A new present-day temperature parameterization for Greenland

Authors: Fausto, Robert S.; Ahlstrøm, Andreas P.; Van As, Dirk; Bøggild, Carl E.; Johnsen, Sigfus J.

Source: Journal of Glaciology, Volume 55, Number 189, February 2009 , pp. 95-105(11)

Publisher: International Glaciological Society

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Abstract:

Near-surface air temperature (2 m) over the Greenland ice sheet (GrIS) is parameterized using data from automatic weather stations located on land and on the ice sheet. The parameterization is expressed in terms of mean annual temperatures and mean July temperatures, both depending linearly on altitude, latitude and longitude. The temperature parameterization is compared to a previous study and is shown to be in better agreement with observations. The temperature parameterization is tested in a positive degree-day model to simulate the present (1996-2006) mean melt area extent of the GrIS. The model accounts for firn warming, rainfall and refreezing of meltwater, with different degree-day factors for ice and snow under warm and cold climate conditions. The simulated melt area extent is found to have reasonable agreement with satellite-derived observations.

Document Type: Research article

DOI: http://dx.doi.org/10.3189/002214309788608985

Publication date: 2009-02-01

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The Journal of Glaciology is published six times per year. It accepts submissions from any discipline related to the study of snow and ice. All articles are peer reviewed. The Journal is included in the ISI Science Citation Index.
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