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Preprints
https://doi.org/10.5194/essd-2020-47
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/essd-2020-47
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  07 Apr 2020

07 Apr 2020

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A revised version of this preprint is currently under review for the journal ESSD.

Greenland liquid water runoff from 1979 through 2017

Kenneth D. Mankoff1, Andreas P. Ahlstrøm1, William Colgan1, Robert S. Fausto1, Xavier Fettweis2, Ken Kondo3, Kirsty Langley4, Brice Noël5, Shin Sugiyama3, and Dirk van As1 Kenneth D. Mankoff et al.
  • 1Department of Glaciology and Climate, Geological Survey of Denmark and Greenland (GEUS), Copenhagen, Denmark
  • 2Department of Geography, University of Liège, Belgium
  • 3Institute of Low Temperature Science, Hokkaido University, Japan
  • 4Asiaq-Greenland Survey, Nuuk, Greenland
  • 5Institute for Marine and Atmospheric Research, Utrecht University, the Netherlands

Abstract. We provide high-resolution datasets of Greenland hydrologic outlets, basins, and streams, and a 1979 through 2017 time series of Greenland liquid water runoff for each outlet. Outlets, basins, and streams are derived from traditional hydrologic routing algorithms over the surface of a 100 m ArcticDEM digital elevation model (DEM) twice: Once to the ice margin and once to the coast. We then partition liquid water runoff from both ice and land from two regional climate models (RCMs; MAR and RACMO) into each basin and at each outlet location. The data include 18903 ice basins and outlets (614 basins greater than 10 km2), 30241 land basins and outlets (958 basins greater than 10 km2), major streams in each basin, and daily runoff water volume flow rate at each outlet from each of two RCMs. We perform a sensitivity study of outlet location change for every ice sheet location over a range of hydrologic routing assumptions and data sets. Annual runoff from the ice ranges from ~136 km3 in 1992 to ~785 km3 in 2012. Daily maximum ice runoff from one basin is as large as 4380 m3 s−1. Both ice runoff magnitude and variability increase over the time series. Land runoff contributes an additional ∼ 35 % to the ice runoff. Comparison with 9 basins instrumented with stream gauges shows a range of (dis)agreement from poor to excellent between our estimated discharge and observations. As part of the journal’s living archive option, and our goal to make an operational product, all input data, code, and results from this study will be updated as needed (when new input data are available, as new features are added, or to fix bugs) and made available at https://doi.org/10.22008/promice/data/freshwater_runoff/v01 (Mankoff, 2020) and at http://github.com/mankoff/freshwater.

Kenneth D. Mankoff et al.

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Kenneth D. Mankoff et al.

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Greenland liquid water runoff from 1979 through 2017 K. D. Mankoff https://doi.org/10.22008/promice/data/freshwater_runoff/v01

Kenneth D. Mankoff et al.

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Short summary
This work partitions daily regional climate model (RCM) runoff, from 1979 through 2017, from Greenland to hydrologic outlets at the ice sheet margin or the coast. Runoff increases in magnitude and variability over the time series. This project was done to support oceanographic research needs.
This work partitions daily regional climate model (RCM) runoff, from 1979 through 2017, from...
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