DOI: 10.1002/2017JC013627
Scopus记录号: 2-s2.0-85042398473
论文题名: An Examination of the Sea Ice Rheology for Seasonal Ice Zones Based on Ice Drift and Thickness Observations
作者: Toyota T. ; Kimura N.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 2 起始页码: 1406
结束页码: 1428
语种: 英语
英文关键词: ice rheology
; SAR-derived ice thickness
; sea ice drift
; sea ice dynamics
; Sea of Okhotsk
; seasonal sea ice
Scopus关键词: AMSR-E
; backscatter
; brightness temperature
; deformation
; ice cover
; ice drift
; ice thickness
; PALSAR
; radar
; rheology
; sea ice
; seasonal variation
; spacing
; spatial resolution
; Arctic Ocean
; Pacific Ocean
; Sea of Okhotsk
英文摘要: The validity of the sea ice rheological model formulated by Hibler (1979), which is widely used in present numerical sea ice models, is examined for the Sea of Okhotsk as an example of the seasonal ice zone (SIZ), based on satellite-derived sea ice velocity, concentration and thickness. Our focus was the formulation of the yield curve, the shape of which can be estimated from ice drift pattern based on the energy equation of deformation, while the strength of the ice cover that determines its magnitude was evaluated using ice concentration and thickness data. Ice drift was obtained with a grid spacing of 37.5 km from the AMSR-E 89 GHz brightness temperature using a maximum cross-correlation method. The ice thickness was obtained with a spatial resolution of 100 m from a regression of the PALSAR backscatter coefficients with ice thickness. To assess scale dependence, the ice drift data derived from a coastal radar covering a 70 km range in the southernmost Sea of Okhotsk were similarly analyzed. The results obtained were mostly consistent with Hibler's formulation that was based on the Arctic Ocean on both scales with no dependence on a time scale, and justify the treatment of sea ice as a plastic material, with an elliptical shaped yield curve to some extent. However, it also highlights the difficulty in parameterizing sub-grid scale ridging in the model because grid scale ice velocities reduce the deformation magnitude by half due to the large variation of the deformation field in the SIZ. © 2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114584
Appears in Collections: 气候减缓与适应
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作者单位: Institute of Low Temperature Science, Hokkaido University, Sapporo, Japan; Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Japan
Recommended Citation:
Toyota T.,Kimura N.. An Examination of the Sea Ice Rheology for Seasonal Ice Zones Based on Ice Drift and Thickness Observations[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(2)