World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

Glacier Dynamics at Helheim and Kangerdlugssuaq Glaciers, Southeast Greenland, Since the Little Ice Age : Volume 8, Issue 1 (21/02/2014)

By Khan, S. A.

Click here to view

Book Id: WPLBN0004022985
Format Type: PDF Article :
File Size: Pages 22
Reproduction Date: 2015

Title: Glacier Dynamics at Helheim and Kangerdlugssuaq Glaciers, Southeast Greenland, Since the Little Ice Age : Volume 8, Issue 1 (21/02/2014)  
Author: Khan, S. A.
Volume: Vol. 8, Issue 1
Language: English
Subject: Science, Cryosphere, Discussions
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2014
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Den Broeke, M. V., Box, J., Kjeldsen, K. K., Korsgaard, N. J., Kjær, K. H., Bevan, S.,...Khan, S. A. (2014). Glacier Dynamics at Helheim and Kangerdlugssuaq Glaciers, Southeast Greenland, Since the Little Ice Age : Volume 8, Issue 1 (21/02/2014). Retrieved from http://www.ebooklibrary.org/


Description
Description: DTU Space – National Space Institute, Technical University of Denmark, Department of Geodesy, Kgs. Lyngby, Denmark. Observations over the past decade show significant ice loss associated with the speed-up of glaciers in southeast Greenland from 2003, followed by a deceleration from 2006. These short-term, episodic, dynamic perturbations have a major impact on the mass balance at the decadal scale. To improve the projection of future sea level rise, a long-term data record that reveals the mass balance beyond such episodic events is required. Here, we extend the observational record of marginal thinning of Helheim glacier (HG) and Kangerdlugssuaq glacier (KG) from 10 to more than 150 yr. We show that although the frontal portion of HG thinned by more than 100 m between 2003 and 2006, it thickened by more than 50 m during the previous two decades. In contrast, KG was stable from 1981 to 1998 and experienced major thinning only after 2003. Extending the record back to the end of the Little Ice Age (ca. 1850) shows no significant thinning of HG from 1850 to 1981, while KG underwent substantial thinning of ~265 m. Analyses of their sensitivity to sub-surface water temperature anomalies and variations in air temperature suggest that both HG and KG are highly sensitive to short-term atmospheric and ocean forcing, and respond very quickly to small fluctuations. At century time-scales, however, multiple external parameters (e.g. outlet shape) dominate the mass change. These findings undermine attempts to use measurements over the last decade as initial conditions to project future dynamic ice loss.

Summary
Glacier dynamics at Helheim and Kangerdlugssuaq glaciers, southeast Greenland, since the Little Ice Age

