DOI: 10.5194/tc-14-3367-2020
论文题名: Impact of coastal East Antarctic ice rises on surface mass balance: Insights from observations and modeling
作者: Kausch T. ; Lhermitte S. ; Lenaerts J.T.M. ; Wever N. ; Inoue M. ; Pattyn F. ; Sun S. ; Wauthy S. ; Tison J.-L. ; van de Berg W.J.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期: 10 起始页码: 3367
结束页码: 3380
语种: 英语
英文关键词: climate modeling
; damping
; deep drilling
; glacial erosion
; ground penetrating radar
; ice core
; ice flow
; mass balance
; sea ice
; snow accumulation
; wind erosion
; Antarctica
; East Antarctica
; Queen Maud Land
英文摘要: About 20 % of all snow accumulation in Antarctica occurs on the ice shelves. There, ice rises control the spatial surface mass balance (SMB) distribution by inducing snowfall variability and wind erosion due to their topography. Moreover these ice rises buttress the ice flow and represent ideal drilling locations for ice cores. In this study we assess the connection between snowfall variability and wind erosion to provide a better understanding of how ice rises impact SMB variability, how well this is captured in the regional atmospheric climate model RACMO2 and the implications of this SMB variability for ice rises as an ice core drilling site. By combining ground-penetrating radar (GPR) profiles from two ice rises in Dronning Maud Land with ice core dating, we reconstruct spatial and temporal SMB variations from 1983 to 2018 and compare the observed SMB with output from RACMO2 and SnowModel. Our results show snowfall-driven differences of up to 1.5 times higher SMB on the windward side of both ice rises than on the leeward side as well as a local erosion-driven minimum at the ice divide of the ice rises. RACMO2 captures the snowfall-driven differences but overestimates their magnitude, whereas the erosion on the peak can be reproduced by SnowModel with RACMO2 forcing. Observed temporal variability of the average SMBs, retrieved from the GPR data for four time intervals in the 1983-2018 range, are low at the peak of the easternmost ice rise (∼ 0.06 m w.e. yr−1), while they are higher (∼ 0.09 m w.e. yr−1) on the windward side of the ice rise. This implies that at the peak of the ice rise, higher snowfall, driven by orographic uplift, is balanced out by local erosion. As a consequence of this, the SMB recovered from the ice core matches the SMB from the GPR at the peak of the ice rise but not at the windward side of the ice rise, suggesting that the SMB signal is damped in the ice core. © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164502
Appears in Collections: 气候变化与战略
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作者单位: Department of Geoscience and Remote Sensing, Delft University of Technology, Mekelweg 5, Delft, 2628 CD, Netherlands; Department of Atmospheric and Oceanic Sciences, University of Colorado Boulder, 4001 Discovery Dr., Boulder, CO 80309, United States; Laboratoire de Glaciologie, Université Libre de Bruxelles, Avenue F.D. Roosevelt 50, Bruxelles, 1050, Belgium; Institute for Marine and Atmospheric Research Utrecht, Utrecht University, Princetonplein 5, Utrecht, 3584 CC, Netherlands
Recommended Citation:
Kausch T.,Lhermitte S.,Lenaerts J.T.M.,et al. Impact of coastal East Antarctic ice rises on surface mass balance: Insights from observations and modeling[J]. Cryosphere,2020-01-01,14(10)