J14.4 Numerical Simulation Interaction between Drop and Ice Particles and its Influence on Formation of strong Precipitation

Wednesday, 26 January 2011: 5:00 PM
605/610 (Washington State Convention Center)
Ganna Pirnach, Ukrainian Hydrometeorological Institute, Kyiv, Ukraine; and T. Belyi

Handout (1.8 MB)

A recent work continues theoretical studies of heavy precipitation caused floods and damages in mountain regions of Ukraine (Carpathian, Crimea etc.). Three-dimensional nowacasting and forecasting numerical models developed in UHRI were adapted for theoretical interpretation of the investigated phenomena. Relative role of different mechanisms of cloud and precipitation formation and relative role of cloud drops, raindrops, crystals, ice nuclei, cloud condensation nuclei have been subjected for investigation. Series of numerical experiments have been carried out with different relationships between ice particles and drops. Relationships varied by including or excluding from calculations of different mechanism of cloud and precipitation formation. Experiments have shown that coagulation of large drop with small drops depicted best probability of getting up of dangerous precipitation. Probability of this precipitation was increasing if one mechanism has been dominated only.
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