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Title: Changes in the firn structure of the western Greenland Ice Sheet caused by recent warming

Journal Article · · The Cryosphere (Online)
 [1];  [1];  [2]; ORCiD logo [3];  [1];  [4];  [5];  [3];  [6]
  1. The Ohio State Univ., Columbus, OH (United States)
  2. The University of Edinburgh, Edinburg (United Kingdom)
  3. Utrecht University, Utrecht (The Netherlands)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. University of Aberdeen, Aberdeen (United Kingdom)
  6. The University of Sheffield, Sheffield (United Kingdom)

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, when 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. Furthermore, 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.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1208660
Alternate ID(s):
OSTI ID: 1224048
Report Number(s):
LA-UR-15-20081
Journal Information:
The Cryosphere (Online), Vol. 9, Issue 3; ISSN 1994-0424
Publisher:
European Geosciences UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 41 works
Citation information provided by
Web of Science

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Cited By (17)

Ice Core Records of West Greenland Melt and Climate Forcing journal April 2018
Prototype wireless sensors for monitoring subsurface processes in snow and firn journal October 2018
Over-winter persistence of supraglacial lakes on the Greenland Ice Sheet: results and insights from a new model journal March 2020
Drivers of Firn Density on the Greenland Ice Sheet Revealed by Weather Station Observations and Modeling journal October 2018
Greenland meltwater storage in firn limited by near-surface ice formation journal January 2016
Clouds enhance Greenland ice sheet meltwater runoff journal January 2016
Nonlinear rise in Greenland runoff in response to post-industrial Arctic warming journal December 2018
The K-transect on the western Greenland Ice Sheet: Surface energy balance (2003–2016) journal January 2018
Reconstructing Greenland Ice Sheet meltwater discharge through the Watson River (1949–2017) journal January 2018
Historical black carbon deposition in the Canadian High Arctic: a >250-year long ice-core record from Devon Island journal January 2018
On the recent contribution of the Greenland ice sheet to sea level change journal January 2016
Simulating ice layer formation under the presence of preferential flow in layered snowpacks journal January 2016
Recent precipitation decrease across the western Greenland ice sheet percolation zone journal January 2019
Firn data compilation reveals widespread decrease of firn air content in western Greenland journal January 2019
Over-winter persistence of supraglacial lakes on the Greenland Ice Sheet: Results and insights from a new model text January 2020
Direct Evidence of Meltwater Flow Within a Firn Aquifer in Southeast Greenland journal January 2018
Simulating ice layer formation under the presence of preferential flow in layered snowpacks journal August 2016

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