DOI: 10.1002/2016MS000892
Scopus记录号: 2-s2.0-85019178748
论文题名: Improvements to the snow melting process in a partially double moment microphysics parameterization
作者: Brown B ; R ; , Bell M ; M ; , Thompson G
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2017
卷: 9, 期: 2 起始页码: 1150
结束页码: 1166
语种: 英语
英文关键词: Drops
; Hurricanes
; Melting
; Numerical models
; Parameterization
; Radar
; Snow
; Storms
; Wind
; Differential reflectivity
; Drop size distribution
; Horizontal polarization
; Microphysics
; Microphysics parameterization
; Squall lines
; Stratiform precipitation
; Tropical cyclone
; Reflection
; aerosol
; cloud microphysics
; numerical model
; parameterization
; polarization
; size distribution
; snowmelt
; squall line
; tropical cyclone
; wind velocity
英文摘要: Polarimetric upgrades to the U.S. radar network have allowed new insight into the precipitation processes of tropical cyclones. Previous work by the authors compared the reflectivity at horizontal polarization and differential reflectivity observations from two hurricanes to simulated radar observations from the WRF model, and found that the aerosol-aware Thompson-Eidhammer microphysical scheme performed the best of several commonly used bulk microphysical parameterizations. Here we expand our investigation of the Thompson-Eidhammer scheme, and find that though it provided the most accurate forecast in terms of wind speed and simulated radar signatures, the scheme produces areas in which the differential reflectivity was much higher than observed. We conclude that the Thompson-Eidhammer scheme produces drop size distributions that have a larger median drop size than observed in regions of light stratiform precipitation. Examination of the vertical structure of simulated differential reflectivity indicates that the source of the discrepancy between the model and radar observations likely originates within the melting layer. The treatment of number production of rain drops from melting snow in the microphysical scheme is shown to be the ultimate source of the enhancement of differential reflectivity. A modification to the scheme is shown to result in better fidelity of the radar variables with the observations without degrading the short-term intensity forecast. Additional tests with an idealized squall line simulation are consistent with the hurricane results, suggesting the modification is generally applicable. The modifications to the Thompson-Eidhammer scheme shown here have been incorporated into updates of the WRF model starting with version 3.8.1. © 2017. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75773
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Department of Atmospheric Sciences, University of Hawai'i, Manoa, Honolulu, HI, United States; Now at National Disaster Preparedness Training Center at the University of Hawai'i, NOAA Inouye Regional Center, Honolulu, HI, United States; Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States; Research Applications Laboratory, National Center for Atmospheric Research, Boulder, CO, United States
Recommended Citation:
Brown B,R,, Bell M,et al. Improvements to the snow melting process in a partially double moment microphysics parameterization[J]. Journal of Advances in Modeling Earth Systems,2017-01-01,9(2)