi_Sea 635350 682991 -47641 622583 12767
 (3) East_Siberian_Sea 1037340 996766 40574 855273 182067
 (4) Laptev_Sea 545304 684244 -138941 644539 -99236
 (5) Kara_Sea 568399 477164 91236 523575 44824
 (6) Barents_Sea 54547 88754 -34206 91567 -37020
 (7) Greenland_Sea 353292 477433 -124141 506546 -153254
 (8) Baffin_Bay_Gulf_of_St._Lawrence 592755 393419 199336 411743 181013
 (9) Canadian_Archipelago 778940 756496 22444 752103 26837
 (10) Hudson_Bay 791754 543956 247798 354253 437502
 (11) Central_Arctic 3128568 3203921 -75353 3202400 -73832

2018 is above the 11 year average,  with BCE (Beaufort, Chukchi, East Siberian) higher, Laptev and Kara offsetting.  Barents and Greenland Sea are down, but Baffin and Hudson Bays have larger surpluses.

Footnote: 

Arctic extents are shaped by the three Ws: Water, Wind and Weather.  This video shows how a massive cyclone in 2012 broke up the ice, moved it around and flushed much of it out through the Fram strait.The ice has recovered since then and is now quite thick.

 

 

 

via Science Matters

https://ift.tt/2KHmrKI

July 8, 2018 at 11:02AM

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