DOI: 10.5194/tc-9-1415-2015
Scopus记录号: 2-s2.0-84938578486
论文题名: Numerical simulations and observations of the role of katabatic winds in the creation and maintenance of Scharffenbergbotnen blue ice area, Antarctica
作者: Zwinger T ; , Malm T ; , Schäfer M ; , Stenberg R ; , Moore J ; C
刊名: Cryosphere
ISSN: 19940416
出版年: 2015
卷: 9, 期: 4 起始页码: 1415
结束页码: 1426
语种: 英语
英文关键词: experimental study
; finite element method
; geometry
; ice cover
; ice field
; katabatic flow
; late glacial
; numerical model
; simulation
; spatial variation
; wind velocity
; Antarctica
; East Antarctica
; Scharffenbergbotnen Valley
英文摘要: We model the role of katabatic winds in the formation and maintenance of a blue ice area in Scharffenbergbotnen valley, Antarctica, using the finite element code Elmer. The high-horizontal-resolution (50-200 m) numerical simulations of the local wind flow from katabatic wind fronts show high spatial variability in wind-impact patterns and good congruence between places with high near-surface wind speeds and the blue ice area. In addition we perform wind simulations on an altered glacier geometry that resembles the thicker ice cover at the Late Glacial Maximum (LGM). These simulations indicate that the pronounced spatial wind-impact patterns depend on present-day geometry and did not occur during the LGM. This leads to the conclusion that the formation of the inner blue ice area of the Scharffenbergbotnen valley started only after the lowering of the ice surface, i.e. after the LGM. Experiments with smoothed surface topography suggest that detailed positions of the high wind regions, and hence individual blue ice fields, may have varied as the ice sheet lowered. The simulation results obtained with the present-day geometry were fortuitously confirmed by the destruction of a field camp located in a high-wind-speed area and its subsequent redistribution to low-velocity areas. The experiments and the field observations are consistent with localized violent katabatic events rather than synoptic-scale storms, playing the dominant role in the formation and maintenance of this and perhaps many blue ice areas. © Author(s) 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75271
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: CSC - IT Center for Science Ltd., P.O. Box 405, Espoo, Finland; College of Global Change and Earth System Science, Beijing Normal University, 19 Xinjiekou Wai Street, Beijing, China; Aalto University, Institute of Mathematics, P.O. Box 1100, Espoo, Finland; Arctic Centre, University of Lapland, P.O. Box 122, Rovaniemi, Finland
Recommended Citation:
Zwinger T,, Malm T,, Schäfer M,et al. Numerical simulations and observations of the role of katabatic winds in the creation and maintenance of Scharffenbergbotnen blue ice area, Antarctica[J]. Cryosphere,2015-01-01,9(4)