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SUMMARY:Impact of melt ponds on Arctic summer sea ice in the HadGEM3 globa
 l coupled climate model  - Dr. David Schroeder\, University of Reading
DTSTART:20150512T130000Z
DTEND:20150512T140000Z
UID:TALK59097@talks.cam.ac.uk
CONTACT:Dr. Pranab Deb
DESCRIPTION:Stand-alone sea ice simulations with a physical based melt pon
 d model reveal a strong correlation between the simulated spring pond frac
 tion and the observed as well as simulated September sea ice extent for th
 e period 1979 to 2014. This is explained by a positive feedback mechanism:
  more ponds reduce the albedo\; a lower albedo causes more melting\; more 
 melting increases pond fraction. This feedback process is a potential reas
 on for the acceleration of Arctic sea ice decrease in the last decade and 
 the failure of many climate models (without an implicit pond model) to sim
 ulate the observed decrease. \nWe implemented the Los Alamos sea ice model
  CICE 5 including our physical based melt pond model into the latest versi
 on of the Hadley Centre coupled climate model\, HadGEM3. The model surface
  shortwave radiation scheme has been adjusted to account for pond fraction
  and depth. A 30-year simulation with constant present-day atmospheric C02
  has been undertaken. The sensitivity of the simulated sea ice area and vo
 lume to parameters pertinent to the melt pond parameterization will be dis
 cussed and compared to those in uncoupled (forced) simulations. The analys
 is focuses on the impact of melt ponds on the summer melt\, and asks if th
 e strong correlation between spring pond fraction and September sea ice ex
 tent found in stand-alone simulations\, can be confirmed in the coupled cl
 imate simulation.
LOCATION:British Antarctic Survey\, Room 187
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