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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >A method for detecting rapid mass flux of small glaciers using local sea level variations
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A method for detecting rapid mass flux of small glaciers using local sea level variations

机译：利用局部海平面变化检测小型冰川快速质量通量的方法

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There is increasing evidence that the global reservoir of small (or mountain) glaciers is presently experiencing an accelerated phase of net melting, perhaps linked to climatic warming. We argue that relative sea level and sea surface fingerprints local to such events provide a potentially powerful, integrated diagnostic for the mass imbalance. For example, we demonstrate, using an inference of glacier mass balance near Alaska over the last 50 years, that the present-day relative sea level fall at nearby sites can reach amplitudes that are ～2 orders of magnitude greater than the ongoing eustatic sea level rise associated with the melting. The peak sea surface subsidence is a factor of ～15 greater than the eustatic amplitude. We find that the predicted present-day sea surface change arising from the 50-year loading history is sensitive only to the ongoing rate of accelerated melting. In contrast, the present-day relative sea level fingerprint becomes increasingly sensitive to the 'history' of the recent loading when the viscosity of the asthenosphere adopted in the prediction is progressively reduced below 10~(20) Pa s. Specifically, the relative sea level fingerprint becomes more localized, and reaches higher amplitudes, close to the glacier system as viscous effects become active. Our results have application in efforts to constrain small glacier mass balance using tide gauge records of relative sea level change or satellite-derived constraints on sea surface (geoid) rates.
机译：越来越多的证据表明，全球小型（或山区）冰川水库目前正在经历净融化的加速阶段，这可能与气候变暖有关。我们认为，此类事件局部的相对海平面和海面指纹为质量失衡提供了潜在的强大综合诊断方法。例如，根据过去50年阿拉斯加附近冰川质量平衡的推论，我们证明了附近站点今天的相对海平面下降幅度可能比持续进行中的海平面幅度大2个数量级。与融化有关的上升。海平面下沉峰值比平地振幅大约15倍。我们发现，由50年的装载历史引起的当今预测的海面变化仅对持续加速的融化速率敏感。相反，当在预测中采用的软流层的粘度逐渐降低到10〜（20）Pa s以下时，当今的相对海平面指纹对最近负荷的“历史”变得越来越敏感。具体而言，相对的海平面指纹变得更加局部化，并随着粘性效应变得活跃而达到更高的幅度，接近冰川系统。我们的研究结果已用于通过使用潮汐仪记录的相对海平面变化或卫星派生的海表（地表）速率约束来限制小冰川质量平衡的应用中。

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