Precipitation Sensitivity to the Mean Radius of Drop Spectra: Comparison of Single- and Double-Moment Bulk Microphysical SchemesReport as inadecuate




Precipitation Sensitivity to the Mean Radius of Drop Spectra: Comparison of Single- and Double-Moment Bulk Microphysical Schemes - Download this document for free, or read online. Document in PDF available to download.

Institute of Meteorology, University of Belgrade, 16 Dobračina, Belgrade 11000, Serbia





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Academic Editor: Robert W. Talbot

Abstract In this study, two bulk microphysical schemes were compared across mean radius values of the entire drop spectra. A cloud-resolving mesoscale model was used to analyze surface precipitation characteristics. The model included the following microphysical categories: water vapour, cloud droplets, raindrops, ice crystals, snow, graupel, frozen raindrops and hail. Two bulk schemes were used: a single-moment scheme in which the mean radius was specified as a parameter and a double-moment scheme in which the mean radius of drops was calculated diagnostically with a fixed value for the cloud droplet number concentration. Experiments were conducted out for three values of the mean radius in the single-moment scheme and two cloud droplet number concentrations in the double-moment scheme. There were large differences in the surface precipitation for the two schemes, the simulated precipitation generated by the double-moment scheme had a higher sensitivity. The single-moment scheme generated an unrealistic collection rate of cloud droplets by raindrops and hail as well as unrealistic evaporation of rain and melting of solid hydrometeors; these processes led to inaccurate timing and amounts of surface precipitation. View Full-Text

Keywords: cloud-resolving model; convective clouds; bulk microphysical scheme; size distribution function; surface precipitation cloud-resolving model; convective clouds; bulk microphysical scheme; size distribution function; surface precipitation





Author: Nemanja Kovačević * and Mladjen Ćurić

Source: http://mdpi.com/



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