What drove the dramatic retreat of arctic sea ice during summer 2007?

@article{Zhang2008WhatDT,
  title={What drove the dramatic retreat of arctic sea ice during summer 2007?},
  author={Jinlun Zhang and Ronald W. Lindsay and Michael Steele and Axel Schweiger},
  journal={Geophysical Research Letters},
  year={2008},
  volume={35}
}
A model study has been conducted of the unprecedented retreat of arctic sea ice in the summer of 2007. It is found that preconditioning, anomalous winds, and ice‐albedo feedback are mainly responsible for the retreat. Arctic sea ice in 2007 was preconditioned to radical changes after years of shrinking and thinning in a warm climate. During summer 2007 atmospheric changes strengthened the transpolar drift of sea ice, causing more ice to move out of the Pacific sector and the central Arctic… 

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