globalchange  > 影响、适应和脆弱性
DOI: 10.5194/tc-9-1203-2015
Scopus记录号: 2-s2.0-84937161463
论文题名:
Changes in the firn structure of the western Greenland Ice Sheet caused by recent warming
作者: De La Peña S; , Howat I; M; , Nienow P; W; , Van Den Broeke M; R; , Mosley-Thompson E; , Price S; F; , Mair D; , Noël B; , Sole A; J
刊名: Cryosphere
ISSN: 19940416
出版年: 2015
卷: 9, 期:3
起始页码: 1203
结束页码: 1211
语种: 英语
英文关键词: cryosphere ; firn ; freezing ; geoaccumulation ; glacier mass balance ; global warming ; ice sheet ; meltwater ; percolation ; radar ; Arctic ; Greenland ; Greenland Ice Sheet
英文摘要: Atmospheric warming over the Greenland Ice Sheet during the last 2 decades has increased the amount of surface meltwater production, resulting in the migration of melt and percolation regimes to higher altitudes and an increase in the amount of ice content from refrozen meltwater found in the firn above the superimposed ice zone. Here we present field and airborne radar observations of buried ice layers within the near-surface (0-20 m) firn in western Greenland, obtained from campaigns between 1998 and 2014. We find a sharp increase in firn-ice content in the form of thick widespread layers in the percolation zone, which decreases the capacity of the firn to store meltwater. The estimated total annual ice content retained in the near-surface firn in areas with positive surface mass balance west of the ice divide in Greenland reached a maximum of 74 ± 25 Gt in 2012, compared to the 1958-1999 average of 13 ± 2 Gt, while the percolation zone area more than doubled between 2003 and 2012. Increased melt and column densification resulted in surface lowering averaging -0.80 ± 0.39 m yr-1 between 1800 and 2800 m in the accumulation zone of western Greenland. Since 2007, modeled annual melt and refreezing rates in the percolation zone at elevations below 2100 m surpass the annual snowfall from the previous year, implying that mass gain in the region is retained after melt in the form of refrozen meltwater. If current melt trends over high elevation regions continue, subsequent changes in firn structure will have implications for the hydrology of the ice sheet and related abrupt seasonal densification could become increasingly significant for altimetry-derived ice sheet mass balance estimates. © Author(s) 2015.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75286
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: Byrd Polar and Climate Center, Ohio State University, Scott Hall, 1090 Carmack Road, Columbus, OH, United States; School of Earth Sciences, Ohio State University, 125 South Oval Mall, Columbus, OH, United States; School of GeoSciences, University of Edinburgh, Geography Building, Drummond Street, Edinburgh, United Kingdom; Institute for Marine and Atmospheric Research Utrecht (IMAU), Utrecht University, P.O. Box 80000, Utrecht, Netherlands; Fluid Dynamics Group, Los Alamos National Laboratory, T-3, Mail Stop B216, Los Alamos, United States; College of Physical Sciences, University of Aberdeen, King's College, Fraser Noble Building, Aberdeen, United Kingdom; Department of Geography, University of Sheffield, Sheffield, United Kingdom

Recommended Citation:
De La Peña S,, Howat I,M,et al. Changes in the firn structure of the western Greenland Ice Sheet caused by recent warming[J]. Cryosphere,2015-01-01,9(3)
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