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DOI	10.1029/2019JD031996
	Influence of Lead width on the Turbulent Flow Over Sea Ice Leads: Modeling and Parametrization
	Michaelis J.; Lüpkes C.; Zhou X.; Gryschka M.; Gryanik V.M.
发表日期	2020
ISSN	2169897X
卷号	125 期号:15
英文摘要	A new turbulence parametrization is developed for a non-eddy-resolving microscale model to study the effects of leads (elongated open-water channels in sea ice) of different width on the polar atmospheric boundary layer (ABL). Lead-dominated sea ice regions are characterized by large horizontal inhomogeneities of the surface temperature causing strong convection. Therefore, the new parametrization is based on a previous formulation where inhomogeneous conditions of dry convection over leads and nonlocal effects on heat fluxes had already been taken into account for a fixed lead width. A nonlocal lead width dependent approach is applied now for both heat fluxes and momentum fluxes in the convective region. Microscale model results obtained with the new, the previous nonlocal, and a local parametrization are shown, where 10 idealized cases of a lead-perpendicular, near-neutral ABL-flow below a strong capping inversion are considered. Furthermore, time-averaged large eddy simulation (LES) results of those cases are considered for analyzing the integrated effects of the dry convection on ABL characteristics. Microscale model results obtained with the new nonlocal parametrization agree well with the LES for variable lead widths and different atmospheric forcing although there is a room for further improvement. Furthermore, several features obtained with a local closure clearly disagree with LES. Thus, the microscale study also points to difficulties that might occur in mesoscale studies over regions where leads dominate the flow regime when local closures are applied. ©2020. The Authors.
英文关键词	atmospheric boundary layer; atmospheric turbulence; large eddy simulation; microscale modeling; sea ice leads; turbulence parametrization
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185861
作者单位	Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany; Institute for Meteorology and Climatology, University of Hannover, Hannover, Germany; A. M. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences, Moscow, Russian Federation
推荐引用方式 GB/T 7714	Michaelis J.,Lüpkes C.,Zhou X.,et al. Influence of Lead width on the Turbulent Flow Over Sea Ice Leads: Modeling and Parametrization[J],2020,125(15).
APA	Michaelis J.,Lüpkes C.,Zhou X.,Gryschka M.,&Gryanik V.M..(2020).Influence of Lead width on the Turbulent Flow Over Sea Ice Leads: Modeling and Parametrization.Journal of Geophysical Research: Atmospheres,125(15).
MLA	Michaelis J.,et al."Influence of Lead width on the Turbulent Flow Over Sea Ice Leads: Modeling and Parametrization".Journal of Geophysical Research: Atmospheres 125.15(2020).