Ice thickness over the southern limit of the Amery Ice Shelf, East Antarctica, and reassessment of the mass balance of the central portion of the Lambert Glacier-Amery Ice Shelf system
Ice thickness over the southern limit of the Amery Ice Shelf, East Antarctica, and reassessment of the mass balance of the central portion of the Lambert Glacier-Amery Ice Shelf system
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DOI：
10.3189/2014aog66a154
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发表时间：
2014
影响因子：
2.9
通讯作者：
J. Wen;Long Huang;Weili Wang;T. H. Jacka;V. Damm;Yan Liu
中科院分区：
文献类型：
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作者：
J. Wen;Long Huang;Weili Wang;T. H. Jacka;V. Damm;Yan Liu
摘要利用BEDMAP项目数据库和PCMEGA（Prince Charles Mountains Expedition of德国and Australia）数据库中的联合收割机无线电回波探测冰厚数据，建立了东南极Amery冰架南界冰厚格网。然后，我们重新评估的质量平衡的兰伯特-埃默里系统的中心部分，将来自合成孔径雷达干涉测量（干涉合成孔径雷达）和一个模拟的表面质量平衡数据集的基础上区域大气模型的流量信息。我们的分析表明，梅洛尔和费舍尔冰川大致平衡的水平，我们的测量不确定性，而兰伯特冰川有一个积极的不平衡的4.2 ±2.3 Gta 1。整个Lambert冰川流域的物质收支大致平衡，冰架下游段的平均基底融化速率为5.1 ± 3.0 m a-1。我们的研究结果与最近使用流体静力学推导的冰厚数据的其他估计有很大不同。
Abstract We combine radio-echo sounding ice thickness data from the BEDMAP Project database and the PCMEGA (Prince Charles Mountains Expedition of Germany and Australia) dataset to generate a new ice thickness grid for the southern limit region of the Amery Ice Shelf, East Antarctica. We then reassess the mass balance of the central portion of the Lambert-Amery system, incorporating flow information derived from synthetic aperture radar interferometry (InSAR) and a modeled surface mass-balance dataset based on regional atmospheric modeling. Our analysis reveals that Mellor and Fisher Glaciers are approximately in balance to the level of our measurement uncertainty, while Lambert Glacier has a positive imbalance of 4.2 ±2.3 Gta1. The mass budget for the whole Lambert Glacier basin is approximately in balance, and the average basal melt rate in the downstream section of the ice shelf is 5.1 ± 3.0 m a-1. Our results differ substantially from other recent estimates using hydrostatically derived ice thickness data.