Brief communication: An empirical relation between center frequency and measured thickness for radar sounding of temperate glaciers
Brief communication: An empirical relation between center frequency and measured thickness for radar sounding of temperate glaciers
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简讯：温带冰川雷达探测中心频率与测量厚度之间的经验关系
DOI：
10.5194/tc-15-2569-2021
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
J. Paden
中科院分区：
文献类型：
--
作者：
J. MacGregor;M. Studinger;E. Arnold;C. Leuschen;F. Rodríguez‐Morales;J. Paden
摘要。温带冰川厚度的雷达探测比极地冰盖更具挑战性，因为温带冰川有更强的体散射（冰内水）、表面散射（裂隙和碎屑）以及介电衰减率（温度较高的冰）。通常采用较低频率（约1 - 100兆赫兹）的雷达探测器来减轻这些影响，但由于缺乏对温带冰川现有雷达探测调查的综合研究，限制了系统和调查设计的进展。在此，我们利用近期对测量的冰川厚度的全球综合数据来评估雷达中心频率和最大厚度之间的关系。从1兆赫兹附近约1500米的最大报告厚度来看，可探测的最大厚度随着频率的增加而降低，每频率十倍频程约降低500米。在可比频率下，新型机载雷达探测器通常优于老式的地面雷达探测器，因此雷达探测器的成功也受系统设计和处理方法的影响。基于全球模拟的冰川厚度，我们得出结论：一个中心频率≤30兆赫兹的多元件机载雷达探测器能够比现有的系统更高效地探测大多数温带冰川。
Abstract. Radar sounding of the thickness of temperate glaciers is more challenging than for polar ice sheets, due to the former's greater volume scattering (englacial water), surface scattering (crevasses and debris) and dielectric attenuation rate (warmer ice). Lower frequency (~1–100 MHz) radar sounders are commonly deployed to mitigate these effects, but the lack of a synthesis of existing radar-sounding surveys of temperate glaciers limits progress in system and survey design. Here we use a recent global synthesis of measured glacier thickness to evaluate the relation between the radar center frequency and maximum thickness. From a maximum reported thickness of ~1500 m near 1 MHz, the maximum thickness sounded decreases with increasing frequency by ~500 m per frequency decade. Newer airborne radar sounders generally outperform older, ground-based ones at comparable frequencies, so radar-sounder success is also influenced by system design and processing methods. Based on globally modeled glacier thicknesses, we conclude that a multi-element airborne radar sounder with a center frequency of ≤ 30 MHz could survey most temperate glaciers more efficiently than presently available systems.
CReSIS 机载雷达和冰雪探测平台
影响因子：
2.9
作者：
Arnold, Emily;Leuschen, Carl;Rodriguez-Morales, Fernando;Li, Jilu;Paden, John;Hale, Richard;Keshmiri, Shawn
通讯作者：
Keshmiri, Shawn
影响因子：
2.9
作者：
Pritchard, H. D.;King, E. C.;Kayastha, R.
通讯作者：
Kayastha, R.
影响因子：
18.3
作者：
Farinotti, Daniel;Huss, Matthias;Pandit, Ankur
通讯作者：
Pandit, Ankur