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International Arctic Research Center, University of Alaska, Fairbanks, Fairbanks, Alaska, and Department of Atmospheric Sciences, University of Illinois at Urbana—Champaign, Urbana, IllinoisCenter for Climate Research, University of Wisconsin—Madison, Madison, WisconsinDepartment of Atmospheric Sciences, University of Illinois at Urbana—Champaign, Urbana, IllinoisCORRESPONDING AUTHOR: John E. Walsh, Department of Atmospheric Sciences, University of Illinois, 105 S. Gregory Avenue, Urbana, IL 61801, E-mail: walsh@atmos.uiuc.edu
Walsh et al. (Wed,) studied this question.