Parameterization of Cloud Microphysics Based on the Prediction of Bulk Ice Particle Properties. Part III: Introduction of Multiple Free CategoriesSource: Journal of the Atmospheric Sciences:;2015:;Volume( 073 ):;issue: 003::page 975DOI: 10.1175/JAS-D-15-0204.1Publisher: American Meteorological Society
Abstract: he predicted particle properties (P3) scheme introduced in Part I of this series represents all ice hydrometeors using a single ?free? category, in which the bulk properties evolve smoothly through changes in the prognostic variables, allowing for the representation of any type of ice particle. In this study, P3 has been expanded to include multiple free ice-phase categories allowing particle populations with different sets of bulk properties to coexist, thereby reducing the detrimental effects of property dilution. The modified version of P3 is the first scheme to parameterize ice-phase microphysics using multiple free categories.The multicategory P3 scheme is described and its overall behavior is illustrated. It is shown using an idealized 1D kinematic model that the overall simulation of total ice mass, reflectivity, and surface precipitation converges with additional categories. The correct treatment of the rime splintering process, which promotes multiple ice modes, is shown to require at least two categories in order to be included without introducing problems associated with property dilution. Squall-line simulations using a 3D dynamical model with one, two, and three ice categories produce reasonable reflectivity structures and precipitation rates compared to radar observations. In the multicategory simulations, ice hydrometeors from different categories and with different bulk properties are shown to coexist at the same points, with effects on reflectivity structure and precipitation. The new scheme thus appears to work reasonably in a full 3D model and is ready to be tested more widely for research and operational applications.
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contributor author | Milbrandt, J. A. | |
contributor author | Morrison, H. | |
date accessioned | 2017-06-09T16:59:00Z | |
date available | 2017-06-09T16:59:00Z | |
date copyright | 2016/03/01 | |
date issued | 2015 | |
identifier issn | 0022-4928 | |
identifier other | ams-77419.pdf | |
identifier uri | http://onlinelibrary.yabesh.ir/handle/yetl/4219975 | |
description abstract | he predicted particle properties (P3) scheme introduced in Part I of this series represents all ice hydrometeors using a single ?free? category, in which the bulk properties evolve smoothly through changes in the prognostic variables, allowing for the representation of any type of ice particle. In this study, P3 has been expanded to include multiple free ice-phase categories allowing particle populations with different sets of bulk properties to coexist, thereby reducing the detrimental effects of property dilution. The modified version of P3 is the first scheme to parameterize ice-phase microphysics using multiple free categories.The multicategory P3 scheme is described and its overall behavior is illustrated. It is shown using an idealized 1D kinematic model that the overall simulation of total ice mass, reflectivity, and surface precipitation converges with additional categories. The correct treatment of the rime splintering process, which promotes multiple ice modes, is shown to require at least two categories in order to be included without introducing problems associated with property dilution. Squall-line simulations using a 3D dynamical model with one, two, and three ice categories produce reasonable reflectivity structures and precipitation rates compared to radar observations. In the multicategory simulations, ice hydrometeors from different categories and with different bulk properties are shown to coexist at the same points, with effects on reflectivity structure and precipitation. The new scheme thus appears to work reasonably in a full 3D model and is ready to be tested more widely for research and operational applications. | |
publisher | American Meteorological Society | |
title | Parameterization of Cloud Microphysics Based on the Prediction of Bulk Ice Particle Properties. Part III: Introduction of Multiple Free Categories | |
type | Journal Paper | |
journal volume | 73 | |
journal issue | 3 | |
journal title | Journal of the Atmospheric Sciences | |
identifier doi | 10.1175/JAS-D-15-0204.1 | |
journal fristpage | 975 | |
journal lastpage | 995 | |
tree | Journal of the Atmospheric Sciences:;2015:;Volume( 073 ):;issue: 003 | |
contenttype | Fulltext |