气候变化领域集成服务门户(CCPortal): Toward a method for downscaling sea ice pressure for navigation purposes

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DOI	10.5194/tc-14-3465-2020
	Toward a method for downscaling sea ice pressure for navigation purposes
	Lemieux J.-F.; Bruno Tremblay L.; Plante M.
发表日期	2020
ISSN	19940416
起始页码	3465
结束页码	3478
卷号	14 期号:10
英文摘要	Sea ice pressure poses great risk for navigation; it can lead to ship besetting and damages. Contemporary largescale sea ice forecasting systems can predict the evolution of sea ice pressure. There is, however, a mismatch between the spatial resolution of these systems (a few kilometres) and the typical dimensions of ships (a few tens of metres) navigating in ice-covered regions. In this paper, the downscaling of sea ice pressure from the kilometre-scale to scales relevant for ships is investigated by conducting high-resolution idealized numerical experiments with a viscous-plastic sea ice model. Results show that sub-grid-scale pressure values can be significantly larger than the large-scale pressure (up to4 times larger in our numerical experiments). High pressure at the sub-grid scale is associated with the presence of defects (e.g. a lead). Numerical experiments show significant stress concentration on both sides of a ship beset in sea ice, especially at the back. The magnitude of the stress concentration increases with the length of the lead (or channel) behind the ship and decreases as sea ice consolidates by either thermodynamical growth or mechanical closing. These results also highlight the difficulty of forecasting, for navigation applications, the small-scale distribution of pressure, and especially the largest values as the important parameters (i.e. the length of the lead behind the ship and the thickness of the refrozen ice) are not well constrained. © 2020 Royal Society of Chemistry. All rights reserved.
英文关键词	downscaling; forecasting method; ice mechanics; navigation aid; sea ice; spatial resolution; thermodynamics; viscous flow
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202139
作者单位	Recherche en Prevision Numerique Environnementale/Environnement et Changement Climatique Canada, 2121 route Transcanadienne, Dorval, QC, Canada; Department of Atmospheric and Oceanic Sciences, McGill University, Montréal, QC, Canada
推荐引用方式 GB/T 7714	Lemieux J.-F.,Bruno Tremblay L.,Plante M.. Toward a method for downscaling sea ice pressure for navigation purposes[J],2020,14(10).
APA	Lemieux J.-F.,Bruno Tremblay L.,&Plante M..(2020).Toward a method for downscaling sea ice pressure for navigation purposes.Cryosphere,14(10).
MLA	Lemieux J.-F.,et al."Toward a method for downscaling sea ice pressure for navigation purposes".Cryosphere 14.10(2020).