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《科学》 2026年10月15日 · 中文解读

冰崖崩解的经验约束

Empirical constraints on ice cliff calving · C. Needell et al.
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这篇讲什么
研究人员利用激光测高数据测量了南极洲和格陵兰岛冰盖边缘的15330处冰崖,发现冰崖高度与冰水混合物厚度、水深和裂隙发育程度高度相关。高冰崖的崩解速度比现有参数化模型假设的更快,但动态减薄和冰厚梯度较低会阻止失控退缩。这意味着未来海平面上升的模型预测可能低估了冰崖崩解的速率,而冰盖不稳定性并不只取决于冰崖高度。
原文开头
Caroline Needell1*, Catherine C. Walker2, Jeremy N. Bassis3 When calving cliffs at the margins of earth’s ice sheets exceed a critical height, runaway retreat may be initiated in a process called the marine ice cliff instability. However, sufficiently tall ice cliffs have rarely been observed. to address this gap, we measured the characteristics of 15,330 ice cliffs across earth’s ice sheet margins using laser altimetry. We show that cliff height is highly correlated with mélange thickness, water depth, and crevassing. We found that tall cliffs calve more rapidly than parameterizations assume, but dynamic thinning and retreat into regions with low ice thickness gradients prevent runaway retreat. …
摘自《科学》(Science)2026年10月15日,C. Needell et al.。仅引用开头一小段供了解文章,版权归原刊所有,全文请阅读原刊。
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