Journal cover Journal topic
The Cryosphere An interactive open-access journal of the European Geosciences Union
The Cryosphere, 6, 891-899, 2012
http://www.the-cryosphere.net/6/891/2012/
doi:10.5194/tc-6-891-2012
© Author(s) 2012. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
15 Aug 2012
Drifting snow climate of the Greenland ice sheet: a study with a regional climate model
J. T. M. Lenaerts1, M. R. van den Broeke1, J. H. van Angelen1, E. van Meijgaard2, and S. J. Déry3 1Institute for Marine and Atmospheric research Utrecht, Utrecht University, Utrecht, The Netherlands
2Royal Netherlands Meteorological Institute, De Bilt, The Netherlands
3University of Northern British Columbia, Prince George, Canada
Abstract. This paper presents the drifting snow climate of the Greenland ice sheet, using output from a high-resolution (∼11 km) regional climate model. Because reliable direct observations of drifting snow do not exist, we evaluate the modeled near-surface climate instead, using automatic weather station (AWS) observations from the K-transect and find that RACMO2 realistically simulates near-surface wind speed and relative humidity, two variables that are important for drifting snow. Integrated over the ice sheet, drifting snow sublimation (SUds) equals 24 ± 3 Gt yr−1, and is significantly larger than surface sublimation (SUs, 16 ± 2 Gt yr−1). SUds strongly varies between seasons, and is only important in winter, when surface sublimation and runoff are small. A rapid transition exists between the winter season, when snowfall and SUds are important, and the summer season, when snowmelt is significant, which increases surface snow density and thereby limits drifting snow processes. Drifting snow erosion (ERds) is only important on a regional scale. In recent decades, following decreasing wind speed and rising near-surface temperatures, SUds exhibits a negative trend (0.1 ± 0.1 Gt yr−1), which is compensated by an increase in SUs of similar magnitude.

Citation: Lenaerts, J. T. M., van den Broeke, M. R., van Angelen, J. H., van Meijgaard, E., and Déry, S. J.: Drifting snow climate of the Greenland ice sheet: a study with a regional climate model, The Cryosphere, 6, 891-899, doi:10.5194/tc-6-891-2012, 2012.
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