The authors wish to thank Ron Stouffer of the Geophysical Fluid Dynamics Laboratory for providing access to the model data, as well as John Fyfe and an anonymous reviewer for constructive criticism of the manuscript. The observed sea ice edge data shown in Fig. 10a were derived from SMMR/SSMI ice concentration data provided by the National Snow Ice Data Center, University of Colorado, Boulder, Colorado. This work is supported by NSF Grant ATM 00-02833. Alex Hall was also partly supported by a Lamont-Doherty Postdoctoral Fellowship while this work was carried out.
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