We would like to thank Alan Robock and the anonymous reviewers for valuable suggestions and comments, which contributed to improve our manuscript. This research was supported by the National Oceanic and Atmospheric Administration under Grant NA56GP0200, by the National Aeronautics and Space Administration under Grant NAG8-1513, and by the National Science Foundation under Grant EAR-9415441. The views expressed herein are those of the authors and do not necessarily reflect the views of these agencies.
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