Greenland Ice Sheet surface mass balance 1870 to 2010 based on Twentieth Century Reanalysis, and links with global climate forcing

Hanna, E., Huybrechts, P., Cappelen, J. , Steffen, K., Bales, R. C., Burgess, E., McConnell, J. R., Steffensen, J. P., Van Den Broeke, M., Wake, L., Bigg, G., Griffiths, M. and Savas, D. (2011) Greenland Ice Sheet surface mass balance 1870 to 2010 based on Twentieth Century Reanalysis, and links with global climate forcing. Journal of Geophysical Research: Atmospheres, 116 (24). ISSN 2169-897x

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We present a reconstruction of the Greenland Ice Sheet surface mass balance (SMB) from 1870 to 2010, based on merged Twentieth Century Reanalysis (20CR) and European Centre for Medium-Range Weather Forecasts (ECMWF) meteorological reanalyses, and we compare our new SMB series with global and regional climate and atmospheric circulation indices during this period. We demonstrate good agreement between SMB annual series constructed from 20CR and ECMWF reanalyses for the common period of overlap and show statistically significant agreement of long-term modeled snowfall with ice-core-based accumulation data. We analyze variations in SMB for the last 140 years and highlight the periods with significantly increased runoff and decreased SMB since 1870, which have both been enhanced in the period since 1990, as well as interannual variations in SMB linked to Greenland climate fluctuations. We show very good agreement of our SMB series variations with existing, independently derived SMB series (RACMO2) variations for the past few decades of overlap but also a significant disparity of up to �200 km3 yr-1 in absolute SMB values due to poorly constrained modeled accumulation reflecting a lack of adequate validation data in southeast Greenland. There is no significant correlation between our SMB time series and a widely referenced time series of North Atlantic icebergs emanating from Greenland for the past century, which may reflect the complex nature of the relationship between SMB and ice dynamical changes. Finally, we discuss how our analysis sheds light on the sensitivity and response of the Greenland Ice Sheet to ongoing and future global climate change, and its contribution to global sea level rise. Copyright 2011 by the American Geophysical Union.

Keywords:Glacial geology, Glaciers, Sea ice, Sea level, Time series, Weather forecasting, Atmospheric circulation, Climate fluctuations, Complex nature, European Centre for Medium-Range Weather Forecasts, Global climate changes, Global climates, Global sea level rise, Greenland, Greenland Ice Sheet, Interannual variation, North Atlantic, Reanalysis, Regional climate, Southeast Greenland, Twentieth century, Validation data, Climate change, annual variation, atmospheric circulation, climate change, climate forcing, glacier mass balance, global climate, ice sheet, iceberg, reconstruction, runoff, sea level change, weather forecasting, Arctic
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:26039
Deposited On:22 Feb 2017 22:36

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