Arid
DOI10.1002/ppp.731
A 2D Model for Characterising First-order Variability in Sublimation of Buried Glacier Ice, Antarctica: Assessing the Influence of Polygon Troughs, Desert Pavements and Shallow Subsurface Salts
Kowalewski, Douglas E.1; Marchant, David R.1; Head, James W., III2; Jackson, David W.1
通讯作者Kowalewski, Douglas E.
来源期刊PERMAFROST AND PERIGLACIAL PROCESSES
ISSN1045-6740
出版年2012
卷号23期号:1页码:1-14
英文摘要

To assess the role of thermal contraction-crack polygons (sublimation polygons) in modulating sublimation of buried glacier ice in Antarctica, we applied a 2D numerical model using COMSOL Multiphysics that calculates the rate and spatial variability of vapour diffusion through porous media. Specifically, we examined vapour transport through Granite drift, a dry supraglacial till marked with thermal contraction-crack polygons that rests on glacier ice reportedly =8-million years in age. The model results show that sublimation varies with drift texture and surface topography. Initially, the rates are highest beneath relatively coarse-grained sand-wedge deposits at polygon margins, creating deep, surface troughs. As troughs approach similar to 1-m depth, the cooler atmospheric and soil temperatures that arise from solar shielding reduce the rates of ice sublimation to levels below that at polygon centres, preventing runaway ice loss at polygon margins. Including the effects of a salt-cemented horizon at 10-15-cm depth (porosity 20%) and a rocky surface pavement (75% ground coverage), our modelled ice loss at polygon centres, for example, is 0.022?mm a-1, an order of magnitude lower than previous estimates (0.14?mm a-1). This finding highlights the importance of including field-based data for drift texture, topography and microclimate variation in modelling ice sublimation. The results also suggest that stable conditions (no ice loss) at polygon centres are possible with either a 1.9 degrees C decrease in mean annual atmospheric temperature or a 12 per cent increase in mean annual relative humidity. These results indicate that the preservation of buried, multi-million-year-old ice is plausible in the coldest and driest regions of Antarctica. Copyright (C) 2011 John Wiley & Sons, Ltd.


英文关键词Antarctica Beacon Valley ancient ice sublimation thermal contraction-crack polygons numerical modelling
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000301341300001
WOS关键词MCMURDO DRY VALLEYS ; BEACON VALLEY ; TRANSANTARCTIC MOUNTAINS ; CLIMATE-CHANGE ; TAYLOR VALLEY ; GROUND ICE ; LONG-TERM ; PERMAFROST ; SNOW ; MARS
WOS类目Geography, Physical ; Geology
WOS研究方向Physical Geography ; Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/174354
作者单位1.Boston Univ, Dept Earth Sci, Boston, MA 02215 USA;
2.Brown Univ, Dept Geol Sci, Providence, RI 02912 USA
推荐引用方式
GB/T 7714
Kowalewski, Douglas E.,Marchant, David R.,Head, James W., III,et al. A 2D Model for Characterising First-order Variability in Sublimation of Buried Glacier Ice, Antarctica: Assessing the Influence of Polygon Troughs, Desert Pavements and Shallow Subsurface Salts[J],2012,23(1):1-14.
APA Kowalewski, Douglas E.,Marchant, David R.,Head, James W., III,&Jackson, David W..(2012).A 2D Model for Characterising First-order Variability in Sublimation of Buried Glacier Ice, Antarctica: Assessing the Influence of Polygon Troughs, Desert Pavements and Shallow Subsurface Salts.PERMAFROST AND PERIGLACIAL PROCESSES,23(1),1-14.
MLA Kowalewski, Douglas E.,et al."A 2D Model for Characterising First-order Variability in Sublimation of Buried Glacier Ice, Antarctica: Assessing the Influence of Polygon Troughs, Desert Pavements and Shallow Subsurface Salts".PERMAFROST AND PERIGLACIAL PROCESSES 23.1(2012):1-14.
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