Physics
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.3837a&link_type=abstract
Geophysical Research Letters, Volume 27, Issue 23, p. 3837-3840
Physics
8
Hydrology: Precipitation, Hydrology: Snow And Ice, Meteorology And Atmospheric Dynamics: Atmospheric Electricity, Meteorology And Atmospheric Dynamics: Lightning
Scientific paper
Laboratory experiments of graupel charging during ice crystal collisions reveal a charge sign dependence on temperature, liquid water concentration as well as the size distribution of the cloud droplets used for riming. The measurements were performed with an impact velocity of 8.5 ms-1, the ambient temperature was varied in the range -5 to -30°C and the effective water content up to 4 gm-3. Charge diagrams of the sign of the electric current on the graupel as a function of the ambient temperature (Ta) and the effective liquid water content (EW) for each of the two cloud droplet spectra used are presented. The results indicate that broadening the droplet spectrum leads to negative graupel charging and the implications of these findings to thunderstorm electrification are discussed.
Ávila Eldo E.
Pereyra Rodolfo G.
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