Excerpt
Bamber, J. L., Griggs, J. A., Hurkmans, R. T. W. L., Dowdeswell, J. A., Gogineni, S. P., Howat, I., Mouginot, J., Paden, J., Palmer, S., Rignot, E., and Steinhage, D.: A new bed elevation dataset for Greenland, The Cryosphere, 7, 499–510, doi:10.5194/tc-7-499-2013, 2013.; Bevan, S. L., Luckman, A. J., and Murray, T.: Glacier dynamics over the last quarter of a century at Helheim, Kangerdlugssuaq and 14 other major Greenland outlet glaciers, The Cryosphere, 6, 923–937, doi:10.5194/tc-6-923-2012, 2012.; Bjørk, A. A., Kjær, K. H., Korsgaard, N. J., Khan, S. A., Kjeldsen, K. K., Andresen, C. S., Box, J. E., Larsen, N. K., and Funder, S.: An aerial view of 80 years of climate-related glacier fluctuations in southeast Greenland, Nat. Geosci., 5, 427–432, doi:10.1038/ngeo1481, 2012.; Boas, L. and Wang, P. R.: Weather and climate data from Greenland 1958–2010, Danish Meteorological Institute, Copenhagen, DMI Technical Report 11–15, 2011.; Box, J. E.: Greenland ice sheet mass balance reconstruction, Part II: Surface mass balance (1840–2010), J. Climate, 26, 6974–6989, 2013.; Csatho, B., Schenk, T., Van Der Veen, C. J., and Krabill, W. B.: Intermittent thinning of Jakobshavn Isbræ, West Greenland, since the Little Ice Age, J. Glaciol., 54, 131–144, 2008.; Chen, J. L., Wilson, C. R., and Tapley, B. D.: Interannual variability of Greenland ice losses from satellite gravimetry, J. Geophys. Res., 116, B07406, doi:10.1029/2010JB007789, 2011.; Enderlin, E. M., Howat, I. M., and Vieli, A.: High sensitivity of tidewater outlet glacier dynamics to shape, The Cryosphere, 7, 1007–1015, doi:10.5194/tc-7-1007-2013, 2013.; Howat, I. M., Joughin, I., and Scambos, T. A.: Rapid changes in ice discharge from Greenland outlet glaciers, Science, 315, 1559–1561, 2007.; Lowell, T. V.: As climate changes, so do glaciers, P. Natl. Acad. Sci. USA, 97, 1351–1354, 2000.; Ingleby, B. and Huddleston, M.: Quality control of ocean temperature and salinity profiles – historical and real-time data, J. Marine Syst., 65, 158–175, doi:10.1016/j.jmarsys.2005.11.019, 2007.; Jamieson, S. S. R., Vieli, A., Livingstone, S. J., Cofaigh, C., Stokes, C., Hillenbrand, C.-D., and Dowdeswell, J. A.: Ice-stream stability on a reverse bed slope, Nat. Geosci., 5, 799–802, 2012.; Jenkins, A., Nicholls, K. W., and Corr, H. F. J.: Observation and parameterization of ablation at the base of Ronne Ice Shelf, Antarctica, J. Phys. Oceanogr., 40, 2298–2311, 2010.; Joughin, I., Smith, B. E., Howat, I. M., Scambos, T., and Moon, T.: Greenland flow variability from ice-sheet-wide velocity mapping, J. Glaciol., 56, 415–430, 2010.; Khan, S. A., Wahr, J., Stearns, L. A., Hamilton, G. S., van Dam, T., Larson, K. M., and Francis, O.: Elastic uplift in southeast Greenland due to rapid ice mass loss, Geophys. Res. Lett., 34, L21701, doi:10.1029/2007GL031468, 2007.; Khan, S. A., Wahr, J., Bevis, M., Velicogna, I., and Kendrick, E.: Spread of ice mass loss into northwest Greenland observed by GRACE and GPS, Geophys. Res. Lett., 37, L06501, doi:10.1029/2010GL042460, 2010.; Khan, S. A., Kjær, K. H., Korsgaard, N. J., Wahr, J., Joughin, I. R., Timm, L. H., Bamber, J. L., van den Broeke, M. R., Stearns, L. A., Hamilton, G. S., Csatho, B. M., Nielsen, K., Hurkmans, R., and Babonis, G.: Recurring dynamically induced thinning during 1985 to 2010 on Upernavik Isstrøm, West Greenland, J. Geophys. Res.-Earth, 118, 111–121, doi:10.1029/2012JF002481

 

Click To View

Additional Books


  • The Length of the Glaciers in the World ... (by )
  • Melting Trends Over the Greenland Ice Sh... (by )
  • Net Accumulation Rates Derived from Ice ... (by )
  • Benchmark Experiments for Higher-order a... (by )
  • Utility of Late Summer Transient Snowlin... (by )
  • Theoretical Study of Solar Light Reflect... (by )
  • Constraining the Recent Mass Balance of ... (by )
  • Satellite Observations of Changes in Sno... (by )
  • Estimating Supraglacial Lake Depth in We... (by )
  • Committed Near-future Retreat of Smith, ... (by )
  • Cryogenic and Non-cryogenic Pool Calcite... (by )
  • Influence of the Tungurahua Eruption on ... (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.