Multi-scale satellite observations of Arctic sea ice: new insight into the life cycle of the floe size distribution.
Multi-scale satellite observations of Arctic sea ice: new insight into the life cycle of the floe size distribution.
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DOI：
10.1098/rsta.2021.0259
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发表时间：
2022-10-31
期刊：
影响因子：
5
通讯作者：
Wang, Yanan
中科院分区：
文献类型：
--
作者：
Hwang, Byongjun;Wang, Yanan
该研究为理解北极海冰浮冰大小分布的生命周期及其相关过程提供了一个新的概念框架。我们从从北极不同地点和时间获得的多尺度卫星图像数据中得出了浮冰的大小分布。我们的研究确定了夏季浮冰大小演变的三个阶段——“破裂”、“过渡”和“融化/波浪破碎”。压裂定义了由弹簧破碎形成的初始粒径分布（N ~ d−α，其中d为粒径），在d = 30-3000 m范围内具有单一幂律特征，α 2。在过渡时期，不同的破碎过程改变了初始粒径分布，其特征是大粒径（d > ~ 300 m）的“选择性”破碎，α值随破碎程度的不同而变化= 2.5 ~ 3.5。随着融冰的加剧，融冰破碎扩展为单个幂律区，形成较小的融冰体（d = 70 m）， α = 2.4 ~ 3.8，而较小的融冰体（d < 30 ~ 40 m）由于侧向融冰而显著减少。形状因子显示了从长形絮凝体到圆形絮凝体的整体进展。讨论了结垢和波浪破裂的影响。本文是“边缘冰带动力学的理论、建模和观测：多学科观点和展望”主题问题的一部分。
This study provides a new conceptional framework to understand the life cycle of the floe size distribution of Arctic sea ice and the associated processes. We derived the floe size distribution from selected multi-scale satellite imagery data acquired from different locations and times in the Arctic. Our study identifies three stages of the floe size evolution during summer – ‘fracturing’, ‘transition’ and ‘melt/wave fragmentation’. Fracturing defines the initial floe size distribution (N ∼ d−α, where d is floe size) formed from the spring breakup, characterized by the single power-law regime over d = 30–3000 m with α 2. The initial floe size distribution is then modified by various floe fragmentation processes during the transition period, which is characterized by ‘selective’ fragmentation of large floes (d > 200–300 m) with variable α = 2.5–3.5 depending on the degree of fragmentation. As ice melt intensifies, the melt fragmentation expands the single power-law regime into smaller floes (d = 70 m) with α = 2.4–3.8, while a significant reduction of small floes (d < 30–40 m) occurs due to lateral melt. The shape factor shows an overall progression from elongated floes into rounded floes. The effects of scaling and wave-fracture are also discussed. 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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