DOI: 10.5194/tc-8-1031-2014
Scopus记录号: 2-s2.0-84902172174
论文题名: The sub-ice platelet layer and its influence on freeboard to thickness conversion of Antarctic sea ice
作者: Price D ; , Rack W ; , Langhorne P ; J ; , Haas C ; , Leonard G ; , Barnsdale K
刊名: Cryosphere
ISSN: 19940416
出版年: 2014
卷: 8, 期: 3 起始页码: 1031
结束页码: 1039
语种: 英语
英文关键词: GNSS
; ice shelf
; ice thickness
; ice-ocean interaction
; in situ measurement
; measurement method
; remote sensing
; satellite imagery
; sea ice
; Antarctica
; East Antarctica
; McMurdo Sound
; Ross Sea
; Southern Ocean
英文摘要: This is an investigation to quantify the influence of the sub-ice platelet layer on satellite measurements of total freeboard and their conversion to thickness of Antarctic sea ice. The sub-ice platelet layer forms as a result of the seaward advection of supercooled ice shelf water from beneath ice shelves. This ice shelf water provides an oceanic heat sink promoting the formation of platelet crystals which accumulate at the sea ice-ocean interface. The build-up of this porous layer increases sea ice freeboard, and if not accounted for, leads to overestimates of sea ice thickness from surface elevation measurements. In order to quantify this buoyant effect, the solid fraction of the sub-ice platelet layer must be estimated. An extensive in situ data set measured in 2011 in McMurdo Sound in the southwestern Ross Sea is used to achieve this. We use drill-hole measurements and the hydrostatic equilibrium assumption to estimate a mean value for the solid fraction of this sub-ice platelet layer of 0.16. This is highly dependent upon the uncertainty in sea ice density. We test this value with independent Global Navigation Satellite System (GNSS) surface elevation data to estimate sea ice thickness. We find that sea ice thickness can be overestimated by up to 19%, with a mean deviation of 12% as a result of the influence of the sub-ice platelet layer. It is concluded that within 100 km of an ice shelf this influence might need to be considered when undertaking sea ice thickness investigations using remote sensing surface elevation measurements. © 2014 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74836
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Gateway Antarctica, University of Canterbury, Christchurch, New Zealand; Department of Physics, University of Otago, Dunedin, New Zealand; Department of Earth and Space Science and Engineering, York University, Canada; National School of Surveying, University of Otago, Dunedin, New Zealand; Spatial Engineering Research Centre, University of Canterbury, Christchurch, New Zealand
Recommended Citation:
Price D,, Rack W,, Langhorne P,et al. The sub-ice platelet layer and its influence on freeboard to thickness conversion of Antarctic sea ice[J]. Cryosphere,2014-01-01,8(3)