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DOI	10.5194/tc-8-575-2014
	Vital role of daily temperature variability in surface mass balance parameterizations of the Greenland ice sheet
	Rogozhina I.; Rau D.
发表日期	2014
ISSN	19940416
卷号	8 期号:2
英文摘要	This study aims to demonstrate that the spatial and seasonal effects of daily temperature variability in positive degree-day (PDD) models play a decisive role in shaping the modeled surface mass balance (SMB) of continental-scale ice masses. Here we derive monthly fields of daily temperature standard deviation (SD) across Greenland from the ERA-40 (European Centre for Medium-Range Weather Forecasts 40 yr Reanalysis) reanalysis spanning from 1958 to 2001 and apply these fields to model recent surface responses of the Greenland Ice Sheet (GIS). Neither the climate data set analyzed nor in situ measurements taken in Greenland support the range of commonly used spatially and temporally uniform SD values (∼ 5 °C). In this region, the SD distribution is highly inhomogeneous and characterized by low values during summer months (∼ 1 to 2.5 °C) in areas where most surface melting occurs. As a result, existing SMB parameterizations using uniform, high SD values fail to capture both the spatial pattern and amplitude of the observed surface responses of the GIS. Using realistic SD values enables significant improvements in the modeled regional and total SMB with respect to existing estimates from recent satellite observations and the results of a high-resolution regional model. In addition, this resolves large uncertainties associated with other major parameters of a PDD model, namely degree-day factors. The model appears to be nearly insensitive to the choice of degree-day factors after adopting the realistic SD distribution. © Author(s) 2014. CC Attribution 3.0 License.
学科领域	climate modeling; cryosphere; data set; diurnal variation; GIS; ice sheet; mass balance; parameterization; satellite imagery; spatiotemporal analysis; temperature gradient; weather forecasting; Arctic; Greenland; Greenland Ice Sheet
语种	英语
scopus关键词	climate modeling; cryosphere; data set; diurnal variation; GIS; ice sheet; mass balance; parameterization; satellite imagery; spatiotemporal analysis; temperature gradient; weather forecasting; Arctic; Greenland; Greenland Ice Sheet
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/120133
作者单位	Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Section 1.3: Earth System Modelling, Telegrafenberg A20, 14473 Potsdam, Germany
推荐引用方式 GB/T 7714	Rogozhina I.,Rau D.. Vital role of daily temperature variability in surface mass balance parameterizations of the Greenland ice sheet[J],2014,8(2).
APA	Rogozhina I.,&Rau D..(2014).Vital role of daily temperature variability in surface mass balance parameterizations of the Greenland ice sheet.Cryosphere,8(2).
MLA	Rogozhina I.,et al."Vital role of daily temperature variability in surface mass balance parameterizations of the Greenland ice sheet".Cryosphere 8.2(2014).