Contact: Dr. Sergey Matrosov
SNOWRAD was an ETL field experiment performed near Boulder, Colorado from late
January to late March 1996. Its purpose is to test a new technique for
improving radar estimations of snowfall rates using two wavelengths.
Conventional radar snowfall estimations are based on the use of a single
wavelength and simple regressions between the radar's reflectivity measurement
and independently measured snowfall rates. These are subject to very large
errors due to the natural variability of snowflake sizes. The use of an
additional shorter wavelength, outside of the Rayleigh scattering regime,
provides an independent estimate of the snowflakes' characteristic size which
reduces the uncertainties in the problem. ETL operated its
radars in concert to provide dual-wavelength (3.2 cm and 0.87 cm) radar
observations of snowstorms and snow showers while measuring the snowfall rates
with gages at the ground. These data are being used to test and refine ETL's
theoretical studies of the technique.