DOI: 10.1002/jgrd.50798
论文题名: Impacts of microphysical scheme on convective and stratiform characteristics in two high precipitation squall line events
作者: Wu D. ; Dong X. ; Xi B. ; Feng Z. ; Kennedy A. ; Mullendore G. ; Gilmore M. ; Tao W.-K.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 19 起始页码: 11119
结束页码: 11135
语种: 英语
英文关键词: microphysics
; precipitation
; squall line
; WRF
Scopus关键词: Axial flow
; Computer simulation
; Physics
; Precipitation (chemical)
; Precipitation (meteorology)
; Radar
; Reflection
; Storms
; Weather forecasting
; Microphysics
; Partitioning algorithms
; Precipitation intensity
; Southern great plains
; Squall lines
; Surface precipitation
; Weather research and forecasting models
; WRF
; Ice
; algorithm
; convective system
; ensemble forecasting
; hail
; numerical model
; precipitation (climatology)
; precipitation intensity
; radar
; reflectivity
; snow
; squall line
; stratiform cloud
; weather forecasting
; Great Plains
英文摘要: This study investigates the impact of snow, graupel, and hail processes on simulated squall lines over the Southern Great Plains in the United States. The Weather Research and Forecasting (WRF) model is used to simulate two squall line events in Oklahoma during May 2007, and the simulations are validated against radar and surface observations. Several microphysics schemes are tested in this study, including the WRF 5-Class Microphysics (WSM5), WRF 6-Class Microphysics (WSM6), Goddard Cumulus Ensemble (GCE) Three Ice (3-ice) with graupel, Goddard Two Ice (2-ice), and Goddard 3-ice hail schemes. Simulated surface precipitation is sensitive to the microphysics scheme when the graupel or hail categories are included. All of the 3-ice schemes overestimate the total precipitation with WSM6 having the largest bias. The 2-ice schemes, without a graupel/hail category, produce less total precipitation than the 3-ice schemes. By applying a radar-based convective/stratiform partitioning algorithm, we find that including graupel/hail processes increases the convective areal coverage, precipitation intensity, updraft, and downdraft intensities, and reduces the stratiform areal coverage and precipitation intensity. For vertical structures, simulations have higher reflectivity values distributed aloft than the observed values in both the convective and stratiform regions. Three-ice schemes produce more high reflectivity values in convective regions, while 2-ice schemes produce more high reflectivity values in stratiform regions. In addition, this study has demonstrated that the radar-based convective/stratiform partitioning algorithm can reasonably identify WRF-simulated precipitation, wind, and microphysical fields in both convective and stratiform regions. Key Points The 3-ice scheme increases convective area, precipitation, but reduces stratiform All schemes overestimated reflectivity at midlevels, especially 2-ice schemes The partitioning scheme identifies convective and stratiform regions reasonably ©2013. American Geophysical Union. All Rights Reserved. 资助项目: NNX11AM15A
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63267
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
There are no files associated with this item.
作者单位: Department of Atmospheric Sciences, University of North Dakota, 4149 University Ave. Stop 9006, Grand Forks, ND 58202-9006, United States; NASA Goddard Space Flight Center, Greenbelt MD, United States; Pacific Northwest National Laboratory, Richland WA, United States
Recommended Citation:
Wu D.,Dong X.,Xi B.,et al. Impacts of microphysical scheme on convective and stratiform characteristics in two high precipitation squall line events[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(19)