气候变化领域集成服务门户(CCPortal): Airborne mapping of the sub-ice platelet layer under fast ice in McMurdo Sound, Antarctica

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DOI	10.5194/tc-15-247-2021
	Airborne mapping of the sub-ice platelet layer under fast ice in McMurdo Sound, Antarctica
	Haas C.; Langhorne J.P.; Rack W.; Leonard H.G.; Brett M.G.; Price D.; Beckers F.J.; Gough J.A.
发表日期	2021
ISSN	19940416
起始页码	247
结束页码	264
卷号	15 期号:1
英文摘要	p Basal melting of ice shelves can result in the outflow of supercooled ice shelf water, which can lead to the formation of a sub-ice platelet layer (SIPL) below adjacent sea ice. McMurdo Sound, located in the southern Ross Sea, Antarctica, is well known for the occurrence of a SIPL linked to ice shelf water outflow from under the McMurdo Ice Shelf. Airborne, single-frequency, frequency-domain electromagnetic induction (AEM) surveys were performed in November of 2009, 2011, 2013, 2016, and 2017 to map the thickness and spatial distribution of the landfast sea ice and underlying porous SIPL. We developed a simple method to retrieve the thickness of the consolidated ice and SIPL from the EM in-phase and quadrature components, supported by EM forward modelling and calibrated and validated by drill-hole measurements. Linear regression of EM in-phase measurements of apparent SIPL thickness and drill-hole measurements of true SIPL thickness yields a scaling factor of 0.3 to 0.4 and rms error of 0.47 span classCombining double low line inline-formula m /span . EM forward modelling suggests that this corresponds to SIPL conductivities between 900 and 1800 span classCombining double low line inline-formula mS m-1 /span , with associated SIPL solid fractions between 0.09 and 0.47. The AEM surveys showed the spatial distribution and thickness of the SIPL well, with SIPL thicknesses of up to 8 span classCombining double low line inline-formula m /span near the ice shelf front. They indicate interannual SIPL thickness variability of up to 2 span classCombining double low line inline-formula m /span . In addition, they reveal high-resolution spatial information about the small-scale SIPL thickness variability and indicate the presence of persistent peaks in SIPL thickness that may be linked to the geometry of the outflow from under the ice shelf. © 2021 Royal Society of Chemistry. All rights reserved.
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/202321
作者单位	Department of Earth and Atmospheric Science, University of Alberta, Edmonton, Canada; Department of Earth and Space Science and Engineering, York University, Toronto, Canada; Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany; Department of Environmental Physics, University of Bremen, Bremen, Germany; Department of Physics, University of Otago, Dunedin, New Zealand; Gateway Antarctica, University of Canterbury, Christchurch, New Zealand; School of Surveying, University of Otago, Dunedin, New Zealand; Canadian Forest Service, Natural Resources Canada, Edmonton, Canada
推荐引用方式 GB/T 7714	Haas C.,Langhorne J.P.,Rack W.,et al. Airborne mapping of the sub-ice platelet layer under fast ice in McMurdo Sound, Antarctica[J],2021,15(1).
APA	Haas C..,Langhorne J.P..,Rack W..,Leonard H.G..,Brett M.G..,...&Gough J.A..(2021).Airborne mapping of the sub-ice platelet layer under fast ice in McMurdo Sound, Antarctica.Cryosphere,15(1).
MLA	Haas C.,et al."Airborne mapping of the sub-ice platelet layer under fast ice in McMurdo Sound, Antarctica".Cryosphere 15.1(2021).