This research was supported, in part, by NOAA Grant COMM-NA89RA-H-09086 to the Illinois State Water Survey, by the ARM Program of the U.S. Department of Energy through Battelle PNL Contract 144880-A-Q1 to the Cooperative Institute for Mesoscale Meteorological Studies (CIMMS) at the University of Oklahoma, and by a travel grant from the Indiana University (IU) Center for Transportation Research. We appreciate the time and assistance of the staff at the National Snow and Ice Data Center, CIRES, University of Colorado, Boulder, who made available the DMSP imagery. David L. Arnold (IU) assisted DJT in the surface observations of contrails at Bloomington, Indiana. We are grateful to the anonymous reviewers for their helpful and insightful comments on the original submitted manuscript.
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