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A Comparison of Two Bulk microphysics Parameterizations for the Study of aerosol Impacts on an Idealized Supercell

Advances in Atmospheric Sciences 2022年第1期39卷 97-116页

作者： Wanchen WU Wei HUANG Baode CHEN Shanghai Typhoon Institute and Key Laboratory of Numerical Modeling for Tropical Cyclone of China Meteorological AdministrationShanghai 200030China

Idealized supercell storms are simulated with two aerosol-aware bulk microphysics schemes(BMSs),the Thompson and the Chen-Liu-Reisner(CLR),using the Weather Research and Forecast(WRF)*** objective of this study is to investigate the parameterizations of aerosol effects on cloud and precipitation characteristics and assess the necessity of introducing aerosols into a weather prediction model at fine grid *** results show that aerosols play a decisive role in the composition of clouds in terms of the mixing ratios and number concentrations of liquid and ice hydrometeors in an intense supercell *** storm consists of a large amount of cloud water and snow in the polluted environment,but a large amount of rainwater and graupel instead in the clean *** total precipitation and rain intensity are suppressed in the CLR scheme more than in the Thompson scheme in the first three hours of storm *** critical processes explaining the differences are the auto-conversion rate in the warm-rain process at the beginning of storm intensification and the low-level cooling induced by large ice *** cloud condensation nuclei(CCN)activation and auto-conversion processes of the two schemes exhibit considerable differences,indicating the inherent uncertainty of the parameterized aerosol effects among different *** the aerosol effects,the fall speed characteristics of graupel in the two schemes play an important role in the storm dynamics and precipitation via low-level *** rapid intensification of storms simulated with the Thompson scheme is attributed to the production of hail-like graupel.

关键词： numerical weather prediction aerosol particle size distribution aerosol-aware microphysics scheme supercell precipitation intensity precipitation physics

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