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Discussion papers
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 21 Feb 2019

Research article | 21 Feb 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Earth System Science Data (ESSD).

Greenland Ice Sheet discharge from 2000 to 2018

Kenneth D. Mankoff1, William Colgan1, Anne Solgaard1, Nanna B. Karlsson1, Andreas P. Ahlstrøm1, Dirk van As1, Jason E. Box1, Shfaqat Abbas Khan2, Kristian K. Kjeldsen1, Jeremie Mouginot3, and Robert S. Fausto1 Kenneth D. Mankoff et al.
  • 1Department of Glaciology and Climate, Geological Survey of Denmark and Greenland (GEUS), Copenhagen, Denmark
  • 2DTU Space, National Space Institute, Department of Geodesy, Technical University of Denmark, Kgs. Lyngby, Denmark
  • 3Department of Earth System Science, University of California, Irvine, CA, USA

Abstract. We present a new 18-year (2000 to 2018) estimate of Greenland Ice Sheet ice discharge. Our data include all ice that flows faster than 100 m yr−1 and are generated through an automatic and adaptable method, as opposed to conventional hand-picked gates. We position gates near the present-year termini and estimate problematic bed topography (ice thickness) values where necessary. In addition to using annual time-varying ice thickness, our time series uses velocity maps that begin with monthly estimates and sparse spatial coverage and ends with ~6-day estimates and near-complete spatial coverage. The recent average (2010 to 2017) ice discharge through the flux-gates is ~500 ± 50 Gt yr−1. The 10 % uncertainty stems from uncertain ice bed location (ice thickness). We attribute the ~50 Gt yr−1 differences among our results and previous studies to our use of updated bed topography from BedMachine v3. Discharge increases from 2000 to 2005, then appears approximately steady. However, regional variability is more pronounced, with decreases at all major discharging glaciers and in all but one 10 sector offset by increases in the NW sector. As part of the journal’s living archive option, all input data, code, and results from this study will be updated when new input data are accessible and made freely available at doi:10.22008/promice/data/ice_discharge.

Kenneth D. Mankoff et al.
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Kenneth D. Mankoff et al.
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