Modeling the spreading of glacial meltwater from the Amundsen and Bellingshausen Seas
Modeling the spreading of glacial meltwater from the Amundsen and Bellingshausen Seas
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DOI：
10.1002/2014gl061600
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发表时间：
2014-11-28
影响因子：
5.2
通讯作者：
Hellmer, H. H.
中科院分区：
文献类型：
--
作者：
Nakayama, Y.;Timmermann, R.;Hellmer, H. H.
有人认为，阿蒙森海（AS）和别令斯豪森海（BS）大陆冰融化的增加可能是罗斯海（RS）海水变新鲜的一个来源。为了验证这一假设，我们使用有限元海冰/冰架/海洋模型模拟冰川融水的扩散。从模拟被动示踪剂的空间分布来看，AS冰架的基底融水大部分流向RS，其中一半以上的融水来自Getz冰架。此外，模式结果表明，由于融冰驱动的陆架环流和向西流动的海岸流的加强，基底质量损失的轻微增加可以大大加强融水向RS的输送。这支持了AS和BS冰架的基底融化是RS更新的主要来源之一的观点。
It has been suggested that an increased melting of continental ice in the Amundsen Sea (AS) and Bellingshausen Sea (BS) is a likely source of the observed freshening of Ross Sea (RS) water. To test this hypothesis, we simulate the spreading of glacial meltwater using the Finite Element Sea Ice/Ice Shelf/Ocean Model. Based on the spatial distribution of simulated passive tracers, most of the basal meltwater from AS ice shelves flows toward the RS with more than half of the melt originating from the Getz Ice Shelf. Further, the model results show that a slight increase of the basal mass loss can substantially intensify the transport of meltwater into the RS due to a strengthening of the melt-driven shelf circulation and the westward flowing coastal current. This supports the idea that the basal melting of AS and BS ice shelves is one of the main sources for the RS freshening.