This work was supported by the NSF SHEBA (OPP-9701730 and 0084257), the NASA FIRE ACE (L64205D), the NASA EOS Validation (S-97895-F), NASA ISCCP, and NOAA SEARCH programs. Microwave and IR radiometer data were obtained from the Atmospheric Radiation Measurement Program sponsored by the U.S. Department of Energy. Radiosonde data were obtained from the University of Washington Applied Physics Laboratory (UW APL). Aircraft data were obtained from the National Center for Atmospheric Research, B. Baker, P. Lawson, and P. Zuidema are gratefully acknowledged for providing the in situ ice microphysical data, and S. Frisch and G. Feingold provided valuable insight into liquid cloud retrievals. SHEBA was greatly aided by the logistics team from the UW APL and the crew of the Canadian Coast Guard Ship Des Grosseilliers.
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