Increased ice loading in the Antarctic Peninsula since the 1850s and its effect on glacial isostatic adjustment
Increased ice loading in the Antarctic Peninsula since the 1850s and its effect on glacial isostatic adjustment
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DOI：
10.1029/2012gl052559
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发表时间：
2012-09
影响因子：
5.2
通讯作者：
G. Nield;P. Whitehouse;Matt A. King;P. Clarke;M. J. Bentley
中科院分区：
文献类型：
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作者：
G. Nield;P. Whitehouse;Matt A. King;P. Clarke;M. J. Bentley
南极半岛（AP）冰芯记录表明，自1855年以来，冰的积累显著增加，任何由此产生的冰质量增加都有可能对当今的冰川均衡调整（GIA）做出重大贡献。我们从气候模式输出中导出经验正交函数来推断AP累积的典型空间格局，并结合冰芯记录估算1855-2010年期间的年累积。作为对这一积累历史的响应，高分辨率冰盖模型预测，冰盖厚度将增加45米，其中AP北部和西部的增厚最大。尽管预计这种增厚对GRACE估计的影响不超过6.2 Gt/年，但根据所选择的地球模型，它可能对当前GIA的隆升率贡献高达- 7毫米/年。具有强烈的东西梯度。因此，考虑这一因素对于解释观测到的GPS在亚太地区的速度至关重要。
Antarctic Peninsula (AP) ice core records indicate significant accumulation increase since 1855, and any resultant ice mass increase has the potential to contribute substantially to present‐day glacial isostatic adjustment (GIA). We derive empirical orthogonal functions from climate model output to infer typical spatial patterns of accumulation over the AP and, by combining with ice core records, estimate annual accumulation for the period 1855–2010. In response to this accumulation history, high resolution ice‐sheet modeling predicts ice thickness increases of up to 45 m, with the greatest thickening in the northern and western AP. Whilst this thickening is predicted to affect GRACE estimates by no more than 6.2 Gt/yr, it may contribute up to −7 mm/yr to the present‐day GIA uplift rate, depending on the chosen Earth model, with a strong east‐west gradient across the AP. Its consideration is therefore critical to the interpretation of observed GPS velocities in the AP.