DOI: 10.1002/2014JD022160
论文题名: On the impact of forced roll convection on vertical turbulent transport in cold air outbreaks
作者: Gryschka M. ; Fricke J. ; Raasch S.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 2169897X
出版年: 2014
卷: 119, 期: 22 起始页码: 12513
结束页码: 12532
语种: 英语
英文关键词: cold air outbreak
; large eddy simulation
; roll convection
; turbulent fluxes
Scopus关键词: air mass
; cold air
; heterogeneity
; large eddy simulation
; streamflow
; turbulent boundary layer
英文摘要: We investigated the impact of roll convection on the convective boundary layer and vertical transports in different cold air outbreak (CAO) scenarios using large eddy simulations (LES). The organization of convection into rolls was triggered by upstream heterogeneities in the surface temperature, representing ice and water. By changing the sea ice distribution in our LES, we were able to simulate a roll and a nonroll case for each scenario. Furthermore, the roll wavelength was varied by changing the scale of the heterogeneity. The characteristics of the simulated rolls and cloud streets, such as aspect ratios, orientation of the roll axes, and downstream extensions of single rolls agreed closely with observations in CAO situations. The vertical turbulent fluxes, calculated for each simulation, were decomposed into contributions from rolls and from unorganized turbulence. Even though our results confirmed that rolls triggered by upstream heterogeneities can substantially contribute to vertical turbulent fluxes, the total fluxes were not affected by the rolls. ©2014. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63023
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: Institut für Meteorologie und Klimatologie, Leibniz Universität Hannover, Hannover, Germany
Recommended Citation:
Gryschka M.,Fricke J.,Raasch S.. On the impact of forced roll convection on vertical turbulent transport in cold air outbreaks[J]. Journal of Geophysical Research Atmospheres,2014-01-01,119(22)