气候变化领域集成服务门户(CCPortal): Sub-Ice Platelet Layer Physics: Insights From a Mushy-Layer Sea Ice Model

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DOI	10.1029/2019JC015918
	Sub-Ice Platelet Layer Physics: Insights From a Mushy-Layer Sea Ice Model
	Wongpan P.; Vancoppenolle M.; Langhorne P.J.; Smith I.J.; Madec G.; Gough A.J.; Mahoney A.R.; Haskell T.G.
发表日期	2021
ISSN	21699275
卷号	126 期号:6
英文摘要	The sub-ice platelet layer (SIPL) is a highly porous, isothermal, friable layer of ice crystals and saltwater, that can develop to several meters in thickness under consolidated sea ice near Antarctic ice shelves. While the SIPL has been comprehensively described, details of its physics are rather poorly understood. In this contribution we describe the halo-thermodynamic mechanisms driving the development and stability of the SIPL in mushy-layer sea ice model simulations, forced by thermal atmospheric and oceanic conditions in McMurdo Sound, Ross Sea, Antarctica. The novelty of these simulations is that they predict a realistic model analogue for the SIPL. Two aspects of the model are essential: (a) a large initial brine fraction is imposed on newly forming ice, and (b) brine rejection via advective desalination. The SIPL appears once conductive heat fluxes become insufficient to remove latent heat required to freeze the highly porous new ice. Favorable conditions for SIPL formation include cold air, supercooled waters, and consolidated ice and snow that are thick enough to provide sufficient thermal insulation. Thermohaline properties resulting from large liquid fractions stabilize the SIPL, in particular a low thermal diffusivity. Intense convection within the isothermal SIPL generates the SIPL-consolidated ice contrast without transporting heat. Using standard physical constants and free parameters, the model successfully predicts the SIPL and consolidated ice thicknesses at six locations. While most simulations were performed with 50 layers, an SIPL emerged with moderate accuracy in thickness for three layers proving a low-cost representation of the SIPL in large-scale climate models. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	Antarctic sea ice; ice shelf-ocean interaction; mushy layer; platelet ice; sea ice properties; sea ice simulation
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186288
作者单位	Department of Physics, University of Otago, Dunedin, New Zealand; Institute of Low Temperature Science, Hokkaido University, Sapporo, Japan; JSPS International Research Fellow, Japan Society for the Promotion of Science, Tokyo, Japan; Now at Australian Antarctic Program Partnership, Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS, Australia; Sorbonne Université, LOCEAN-IPSL, CNRS/IRD/MNHN, Paris, France; University Grenoble Alpes, CNRS, INRIA, CNRS, Grenoble INP, LJK, Grenoble, France; Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, United States; Callaghan Innovation, Lower Hutt, New Zealand
推荐引用方式 GB/T 7714	Wongpan P.,Vancoppenolle M.,Langhorne P.J.,et al. Sub-Ice Platelet Layer Physics: Insights From a Mushy-Layer Sea Ice Model[J],2021,126(6).
APA	Wongpan P..,Vancoppenolle M..,Langhorne P.J..,Smith I.J..,Madec G..,...&Haskell T.G..(2021).Sub-Ice Platelet Layer Physics: Insights From a Mushy-Layer Sea Ice Model.Journal of Geophysical Research: Oceans,126(6).
MLA	Wongpan P.,et al."Sub-Ice Platelet Layer Physics: Insights From a Mushy-Layer Sea Ice Model".Journal of Geophysical Research: Oceans 126.6(2021).