DOI: 10.5194/tc-15-247-2021
论文题名: Airborne mapping of the sub-ice platelet layer under fast ice in McMurdo Sound, Antarctica
作者: Haas C. ; Langhorne J.P. ; Rack W. ; Leonard H.G. ; Brett M.G. ; Price D. ; Beckers F.J. ; Gough J.A.
刊名: Cryosphere
ISSN: 19940416
出版年: 2021
卷: 15, 期: 1 起始页码: 247
结束页码: 264
语种: 英语
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164699
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
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]. Cryosphere,2021-01-01,15(1)