DOI: 10.5194/tc-14-2053-2020
论文题名: Spectral attenuation of ocean waves in pack ice and its application in calibrating viscoelastic wave-in-ice models
作者: Cheng S. ; Stopa J. ; Ardhuin F. ; Shen H.H.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期: 6 起始页码: 2053
结束页码: 2069
语种: 英语
英文关键词: marginal ice zone
; ocean wave
; pack ice
; Sentinel
; shear modulus
; synthetic aperture radar
; viscoelasticity
; viscosity
; wave attenuation
; wave spectrum
; Arctic Ocean
; Beaufort Sea
英文摘要: We investigate a case of ocean waves through a pack ice cover captured by Sentinel-1A synthetic aperture radar (SAR) on 12 October 2015 in the Beaufort Sea. The study domain is 400 km by 300 km, adjacent to a marginal ice zone (MIZ). The wave spectra in this domain were reported in a previous study (Stopa et al., 2018b). In that study, the authors divided the domain into two regions delineated by the first appearance of leads (FAL) and reported a clear change of wave attenuation of the total energy between the two regions. In the present study, we use the same dataset to study the spectral attenuation in the domain. According to the quality of SAR-retrieved wave spectrum, we focus on a range of wave numbers corresponding to 9-15 s waves from the open-water dispersion relation. We first determine the apparent attenuation rates of each wave number by pairing the wave spectra from different locations. These attenuation rates slightly increase with increasing wave number before the FAL and become lower and more uniform against wave number in thicker ice after the FAL. The spectral attenuation due to the ice effect is then extracted from the measured apparent attenuation and used to calibrate two viscoelastic wave-in-ice models. For the Wang and Shen (2010b) model, the calibrated equivalent shear modulus and viscosity of the pack ice are roughly 1 order of magnitude greater than that in grease and pancake ice reported in Cheng et al. (2017). These parameters obtained for the extended Fox and Squire model are much greater, as found in Mosig et al. (2015) using data from the Antarctic MIZ. This study shows a promising way of using remote-sensing data with large spatial coverage to conduct model calibration for various types of ice cover. © 2020 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164427
Appears in Collections: 气候变化与战略
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作者单位: Nansen Environmental and Remote Sensing Center, Bergen, Norway; Department of Ocean and Resources Engineering, University of Hawaii, Manoa, HI, United States; Univ. Brest, CNRS, IRD, Ifremer, Laboratoire d'Océanographie Physique et Spatiale (LOPS), IUEM, Brest, France; Department of Civil and Environmental Engineering, Clarkson University, Potsdam, NY, United States
Recommended Citation:
Cheng S.,Stopa J.,Ardhuin F.,et al. Spectral attenuation of ocean waves in pack ice and its application in calibrating viscoelastic wave-in-ice models[J]. Cryosphere,2020-01-01,14(6)