气候变化领域集成服务门户(CCPortal): In situ field measurements of the temporal evolution of low-frequency sea-ice dielectric properties in relation to temperature, salinity, and microstructure

CCPortal

DOI	10.5194/tc-10-2923-2016
	In situ field measurements of the temporal evolution of low-frequency sea-ice dielectric properties in relation to temperature, salinity, and microstructure
	O'Sadnick M.; Ingham M.; Eicken H.; Pettit E.
发表日期	2016
ISSN	19940416
卷号	10 期号:6
英文摘要	The seasonal evolution of sea-ice microstructure controls key ice properties, including those governing ocean-atmosphere heat and gas exchange, remote-sensing signatures, and the role of the ice cover as a habitat. Non-destructive in situ monitoring of sea-ice microstructure is of value for sea-ice research and operations but remains elusive to date. We examine the potential for the electric properties of sea ice, which is highly sensitive to the brine distribution within the ice, to serve as a proxy for microstructure and, hence, other ice transport properties. Throughout spring of 2013 and 2014, we measured complex dielectric permittivity in the range of 10 to 95ĝ€kHz in landfast ice off the coast of Barrow (Utqiagvik), Alaska. Temperature and salinity measurements and ice samples provide data to characterize ice microstructure in relation to these permittivity measurements. The results reveal a significant correlation between complex dielectric permittivity, brine volume fraction, and microstructural characteristics including pore volume and connectivity, derived from X-ray microtomography of core samples. The influence of temperature and salinity variations as well as the relationships between ice properties, microstructural characteristics, and dielectric behavior emerge from multivariate analysis of the combined data set. Our findings suggest some promise for low-frequency permittivity measurements to track seasonal evolution of a combination of mean pore volume, fractional connectivity, and pore surface area-to-volume ratio, which in turn may serve as proxies for key sea-ice transport properties. © Author(s) 2016.
学科领域	air-sea interaction; dielectric property; field method; ice cover; in situ measurement; microstructure; permittivity; remote sensing; salinity; sea ice; temperature profile; temporal evolution; Alaska; Barrow; United States
语种	英语
scopus关键词	air-sea interaction; dielectric property; field method; ice cover; in situ measurement; microstructure; permittivity; remote sensing; salinity; sea ice; temperature profile; temporal evolution; Alaska; Barrow; United States
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/119535
作者单位	Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, United States; School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington, New Zealand; International Arctic Research Center, University of Alaska Fairbanks, Fairbanks, AK, United States; Department of Geosciences, University of Alaska Fairbanks, Fairbanks, AK, United States; Northern Research Institute (Norut) Narvik, Narvik, Norway
推荐引用方式 GB/T 7714	O'Sadnick M.,Ingham M.,Eicken H.,et al. In situ field measurements of the temporal evolution of low-frequency sea-ice dielectric properties in relation to temperature, salinity, and microstructure[J],2016,10(6).
APA	O'Sadnick M.,Ingham M.,Eicken H.,&Pettit E..(2016).In situ field measurements of the temporal evolution of low-frequency sea-ice dielectric properties in relation to temperature, salinity, and microstructure.Cryosphere,10(6).
MLA	O'Sadnick M.,et al."In situ field measurements of the temporal evolution of low-frequency sea-ice dielectric properties in relation to temperature, salinity, and microstructure".Cryosphere 10.6(2016).