DOI: 10.1002/jgrd.50606
论文题名: Dependence of model convergence on horizontal resolution and convective parameterization in simulations of a tropical cyclone at gray-zone resolutions
作者: Sun Y. ; Yi L. ; Zhong Z. ; Hu Y. ; Ha Y.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 14 起始页码: 7715
结束页码: 7732
语种: 英语
英文关键词: Convective parameterization
; Intensity
; Model convergence
; Resolution
; Tropical cyclone
; WRF
Scopus关键词: Hurricanes
; Optical resolving power
; Parameterization
; Storms
; Convective parameterization
; Intensity
; Model convergence
; Tropical cyclone
; WRF
; Computer simulation
; energy flux
; numerical model
; parameterization
; resolution
; storm
; tropical cyclone
; typhoon
英文摘要: The Advanced Research WRF is used to examine the sensitivity of simulations of Typhoon Shanshan (2006) to changes in horizontal grid spacing at gray-zone resolutions (7.5-1 km) and to choices of convective parameterization (CP) schemes. It is illustrated that fine resolution (3 to 1 km) runs feature a weak model convergence in tropical cyclone (TC) intensity than coarse resolution (7.5 to 5 km) runs, and the simulations using the Grell 3D ensemble CP (GR3D) exhibit a relatively strong model convergence, compared to the other three CP schemes. Further analyses reveal that model convergence relies on a number of factors that limit or promote TC intensification as resolution varies. Smaller radius of maximum wind (RMW) and thus smaller eyewall slope, along with smaller surface energy flux outside the eyewall and smaller eyewall asymmetries, are associated with finer resolution runs. These factors, especially the smaller RMW, promote the radial gradients of kinematical and microphysical attributes such as wind, pressure, latent heating, and mixing ratio of hydrometeors near the eyewall, causing growth of storm intensity, resulting in a weak model convergence. However, the impacts of the factors promoting storm intensification are notably different under different CP conditions, which are appreciably weaker in GR3D runs than in other three groups of CP experiments and responsible for a relatively strong model convergence in GR3D simulations. Overall, improvement of current CP schemes in simulation of TCs at gray-zone resolutions is needed and targeted by a further study in future. Key Points TC strengthens excessively at higher resolution with improper convective schemes Small RMW (eyewall slope) leads to weak model convergence in TC intensity change Improvement of current CP schemes at grey-zone resolutions is needed ©2013. American Geophysical Union. All Rights Reserved. 资助项目: 41175090
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63516
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: College of Meteorology and Oceanography, PLA University of Science and Technology, Nanjing, China; Chinese Academy of Meteorological Sciences, 46 South Zhongguancun Ave, Haidian District, Beijing 100081, China
Recommended Citation:
Sun Y.,Yi L.,Zhong Z.,et al. Dependence of model convergence on horizontal resolution and convective parameterization in simulations of a tropical cyclone at gray-zone resolutions[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(14)