DOI: 10.5194/tc-11-2213-2017
Scopus记录号: 2-s2.0-85029599946
论文题名: Regional modeling of the Shirase drainage basin, East Antarctica: Full Stokes vs. shallow ice dynamics
作者: Seddik H ; , Greve R ; , Zwinger T ; , Sugiyama S
刊名: Cryosphere
ISSN: 19940416
出版年: 2017
卷: 11, 期: 5 起始页码: 2213
结束页码: 2229
语种: 英语
英文关键词: drainage basin
; flow pattern
; glacier
; glacier flow
; ice flow
; ice sheet
; ice stream
; volume change
; Antarctica
; East Antarctica
; Shirase Glacier
英文摘要: A hierarchy of approximations of the force balance for the flow of grounded ice exists, ranging from the most sophisticated full Stokes (FS) formulation to the most simplified shallow ice approximation (SIA). Both are implemented in the ice flow model Elmer/Ice, and we compare them by applying the model to the East Antarctic Shirase drainage basin. First, we apply the control inverse method to infer the distribution of basal friction with FS. We then compare FS and SIA by simulating the flow of the drainage basin under present-day conditions and for three scenarios 100 years into the future defined by the SeaRISE (Sea-level Response to Ice Sheet Evolution) project. FS reproduces the observed flow pattern of the drainage basin well, in particular the zone of fast flow near the grounding line, while SIA generally overpredicts the surface velocities. As for the transient scenarios, the ice volume change (relative to the constant-climate control run) of the surface climate experiment is nearly the same for FS and SIA, while for the basal sliding experiment (halved basal friction), the ice volume change is ∼ 30% larger for SIA than for FS. This confirms findings of earlier studies that, in order to model ice sheet areas containing ice streams and outlet glaciers with high resolution and precision, careful consideration must be given to the choice of a suitable force balance. © of Author(s) 2017. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75500
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
There are no files associated with this item.
作者单位: Institute of Low Temperature Science, Hokkaido University, Kita-19, Nishi-8, Kita-ku, Sapporo, Japan; CSC-IT Center for Science, P.O. Box 405, Espoo, Finland
Recommended Citation:
Seddik H,, Greve R,, Zwinger T,et al. Regional modeling of the Shirase drainage basin, East Antarctica: Full Stokes vs. shallow ice dynamics[J]. Cryosphere,2017-01-01,11(5)