We are thankful to Prof. David Mitchell of the Desert Research Institute for providing the photographs of ice crystals and drops. This work was sponsored under U.S. Department of Energy Contracts DE-SC0004024 (ISDAC) and DE-SC0007035 (SPARTICUS) and National Aeronautics and Space Administration Contract NNX14AQ55G (SEAC4RS).
Baker, B. A., and R. P. Lawson, 2006: Improvement in determination of ice water content from two-dimensional particle imagery. Part I: Image-to-mass relationships. J. Appl. Meteor., 45, 1282–1290, doi:10.1175/JAM2398.1.
Mitchell, D. L., R. Zhang, and R. L. Pitter, 1990: Mass-dimensional relationships for ice particles and the influence of riming on snowfall rates. J. Appl. Meteor., 29, 153–163, doi:10.1175/1520-0450(1990)029<0153:MDRFIP>2.0.CO;2.