DOI: 10.5194/tc-8-575-2014
Scopus记录号: 2-s2.0-84898047311
论文题名: Vital role of daily temperature variability in surface mass balance parameterizations of the Greenland ice sheet
作者: Rogozhina I ; , Rau D
刊名: Cryosphere
ISSN: 19940416
出版年: 2014
卷: 8, 期: 2 起始页码: 575
结束页码: 585
语种: 英语
英文关键词: 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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74868
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Section 1.3: Earth System Modelling, Telegrafenberg A20, 14473 Potsdam, Germany
Recommended Citation:
Rogozhina I,, Rau D. Vital role of daily temperature variability in surface mass balance parameterizations of the Greenland ice sheet[J]. Cryosphere,2014-01-01,8(2)