气候变化领域集成服务门户(CCPortal): Meltwater storage in low-density near-surface bare ice in the Greenland ice sheet ablation zone

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DOI	10.5194/tc-12-955-2018
	Meltwater storage in low-density near-surface bare ice in the Greenland ice sheet ablation zone
	Cooper M.G.; Smith L.C.; Rennermalm A.K.; Mige C.; Pitcher L.H.; Ryan J.C.; Yang K.; Cooley S.W.
发表日期	2018
ISSN	19940416
卷号	12 期号:3
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).
学科领域	ablation; catchment; ice sheet; mass balance; meltwater; runoff; satellite altimetry; transect; Arctic; Greenland; Greenland Ice Sheet; Kangerlussuaq Fjord
语种	英语
scopus关键词	ablation; catchment; ice sheet; mass balance; meltwater; runoff; satellite altimetry; transect; Arctic; Greenland; Greenland Ice Sheet; Kangerlussuaq Fjord
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/119198
作者单位	Department of Geography, University of California, Los Angeles, CA 90095, United States; Department of Geography, Rutgers, the State University of New Jersey, Piscataway, NJ 08854, 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, 210023, China; Joint Center for Global Change Studies, Beijing, 100875, China; Dept. of Earth Environmental and Planetary Sciences, Brown University, Providence, RI 02912, United States
推荐引用方式 GB/T 7714	Cooper M.G.,Smith L.C.,Rennermalm A.K.,et al. Meltwater storage in low-density near-surface bare ice in the Greenland ice sheet ablation zone[J],2018,12(3).
APA	Cooper M.G..,Smith L.C..,Rennermalm A.K..,Mige C..,Pitcher L.H..,...&Cooley S.W..(2018).Meltwater storage in low-density near-surface bare ice in the Greenland ice sheet ablation zone.Cryosphere,12(3).
MLA	Cooper M.G.,et al."Meltwater storage in low-density near-surface bare ice in the Greenland ice sheet ablation zone".Cryosphere 12.3(2018).