Sea level rise from West Antarctic mass loss significantly modified by large snowfall anomalies.

Sea level rise from West Antarctic mass loss significantly modified by large snowfall anomalies.
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DOI:
10.1038/s41467-023-36990-3
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发表时间:
2023-03-17
影响因子:
16.6
通讯作者:
Dutrieux, Pierre
Dutrieux, Pierre
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Davison, Benjamin J.;Hogg, Anna E.;Rigby, Richard;Veldhuijsen, Sanne;van Wessem, Jan Melchior;van den Broeke, Michiel R.;Holland, Paul R.;Selley, Heather L.;Dutrieux, Pierre

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西南极冰盖的质量损失主要是由冰川排入阿蒙森海湾(ASE),但异常降水对ASE的质量平衡的影响知之甚少。在这里,我们提出了一个25年(1996-2021年)的ASE输入输出质量平衡记录,并评估如何两个时期的异常降水影响其海平面的贡献。自1996年以来,ASE已经失去了3331 ± 424 Gt的冰,对全球海平面的贡献为9.2 ± 1.2 mm。总体而言,表面质量平衡异常的总质量损失贡献不大(7.7%),但是,两个异常降水事件有较大的,虽然短暂的,质量变化率的影响。在2009-2013年期间,持续的低降雪量导致了额外的51 ± 4 Gt yr−1的质量损失(对195 ± 4 Gt yr−1的总损失做出了积极贡献)。相比之下,2019年和2020年冬季的极端降水使这些年的质量损失减少了60 ± 16 Gt yr−1(对107 ± 15 Gt yr−1的总损失产生了负面影响)。这些结果强调了极端降雪变化对西南极短期海平面贡献的重要影响。作者将联合收割机对南极洲西部冰损失的测量与气候建模相结合,表明干旱或极端强降水的时期可以显着增加或减少持续数年的质量损失率。
Mass loss from the West Antarctic Ice Sheet is dominated by glaciers draining into the Amundsen Sea Embayment (ASE), yet the impact of anomalous precipitation on the mass balance of the ASE is poorly known. Here we present a 25-year (1996–2021) record of ASE input-output mass balance and evaluate how two periods of anomalous precipitation affected its sea level contribution. Since 1996, the ASE has lost 3331 ± 424 Gt ice, contributing 9.2 ± 1.2 mm to global sea level. Overall, surface mass balance anomalies contributed little (7.7%) to total mass loss; however, two anomalous precipitation events had larger, albeit short-lived, impacts on rates of mass change. During 2009–2013, persistently low snowfall led to an additional 51 ± 4 Gt yr−1 mass loss in those years (contributing positively to the total loss of 195 ± 4 Gt yr−1). Contrastingly, extreme precipitation in the winters of 2019 and 2020 decreased mass loss by 60 ± 16 Gt yr−1 during those years (contributing negatively to the total loss of 107 ± 15 Gt yr−1). These results emphasise the important impact of extreme snowfall variability on the short-term sea level contribution from West Antarctica. The authors combine measurements of ice loss from West Antarctica with climate modelling to show that periods of drought or extremely heavy precipitation can significantly increase or decrease rates of mass loss for periods lasting several years.
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Adusumilli S;Fricker HA;Medley B;Padman L;Siegfried MR
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影响因子: 5.2
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发表时间: 2019-12-11
影响因子: 5.2
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