Empirical constraints on ice cliff calving · C. Needell et al.
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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。