Yan Yang, Zhongwen Zhan, Martin Karrenbach, Auden Reid-McLaughlin, Ettore Biondi, Douglas A. Wiens, Richard C. Aster
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引用次数: 0
摘要
桦皮层覆盖了南极洲 98% 的冰原,保护底层冰川不受外部环境的影响。要评估冰冻圈的质量平衡和气候变化影响,就必须精确测量枞树层的特性。通过岩芯取样来确定杉层结构的特征不仅成本高昂,而且在物流方面也极具挑战性。地震勘测可将地震速度转化为枞树密度,是一种高效的替代方法。这项研究采用分布式声学传感技术,将南极附近的一条现有光缆改造成一个多通道、低维护、连续询问的地震阵列。数据解析了频率高达 100 Hz 的 16 种地震波传播模式,从而确定了 P 波和 S 波速度与深度的函数关系。利用同位检波器进行环境噪声干涉测量,我们分辨出了非常微弱的径向各向异性。利用附近的 SPICEcore 冷杉密度数据,我们发现先前的经验密度-速度关系低估了 15%以上的冷杉空气含量。我们为南极地区提出了一种新的经验关系。
Characterizing South Pole Firn Structure With Fiber Optic Sensing
The firn layer covers 98% of Antarctica's ice sheets, protecting underlying glacial ice from the external environment. Accurate measurement of firn properties is essential for assessing cryosphere mass balance and climate change impacts. Characterizing firn structure through core sampling is expensive and logistically challenging. Seismic surveys, which translate seismic velocities into firn densities, offer an efficient alternative. This study employs Distributed Acoustic Sensing technology to transform an existing fiber-optic cable near the South Pole into a multichannel, low-maintenance, continuously interrogated seismic array. The data resolve 16 seismic wave propagation modes at frequencies up to 100 Hz that constrain P and S wave velocities as functions of depth. Using co-located geophones for ambient noise interferometry, we resolve very weak radial anisotropy. Leveraging nearby SPICEcore firn density data, we find prior empirical density-velocity relationships underestimate firn air content by over 15%. We present a new empirical relationship for the South Pole region.
期刊介绍:
Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.