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Greenland ice sheet mass balance reconstruction. Part I: net snow accumulation (1600-2009)
Faculty of Engineering and Information Sciences - Papers
  • Jason E Box, Ohio State University
  • Noel Cressie, University of Wollongong
  • David H Bromwich, Ohio State University
  • Ji-Hoon Jung, Ohio State University
  • Michiel Van Den Broeke, Utrecht University, Heidelberglaan, The Netherland
  • J H Van Angelen, Utrecht University, Heidelberglaan, The Netherland
  • Richard R Forster, University of Utah
  • Clement Miege, University of Utah
  • Ellen Mosley-Thompson, Ohio State University
  • Bo Vinther, Niels Bohr Institute, Copenhagen
  • Joseph R McConnell, Desert Research Institute
RIS ID
74588
Publication Date
1-1-2013
Publication Details

Box, J. E., Cressie, N., Bromwich, D. H., Jung, J., Van Den Broeke, M., Van Angelen, J. H., Forster, R. R., Miege, C., Mosley-Thompson, E., Vinther, B. & McConnell, J. R. (2013). Greenland ice sheet mass balance reconstruction. Part I: net snow accumulation (1600-2009). Journal of Climate, 26 (11), 3919-3934.

Abstract

Ice core data are combined with RACMO2 regional climate model (RCM) output (1958-2010) to develop a reconstruction of the Greenland ice sheet net snow accumulation rate (Ât(G)) spanning years 1600-2009. Regression parameters from RCM output regressed on 86 ice cores are used with available cores in a given year resulting in the reconstructed values. Each core site’s residual variance is used to inversely weight the cores’ respective contributions. The interannual amplitude of the reconstructed accumulation rate is damped by the regressions and is thus calibrated to match that of the RCM data. Uncertainty and significance of changes is measured using statistical models. We find a 12% or 86 Gt y-1 increase in ice sheet accumulation rate from the end of the Little Ice Age in ~1840 to the last decade of the reconstruction. This 1840-1996 trend is 30% higher than that of 1600-2009, suggesting an accelerating accumulation rate. The correlation of Ât(G) with the average surface air temperature in the Northern Hemisphere(SATNHt) remains positive through time, while the correlation of Ât(G) with local near-surface air temperatures or North Atlantic sea surface temperatures is inconsistent, suggesting a hemispheric-scale climate connection. We find an annual sensitivity of Ât(G) to SATNHt of 6.8% K-1 or 51 Gt K-1. The reconstuction, Ât(G), correlates consistently highly with the North Atlantic Oscillation index. Yet, at the 11-year time scale, the sign of this correlation flips four times in the 1870-2005 period.

Citation Information
Jason E Box, Noel Cressie, David H Bromwich, Ji-Hoon Jung, et al.. "Greenland ice sheet mass balance reconstruction. Part I: net snow accumulation (1600-2009)" (2013)
Available at: http://works.bepress.com/noel_cressie/311/