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SUMMARY:Simple rules govern the patterns of Arctic sea ice melt ponds - Pr
 edrag Popovic (University of Chicago)
DTSTART:20170914T130000Z
DTEND:20170914T133000Z
UID:TALK79201@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:<span>Co-authors: BB Cael		(MIT)\, Mary Silber		(University of
  Chicago)\, Dorian Abbot		(University of Chicago)        <br></span><span>
 <br>Climate change\, amplified in the far north\, has led to a rapid sea i
 ce decline in recent years. Melt ponds that form on the surface of Arctic 
 sea ice in the summer significantly lower the ice albedo\, thereby acceler
 ating ice melt. Pond geometry controls the details of this crucial feedbac
 k. However\, a question of modeling pond geometry remains unresolved. Here
  we show that an extremely simple model of voids surrounding randomly size
 d and placed overlapping circles reproduces the essential features of pond
  patterns. The model has only two parameters\, circle scale and the fracti
 on of the surface covered by voids\, which we choose by comparing the mode
 l to pond images. Using these parameters the void model robustly reproduce
 s all of the examined pond features such as the ponds&#39\; area-perimeter
  relationship and the area-abundance relationship over nearly 7 orders of 
 magnitude. By analyzing airborne photographs of sea ice\, we also find tha
 t the pond width distribution is surpris ingly constant across different y
 ears\, regions\, and ice types. These results demonstrate that the geometr
 ic and abundance patterns of Arctic melt ponds can be simply described\, a
 nd can guide future models of Arctic melt ponds to improve predictions of 
 how sea ice will respond to Arctic warming.</span>
LOCATION:Seminar Room 1\, Newton Institute
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