High spatial and temporal variability in Antarctic ice discharge linked to ice shelf buttressing and bed geometry.

High spatial and temporal variability in Antarctic ice discharge linked to ice shelf buttressing and bed geometry.
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DOI:
10.1038/s41598-022-13517-2
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发表时间:
2022-06-29
期刊:
影响因子:
4.6
通讯作者:
--
中科院分区:
综合性期刊3区
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--
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南极洲对全球平均海平面上升的贡献是由于流入海洋的冰量增加所致。因此,在预计未来变暖的背景下,考虑冰排放变化的速率和机制非常重要。在这里,我们报告了从大型流域到单个出口冰川流域的各种空间尺度上南极冰盖冰流量的年代际趋势和年际变化的观测结果。总体而言,我们发现 1999 年至 2010 年间流量增加了 37 ± 11 Gtyear−1,但 2010 年至 2018 年间增加了 4 ± 8 Gtyear−1,增幅要小得多。此外,比较表明邻近的出口冰川可以同步运行,但其他冰川则表现出相反的趋势,尽管它们距离很近。我们将这种时空变化与冰架支撑的变化和当地冰川几何形状的调节效应联系起来。
Antarctica’s contribution to global mean sea level rise has been driven by an increase in ice discharge into the oceans. The rate of change and the mechanisms that drive variability in ice discharge are therefore important to consider in the context of projected future warming. Here, we report observations of both decadal trends and inter-annual variability in ice discharge across the Antarctic Ice Sheet at a variety of spatial scales that range from large drainage basins to individual outlet glacier catchments. Overall, we find a 37 ± 11 Gt year−1 increase in discharge between 1999 and 2010, but a much smaller increase of 4 ± 8 Gt year−1 between 2010 and 2018. Furthermore, comparisons reveal that neighbouring outlet glaciers can behave synchronously, but others show opposing trends, despite their close proximity. We link this spatial and temporal variability to changes in ice shelf buttressing and the modulating effect of local glacier geometry.
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