Ross ice shelf vibrations
Ross ice shelf vibrations
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DOI：
10.1002/2015gl065284
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发表时间：
2015-09
影响因子：
5.2
通讯作者：
P. Bromirski;A. Diez;P. Gerstoft;R. Stephen;S. Bolmer;D. Wiens;R. Aster;A. Nyblade
中科院分区：
文献类型：
--
作者：
P. Bromirski;A. Diez;P. Gerstoft;R. Stephen;S. Bolmer;D. Wiens;R. Aster;A. Nyblade
2014 年 11 月，在罗斯冰架 (RIS) 上部署了宽带地震台，以研究海洋重力波引起的振动。距 RIS 前沿 100 公里且彼此相距不超过 10 公里的三个站的初始数据显示了分散的次重力 (IG) 波和源自北太平洋的波浪产生的海洋涌浪信号。 0.001 至 10 Hz 的频谱电平在 IG 频段 (0.0025–0.03 Hz) 中具有最高的加速度。偏振分析表明复杂的频率相关粒子运动，多个频带中的能量具有明显不同的传播特性。主导 IG 波段信号主要表现出来自北方的水平传播。粒子运动分析表明 IG 波段中存在逆行椭圆粒子运动，这与冰架/水腔系统中以瑞利-兰姆（弯曲）波形式传播的信号一致，这些信号是由靠近陆架前部的海浪相互作用激发的。
Broadband seismic stations were deployed across the Ross Ice Shelf (RIS) in November 2014 to study ocean gravity wave‐induced vibrations. Initial data from three stations 100 km from the RIS front and within 10 km of each other show both dispersed infragravity (IG) wave and ocean swell‐generated signals resulting from waves that originate in the North Pacific. Spectral levels from 0.001 to 10 Hz have the highest accelerations in the IG band (0.0025–0.03 Hz). Polarization analyses indicate complex frequency‐dependent particle motions, with energy in several frequency bands having distinctly different propagation characteristics. The dominant IG band signals exhibit predominantly horizontal propagation from the north. Particle motion analyses indicate retrograde elliptical particle motions in the IG band, consistent with these signals propagating as Rayleigh‐Lamb (flexural) waves in the ice shelf/water cavity system that are excited by ocean wave interactions nearer the shelf front.