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Antarctic ice mass variations from 1979 to 2017 driven by anomalous precipitation accumulation
Scientific Reports ( IF 3.8 ) Pub Date : 2020-11-23 , DOI: 10.1038/s41598-020-77403-5
Byeong-Hoon Kim , Ki-Weon Seo , Jooyoung Eom , Jianli Chen , Clark R. Wilson

Antarctic ice mass balance is determined by precipitation and ice discharge, and understanding their relative contributions to contemporary Antarctic ice mass change is important to project future ice mass loss and resulting sea level rise. There has been evidence that anomalous precipitation affects Antarctic ice mass loss estimates, and thus the precipitation contribution should be understood and considered in future projections. In this study, we revisit changes in Antarctic ice mass over recent decades and examine precipitation contributions over this period. We show that accumulated (time-integrated) precipitation explains most inter-annual anomalies of Antarctic ice mass change during the GRACE period (2003–2017). From 1979 to 2017, accumulated Antarctic precipitation contributes to significant ice mass loss acceleration in the Pacific sector and deceleration in the Atlantic-Indian Sectors, forming a bi-polar spatial pattern. Principal component analysis reveals that such a bi-polar pattern is likely modulated by the Southern Annular Mode (SAM). We also find that recent ice mass loss acceleration in 2007 is related to a variation in precipitation accumulation. Overall ice discharge has accelerated at a steady rate since 1992, but has not seen a recent abrupt increase.



中文翻译:

1979年至2017年南极冰块变化是由异常降水积累驱动的

南极冰块的平衡取决于降水和冰的排放,因此了解它们对当代南极冰块变化的相对贡献对于预测未来冰块的损失和由此引起的海平面上升非常重要。有证据表明异常降水会影响南极冰块的损失估算,因此在未来的预测中应了解并考虑降水的贡献。在这项研究中,我们回顾了近几十年来南极冰块的变化,并研究了这一时期的降水贡献。我们显示,累积(时间积分)降水解释了GRACE期间(2003-2017年)南极冰量变化的大多数年际异常。从1979年到2017年,积聚的南极降水促使太平洋地区的冰块大量减少,而大西洋-印度地区的冰块减少,形成了两极的空间格局。主成分分析表明,这种双极性模式可能是由南环形模式(SAM)调制的。我们还发现,2007年最近的冰块质量损失加速与降水积聚的变化有关。自1992年以来,冰的总体排放量一直以稳定的速度加速,但是最近没有突然增加。我们还发现,2007年最近的冰块质量损失加速与降水积聚的变化有关。自1992年以来,冰的总体排放量一直以稳定的速度加速,但是最近没有突然增加。我们还发现,2007年最近的冰块质量损失加速与降水积聚的变化有关。自1992年以来,冰的总体排放量一直以稳定的速度加速,但是最近没有突然增加。

更新日期:2020-11-23
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