This research was supported by Grants ATM-9908446 and ATM-0242592 from the National Science Foundation. We wish to thank Matt Garvert (University of Washington) and Greg Thompson (NCAR), who spent many hours in the cold (along with the second author) collecting observations of snow particles during IMPROVE-2. We also thank Arthur Rangno for fruitful discussions and Thomas Wilson for assistance with the analysis of aircraft data.
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