An assessment of forward and inverse GIA solutions for Antarctica.
An assessment of forward and inverse GIA solutions for Antarctica.
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DOI：
10.1002/2016jb013154
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发表时间：
2016-09
影响因子：
3.9
通讯作者：
Bamber, Jonathan L.
中科院分区：
文献类型：
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作者：
Martin-Espanol, Alba;King, Matt A.;Zammit-Mangion, Andrew;Andrews, Stuart B.;Moore, Philip;Bamber, Jonathan L.
关键词：
在这项工作中，我们评估了南极冰川均衡调整（GIA）的最新估计，包括来自正演和逆演方法的估计。该评估是基于将估计的抬升速率与一组经过弹性校正的GPS垂直速度进行比较。这些都是从一个广泛的GPS网络中观测到的，并使用2009-2014年期间的数据进行了计算。我们发现，在以低地幔粘度和薄岩石圈为特征的南极洲特定地区，如南极半岛北部和阿蒙森海湾，其最近的冰流历史可能在当前的GIA中发挥作用，系统地低估了观测到的隆升率。许多GIA模型传统上放置了隆起最大值的区域，如Filchner - Ronne和Ross冰架的边缘，其隆起估计被发现高估了。GIA的估计显示，东南极洲内部的变化很大，这增加了由重力测量方法得出的冰盖质量平衡的不确定性。南极洲GIA解的正解和反解的分析和评估确定GIA解系统地低估/高估隆升速率的区域东南极洲内部的大变异性导致冰盖质量平衡的不确定性增加
In this work we assess the most recent estimates of glacial isostatic adjustment (GIA) for Antarctica, including those from both forward and inverse methods. The assessment is based on a comparison of the estimated uplift rates with a set of elastic‐corrected GPS vertical velocities. These have been observed from an extensive GPS network and computed using data over the period 2009–2014. We find systematic underestimations of the observed uplift rates in both inverse and forward methods over specific regions of Antarctica characterized by low mantle viscosities and thin lithosphere, such as the northern Antarctic Peninsula and the Amundsen Sea Embayment, where its recent ice discharge history is likely to be playing a role in current GIA. Uplift estimates for regions where many GIA models have traditionally placed their uplift maxima, such as the margins of Filchner‐Ronne and Ross ice shelves, are found to be overestimated. GIA estimates show large variability over the interior of East Antarctica which results in increased uncertainties on the ice‐sheet mass balance derived from gravimetry methods. Analysis and assessment of forward and inverse GIA solutions for Antarctica Identification of regions where GIA solutions systematically underpredict/overpredict the uplift rates Large variability over the interior of East Antarctica result in increased uncertainties on the ice‐sheet mass balance