Evolution of supra-glacial lakes across the Greenland Ice Sheet

Sundal, A.V., Shepherd, A., Nienow, P. , Hanna, E., Palmer, S. and Huybrechts, P. (2009) Evolution of supra-glacial lakes across the Greenland Ice Sheet. Remote Sensing of Environment, 113 (10). pp. 2164-2171. ISSN 0034-4257

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We used 268 cloud-free Moderate-resolution Imaging Spectroradiometer (MODIS) images from 2003 and 2005-2007 to study the seasonal evolution of supra-glacial lakes in three different regions of the Greenland Ice Sheet. Lake area estimates were obtained by developing an automated classification method for their identification based on 250 m resolution MODIS surface reflectance observations. Widespread supra-glacial lake formation and drainage is observed across the ice sheet, with a 2-3 week delay in the evolution of total supra-glacial lake area in the northern areas compared to the south-west. The onset of lake growth varies by up to one month inter-annually, and lakes form and drain at progressively higher altitudes during the melt season. A positive correlation was found between the annual peak in total lake area and modelled annual runoff. High runoff and lake extent years are generally characterised by low accumulation and high melt season temperatures, and vice versa. Our results indicate that, in a future warmer climate Meehl, G. A., Stocker, T. F., Collins W. D., Friedlingstein, P., Gaye, A. T., Gregory, J. M., Kitoh, A., Knutti, R., Murphy, J. M., Noda, A., Raper, S. C. B., Watterson, I. G., Weaver, A. J. & Zhao, Z. C. (2007). Global Climate Projections. In: Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change Solomon, S., D. Qin, M. Manning, Z. Chen, M. Marquis, K. B. Averyt, M. Tignor & H. L. Miller (eds.), Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA., Greenland supra-glacial lakes can be expected to form at higher altitudes and over a longer time period than is presently the case, expanding the area and time period over which connections between the ice sheet surface and base may be established Das, S., Joughin, M., Behn, M., Howat, I., King, M., Lizarralde, D., & Bhatia, M. (2008). Fracture propagation to the base of the Greenland Ice Sheet during supra-glacial lake drainage. Science, 5877, 778-781 with potential consequences for ice sheet discharge Zwally, H.J., Abdalati, W., Herring, T., Larson, K., Saba, J. & Steffen, K. (2002). Surface melt-induced acceleration of Greenland Ice Sheet flow. Science, 297, 218-221.. © 2009 Elsevier Inc. All rights reserved.

Keywords:Annual runoff, Automated classification, Cambridge, Cambridge university, Collins, Fracture propagation, Glacial lakes, Global climate projections, Greenland, Greenland Ice Sheet, Ice sheet, Intergovernmental panel on climate changes, Lake areas, Moderate resolution imaging spectroradiometer, MODIS, New York, Physical science, Positive correlations, Season temperature, Supra-glacial lakes, Surface reflectance, Time periods, United kingdom, Working groups, Glacial geology, Glaciers, Ice, Image analysis, Image classification, Lakes, Runoff, Spectrometers, Climate change, glacial lake, identification method, landform evolution, melt, reflectance, Arctic, Greenland Ice Sheet, Clupeidae
Subjects:F Physical Sciences > F890 Geographical and Environmental Sciences not elsewhere classified
Divisions:College of Science > School of Geography
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ID Code:26045
Deposited On:06 Apr 2017 12:46

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