气候变化领域集成服务门户(CCPortal): The role of electrical conductivity in radar wave reflection from glacier beds

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DOI	10.5194/tc-14-4495-2020
	The role of electrical conductivity in radar wave reflection from glacier beds
	Tulaczyk S.M.; Foley N.T.
发表日期	2020
ISSN	19940416
起始页码	4495
结束页码	4506
卷号	14 期号:12
英文摘要	We have examined a general expression giving the specular reflection coefficient for a radar wave approaching a reflecting interface with normal incidence. The reflecting interface separates two homogeneous isotropic media, the properties of which are fully described by three scalar quantities: dielectric permittivity, magnetic permeability, and electrical conductivity. The derived relationship indicates that electrical conductivity should not be neglected a priori in glaciological investigations of subglacial materials and in ground-penetrating radar (GPR) studies of saturated sediments and bedrock, even at the high end of typical linear radar frequencies used in such investigations (e.g., 100-400 MHz). Our own experience in resistivity surveying in Antarctica, combined with a literature review, suggests that a wide range of geologic materials can have electrical conductivity that is high enough to significantly impact the value of radar reflectivity. Furthermore, we have given two examples of prior studies in which inclusion of electrical conductivity in calculation of the radar bed reflectivity may provide an explanation for results that may be considered surprising if the impact of electrical conductivity on radar reflection is neglected. The commonly made assumption that only dielectric permittivity of the two media needs to be considered in interpretation of radar reflectivity can lead to erroneous conclusions. © Author(s) 2020.
英文关键词	dielectric property; electrical conductivity; glacier; ground penetrating radar; magnetic field; radar altimetry; wave reflection
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/202227
作者单位	Department of Earth and Planetary Sciences, University of California, Santa Cruz, CA 95064, United States
推荐引用方式 GB/T 7714	Tulaczyk S.M.,Foley N.T.. The role of electrical conductivity in radar wave reflection from glacier beds[J],2020,14(12).
APA	Tulaczyk S.M.,&Foley N.T..(2020).The role of electrical conductivity in radar wave reflection from glacier beds.Cryosphere,14(12).
MLA	Tulaczyk S.M.,et al."The role of electrical conductivity in radar wave reflection from glacier beds".Cryosphere 14.12(2020).