A dynamic-flow box model and high-latitude sensitivity Emily Lane 1 , Synte Peacock 2 , and Juan M. Restrepo 3 1 Department of Atmospheric Sciences University of California Los Angeles, Los Angeles, CA 90955, U.S.A. 2 Department of the Geophysical Sciences University of Chicago, Chicago, IL 60637, U.S.A. 3 Department of Mathematics and Department of Physics University of Arizona, Tucson, AZ 85721, U.S.A.