DOI: 10.1002/jgrd.50645
论文题名: Relationships between the large-scale atmosphere and the small-scale convective state for Darwin, Australia
作者: Davies L. ; Jakob C. ; May P. ; Kumar V.V. ; Xie S.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 20 起始页码: 11534
结束页码: 11545
语种: 英语
英文关键词: convective scale
; large-scale atmosphere
; relationships
Scopus关键词: Atmospheric stability
; Convective parameterization
; Convective precipitation
; convective scale
; relationships
; Small-scale convection
; Spatial and temporal scale
; Weather and climate models
; atmospheric dynamics
; climate modeling
; convective system
; data set
; parameterization
; precipitation (climatology)
; precipitation intensity
; tropical meteorology
; Australia
; Darwin
; Northern Territory
英文摘要: A persistent problem for numerical weather and climate models is the representation of tropical convective precipitation which for the most part occurs on spatial and temporal scales too small and too short to be explicitly resolved. Given that model parameterizations represent this subgrid convection as a function of the large-scale atmospheric state, an understanding of the strongest relationships between the two scales is needed. This study introduces a method to create two concurrent long-term data sets that describe both the large-scale atmosphere and the characteristics of the small-scale convection. Important relationships between these two scales are then investigated. It is found that convective precipitation, through convective precipitation area, has the strongest relationship with dynamical variables such as moisture convergence and vertical velocity at midlevels. The magnitude of the fluctuations of convective strength about the mean is found to be anticorrelated with the strength of the large-scale variables, indicating a more stochastic behavior of tropical convection in weakly than strongly forced regimes, respectively. Atmospheric stability related variables are not found to be positively related to either convective precipitation area or convective precipitation intensity, which is often an assumption made in convective parameterization. On the contrary, in a more unstable atmosphere, there is lower convective precipitation. Key Points Long-term data describes the large- and the small-scale at a tropical location Investigation found strong relationships between convection and dynamics The variability of convection is dependent on the strength of the forcing ©2013. American Geophysical Union. All Rights Reserved. 资助项目: DESC0002731
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63200
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: School of Mathematics, Monash University, Melbourne VIC, Australia; ARC Centre of Excellence for Climate System Science, Monash University, Melbourne VIC, Australia; Centre for Australian Weather and Climate Research, Bureau of Meteorology, Melbourne VIC, Australia; Atmospheric Sciences Division, Lawrence Livermore National Laboratory, Livermore CA, United States; School of Earth Sciences, University of Melbourne, Melbourne 3010, VIC, Australia
Recommended Citation:
Davies L.,Jakob C.,May P.,et al. Relationships between the large-scale atmosphere and the small-scale convective state for Darwin, Australia[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(20)