Calibrating a Viscoelastic Sea Ice Model for Wave Propagation in the Arctic Fall Marginal Ice Zone
Calibrating a Viscoelastic Sea Ice Model for Wave Propagation in the Arctic Fall Marginal Ice Zone
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DOI：
10.1002/2017jc013275
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发表时间：
2017-11-01
影响因子：
3.6
通讯作者：
Shen, Hayley H.
中科院分区：
文献类型：
--
作者：
Cheng, Sukun;Rogers, W. Erick;Shen, Hayley H.
本文介绍了冰中波模型的标定研究。使用的数据是在2015年北冰洋西部秋季边缘冰带推进的薄冰中收集的，在那里发现煎饼冰普遍存在。在七个波浪实验中部署了多个浮标；本研究使用了其中四个实验的数据。波浪衰减系数是利用两个浮标之间的波能衰减来计算的。在其中一个实验中测量了波数。强迫参数是通过同时进行的原位和遥感观测以及预报/后推模式获得的。利用三个波浪实验的实例，对冰层中波浪衰减/色散的粘弹性模型进行了校正。采用多目标遗传算法，通过最小化模型和测量的复波数之间的差异来完成校准。用两种方法对标定结果进行了验证。一种方法是将标定后的粘弹性参数直接应用于标定过程中未使用的一个波浪实验，然后将模型得到的衰减与实测数据进行比较。另一种方法是使用WAVEWATCH III (R)中校准的整个西波弗特海的粘弹性模型，然后比较两个未用于校准的远程站点的波浪谱。两次验证均表明模型与实测数据吻合较好。完整的粘弹性模型适用于以煎饼冰为主的落缘冰带。
This paper presents a wave-in-ice model calibration study. Data used were collected in the thin ice of the advancing autumn marginal ice zone of the western Arctic Ocean in 2015, where pancake ice was found to be prevalent. Multiple buoys were deployed in seven wave experiments; data from four of these experiments are used in the present study. Wave attenuation coefficients are calculated utilizing wave energy decay between two buoys measuring simultaneously within the ice covered region. Wavenumbers are measured in one of these experiments. Forcing parameters are obtained from simultaneous in-situ and remote sensing observations, as well as forecast/hindcast models. Cases from three wave experiments are used to calibrate a viscoelastic model for wave attenuation/dispersion in ice cover. The calibration is done by minimizing the difference between modeled and measured complex wavenumber, using a multi-objective genetic algorithm. The calibrated results are validated using two methods. One is to directly apply the calibrated viscoelastic parameters to one of the wave experiments not used in the calibration and then compare the attenuation from the model with measured data. The other is to use the calibrated viscoelastic model in WAVEWATCH III (R) over the entire western Beaufort Sea and then compare the wave spectra at two remote sites not used in the calibration. Both validations show reasonable agreement between the model and the measured data. The completed viscoelastic model is believed to be applicable to the fall marginal ice zone dominated by pancake ice.