A new present-day temperature parameterization for Greenland

被引：81

作者：

Fausto, Robert S. ^{[1
,2
]}

Ahlstrom, Andreas P. ^{[1
]}

Van As, Dirk ^{[1
]}

Boggild, Carl E. ^{[1
,3
]}

Johnsen, Sigfus J. ^{[2
]}

机构：

[1] GEUS, Geol Survey Denmark & Greenland, DK-1350 Copenhagen, Denmark

[2] Univ Copenhagen, Niels Bohr Inst, CIC, DK-2100 Copenhagen, Denmark

[3] Univ Ctr Svalbard UNIS, NO-9171 Longyearbyen, Norway

来源：

JOURNAL OF GLACIOLOGY | 2009年 / 55卷 / 189期

关键词：

REGIONAL CLIMATE MODEL; ICE-SHEET; ABLATION;

D O I：

10.3189/002214309788608985

中图分类号：

P9 [自然地理学];

学科分类号：

0705 ; 070501 ;

摘要：

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.

引用

页码：95 / 105

页数：11

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