DOI: 10.1002/2014GL060493
论文题名: The scale dependence and structure of convergence fields preceding the initiation of deep convection
作者: Birch C.E. ; Marsham J.H. ; Parker D.J. ; Taylor C.M.
刊名: Geophysical Research Letters
ISSN: 0094-9992
EISSN: 1944-9723
出版年: 2014
卷: 41, 期: 13 起始页码: 4769
结束页码: 4776
语种: 英语
英文关键词: convection
; convection permitting
; low-level convergence
; Met Office Unified Model
; parameterization
; triggering
Scopus关键词: Earth sciences
; Geophysics
; Heat convection
; Parameterization
; Analysis of fractals
; Convective initiation
; Local Convergence
; low-level convergence
; Strong convergence
; triggering
; Unified Modeling
; West African Monsoon
; Fractal dimension
英文摘要: Links between convergence and convection are poor in global models, and poor representation of convection is the source of many model biases in the tropics. State-of-the-art convection-permitting simulations allow us to analyze realistic convection statistically. The analysis of fractal dimension is used to show that in convection-permitting simulations (grid spacings 1.5, 4, and 12 km) of the West African monsoon, 50% of deep convective initiations occur in the near vicinity of low-level boundary layer convergence lines that are orientated along the mean wind. In these simulations, more than 80% of the initiations occur within large-scale (300 × 300 km) convergence, with some 20% in large-scale divergence, and almost all cases occur within local scale (60 × 60 km) convergence. The behavior alters in a simulation with a convection scheme and a grid spacing of 12 km; initiation is less frequent over convergence lines, and there is less dependency on high-magnitude low-level local convergence. Key Points Fifty percent of storms initiate along convergence lines Most initiations occur in large and local scale convergence Parameterized convection exhibits a weaker dependence on strong convergence ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84903857250&doi=10.1002%2f2014GL060493&partnerID=40&md5=16ce5afd033167f2de1198a191de00db
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7256
Appears in Collections: 气候减缓与适应
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作者单位: MetOffice-Leeds, University of Leeds, Leeds, United Kingdom
Recommended Citation:
Birch C.E.,Marsham J.H.,Parker D.J.,et al. The scale dependence and structure of convergence fields preceding the initiation of deep convection[J]. Geophysical Research Letters,2014-01-01,41(13).