MMM SEMINAR NCAR
Paul Field
Abstract
The
parametrization of ice particle size distributions (PSDs) in large scale models
is important for the accurate prediction of precipitation rate and radiative
properties such as radar reflectivity and microwave radiances.
In
this talk aircraft measured PSDs are re-scaled using two moments computed from
the PSDs to reveal a universal distribution. Thus, a numerical model's prediction
of two moments combined with the universal distribution would yield an accurate
estimate of the PSD. In large scale models it is difficult to predict two
moments, but it will be shown that a single moment of a PSD, such as ice water
content, can be related to other moments through the use of temperature
dependent power laws. This method provides a successful prediction of a ice
PSDs given only predictions of ice water content and temperature.
Wednesday, 15 December 2004,
3:30 PM
Refreshments 3:15 PM
NCAR-Foothills Laboratory
3450 Mitchell Lane
Bldg 2 Auditorium (Rm1022)