A daily, 1 km resolution data set of downscaled Greenland ice sheet surface mass balance (1958–2015)

A daily, 1 km resolution data set of downscaled Greenland ice sheet surface mass balance (1958–2015)

Noël, Brice (Universiteit Utrecht)
van de Berg, Willem Jan (Universiteit Utrecht)
Machguth, Horst
Lhermitte, S.L.M. (TU Delft Mathematical Geodesy and Positioning)
Howat, Ian
Fettweis, Xavier
van den Broeke, Michiel R. (Universiteit Utrecht)

2016

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.

http://resolver.tudelft.nl/uuid:abe12d66-e733-4cdc-bcde-a293c04fe20f

https://doi.org/10.5194/tc-10-2361-2016

1994-0416

The Cryosphere, 10, 2361-2377

Institutional Repository

journal article

© 2016 Brice Noël, Willem Jan van de Berg, Horst Machguth, S.L.M. Lhermitte, Ian Howat, Xavier Fettweis, Michiel R. van den Broeke