globalchange  > 影响、适应和脆弱性
DOI: 10.5194/tc-12-955-2018
Scopus记录号: 2-s2.0-85044349357
论文题名:
Meltwater storage in low-density near-surface bare ice in the Greenland ice sheet ablation zone
作者: Cooper M; G; , Smith L; C; , Rennermalm A; K; , Mige C; , Pitcher L; H; , Ryan J; C; , Yang K; , Cooley S; W
刊名: Cryosphere
ISSN: 19940416
出版年: 2018
卷: 12, 期:3
起始页码: 955
结束页码: 970
语种: 英语
英文摘要: We document the density and hydrologic properties of bare, ablating ice in a mid-elevation (1215 m a.s.l.) supraglacial internally drained catchment in the Kangerlussuaq sector of the western Greenland ice sheet. We find low-density (0.43-0.91 g cm-3, μ Combining double low line 0.69 g cm-3) ice to at least 1.1 m depth below the ice sheet surface. This near-surface, low-density ice consists of alternating layers of water-saturated, porous ice and clear solid ice lenses, overlain by a thin (< 0.5 m), even lower density (0.33-0.56 g cm-3, μ Combining double low line 0.45 g cm-3) unsaturated weathering crust. Ice density data from 10 shallow (0.9-1.1 m) ice cores along an 800 m transect suggest an average 14-18 cm of specific meltwater storage within this low-density ice. Water saturation of this ice is confirmed through measurable water levels (1-29 cm above hole bottoms, μ Combining double low line 10 cm) in 84 % of cryoconite holes and rapid refilling of 83 % of 1 m drilled holes sampled along the transect. These findings are consistent with descriptions of shallow, depth-limited aquifers on the weathered surface of glaciers worldwide and confirm the potential for substantial transient meltwater storage within porous low-density ice on the Greenland ice sheet ablation zone surface. A conservative estimate for the gμ 63 km2 supraglacial catchment yields 0.009-0.012 km3 of liquid meltwater storage in near-surface, porous ice. Further work is required to determine if these findings are representative of broader areas of the Greenland ice sheet ablation zone, and to assess the implications for sub-seasonal mass balance processes, surface lowering observations from airborne and satellite altimetry, and supraglacial runoff processes. © 2018 Author(s).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75398
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: Department of Geography, University of California, Los Angeles, CA, United States; Department of Geography, Rutgers, the State University of New Jersey, Piscataway, NJ, United States; Department of Geography, University of Utah, Salt Lake City, UT, United States; Institute at Brown for Environment and Society, Brown University, Providence, RI, United States; School of Geographical and Oceanographic Sciences, Nanjing University, Nanjing, China; Joint Center for Global Change Studies, Beijing, China; Dept. of Earth Environmental and Planetary Sciences, Brown University, Providence, RI, United States

Recommended Citation:
Cooper M,G,, Smith L,et al. Meltwater storage in low-density near-surface bare ice in the Greenland ice sheet ablation zone[J]. Cryosphere,2018-01-01,12(3)
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