DOI: 10.5194/tc-7-333-2013
Scopus记录号: 2-s2.0-84874464166
论文题名: Event-driven deposition of snow on the Antarctic Plateau: Analyzing field measurements with SNOWPACK
作者: Groot Zwaaftink C ; D ; , Cagnati A ; , Crepaz A ; , Fierz C ; , MacElloni G ; , Valt M ; , Lehning M
刊名: Cryosphere
ISSN: 19940416
出版年: 2013
卷: 7, 期: 1 起始页码: 333
结束页码: 347
语种: 英语
英文关键词: cryosphere
; data set
; field method
; height determination
; parameterization
; snow accumulation
; snow cover
; snowpack
; weather station
; Antarctica
; Dome Concordia
; East Antarctica
英文摘要: Antarctic surface snow has been studied by means of continuous measurements and observations over a period of 3 yr at Dome C. Snow observations include solid deposits in form of precipitation, diamond dust, or hoar, snow temperatures at several depths, records of deposition and erosion on the surface, and snow profiles. Together with meteorological data from automatic weather stations, this forms a unique dataset of snow conditions on the Antarctic Plateau. Large differences in snow amounts and density exist between solid deposits measured 1 m above the surface and deposition at the surface. We used the snow-cover model SNOWPACK to simulate the snow-cover evolution for different deposition parameterizations. The main adaptation of the model described here is a new event-driven deposition scheme. The scheme assumes that snow is added to the snow cover permanently only during periods of strong winds. This assumption followed from the comparison between observations of solid deposits and daily records of changes in snow height: solid deposits could be observed on tables 1 m above the surface on 94 out of 235 days (40%) while deposition at the surface occurred on 59 days (25%) during the same period, but both happened concurrently on 33 days (14%) only. This confirms that precipitation is not necessarily the driving force behind non-temporary snow height changes. A comparison of simulated snow height to stake farm measurements over 3 yr showed that we underestimate the total accumulation by at least 33%, when the total snow deposition is constrained by the measurements of solid deposits on tables 1 m above the surface. During shorter time periods, however, we may miss over 50% of the deposited mass. This suggests that the solid deposits measured above the surface and used to drive the model, even though comparable to ECMWF forecasts in its total magnitude, should be seen as a lower boundary. As a result of the new deposition mechanism, we found a good agreement between model results and measurements of snow temperatures and recorded snow profiles. In spite of the underestimated deposition, the results thus suggest that we can obtain quite realistic simulations of the Antarctic snow cover by the introduction of event-driven snow deposition. © 2013 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74989
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: WSL, Institute for Snow and Avalanche Research SLF, Davos, Switzerland; ARPAV CVA, Arabba di Livinallongo, Italy; Institute of Applied Physics-IFAC-CNR, Florence, Italy; CRYOS, School of Architecture, Civil and Environmental Engineering, EPFL, Lausanne, Switzerland
Recommended Citation:
Groot Zwaaftink C,D,, Cagnati A,et al. Event-driven deposition of snow on the Antarctic Plateau: Analyzing field measurements with SNOWPACK[J]. Cryosphere,2013-01-01,7(1)