Modelling the Arctic wave-affected marginal ice zone: a comparison with ICESat-2 observations.

Modelling the Arctic wave-affected marginal ice zone: a comparison with ICESat-2 observations.
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DOI:
10.1098/rsta.2021.0262
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发表时间:
2022-10-31
影响因子:
5
通讯作者:
Brodeau, L.
Brodeau, L.
中科院分区:
综合性期刊2区
文献类型:
--
作者:
Boutin, G.;Williams, T.;Horvat, C.;Brodeau, L.
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我们在25公里分辨率的波冰耦合模型中评估了边缘冰区(MIZ)的范围,并与2018年12月至2020年5月期间ICESat-2测高得出的泛北极受波浪影响的海冰区域进行了比较。通过使用的MIZ的定义的基础上,每月最大的波高,我们建议的指标来评估模型考虑到稀疏覆盖ICESat-2。该模型产生的MIZ范围与观测结果相当,特别是在冬季。一项敏感性研究强调,需要在厚,致密的冰,但较弱的衰减海冰的形式,因为模型低估了MIZ的范围在秋季强波衰减。这种低估可能是由于在部分覆盖的冰,高估海冰浓度或影响浮冰大小的其他过程的情况下,有限的波浪增长。我们讨论了我们的研究结果的背景下,其他定义的MIZ的基础上浮冰的大小和海冰的浓度,以及潜在的影响,波浪引起的碎片冰动力学,发现在这里调查的气候尺度是轻微的。这篇文章是“边缘冰区动态的理论,建模和观测:多学科的观点和展望”主题问题的一部分。
We evaluate marginal ice zone (MIZ) extent in a wave–ice 25 km-resolution coupled model, compared with pan-Arctic wave-affected sea-ice regions derived from ICESat-2 altimetry over the period December 2018–May 2020. By using a definition of the MIZ based on the monthly maximum of the wave height, we suggest metrics to evaluate the model taking into account the sparse coverage of ICESat-2. The model produces MIZ extents comparable to observations, especially in winter. A sensitivity study highlights the need for strong wave attenuation in thick, compact ice but weaker attenuation as sea ice forms, as the model underestimates the MIZ extent in autumn. This underestimation may be due to limited wave growth in partially covered ice, overestimated sea-ice concentration or the absence of other processes affecting floe size. We discuss our results in the context of other definitions of the MIZ based on floe size and sea-ice concentration, as well as the potential impact of wave-induced fragmentation on ice dynamics, found to be minor at the climate scales investigated here. This article is part of the theme issue ‘Theory, modelling and observations of marginal ice zone dynamics: multidisciplinary perspectives and outlooks’.
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