Journal cover Journal topic
The Cryosphere An interactive open-access journal of the European Geosciences Union
The Cryosphere, 10, 2361-2377, 2016
http://www.the-cryosphere.net/10/2361/2016/
doi:10.5194/tc-10-2361-2016
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
13 Oct 2016
A daily, 1 km resolution data set of downscaled Greenland ice sheet surface mass balance (1958–2015)
Brice Noël1, Willem Jan van de Berg1, Horst Machguth2,3,4, Stef Lhermitte5, Ian Howat6, Xavier Fettweis7, and Michiel R. van den Broeke1 1Institute for Marine and Atmospheric research Utrecht, Utrecht University, Utrecht, the Netherlands
2Department of Geography, University of Zurich, Zurich, Switzerland
3Department of Geosciences, University of Fribourg, Fribourg, Switzerland
4Geological Survey of Denmark and Greenland GEUS, Copenhagen, Denmark
5Department of Geoscience & Remote Sensing, Delft University of Technology, Delft, the Netherlands
6Byrd Polar Research Center and School of Earth Sciences, Ohio State University, Columbus, USA
7Department of Geography, University of Liège, Liège, Belgium
Abstract. This study presents a data set of daily, 1 km resolution Greenland ice sheet (GrIS) surface mass balance (SMB) covering the period 1958–2015. Applying corrections for elevation, bare ice albedo and accumulation bias, the high-resolution product is statistically downscaled from the native daily output of the polar regional climate model RACMO2.3 at 11 km. The data set includes all individual SMB components projected to a down-sampled version of the Greenland Ice Mapping Project (GIMP) digital elevation model and ice mask. The 1 km mask better resolves narrow ablation zones, valley glaciers, fjords and disconnected ice caps. Relative to the 11 km product, the more detailed representation of isolated glaciated areas leads to increased precipitation over the southeastern GrIS. In addition, the downscaled product shows a significant increase in runoff owing to better resolved low-lying marginal glaciated regions. The combined corrections for elevation and bare ice albedo markedly improve model agreement with a newly compiled data set of ablation measurements.

Citation: Noël, B., van de Berg, W. J., Machguth, H., Lhermitte, S., Howat, I., Fettweis, X., and van den Broeke, M. R.: A daily, 1 km resolution data set of downscaled Greenland ice sheet surface mass balance (1958–2015), The Cryosphere, 10, 2361-2377, doi:10.5194/tc-10-2361-2016, 2016.
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We present a 1 km resolution data set (1958–2015) of daily Greenland ice sheet surface mass balance (SMB), statistically downscaled from the data of RACMO2.3 at 11 km using elevation dependence, precipitation and bare ice albedo corrections. The data set resolves Greenland narrow ablation zones and local outlet glaciers, and shows more realistic SMB patterns, owing to enhanced runoff at the ice sheet margins. An evaluation of the product against SMB measurements shows improved agreement.
We present a 1 km resolution data set (1958–2015) of daily Greenland ice sheet surface mass...
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