What Determines the Shape of a Pine-Island-Like Ice Shelf?
What Determines the Shape of a Pine-Island-Like Ice Shelf?
复制标题
是什么决定了松岛状冰架的形状？
DOI：
10.1029/2022gl101272
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发表时间：
2022
影响因子：
5.2
通讯作者：
Goldberg Daniel
中科院分区：
文献类型：
--
作者：
Nakayama Yoshihiro;Hirata Toshiki;Goldberg Daniel
冰架形状直接控制海洋热量入侵、接地线附近融化和支撑。人们对冰架形状的决定因素知之甚少，因为冰海耦合模拟通常旨在预测南极洲对海平面上升的贡献，并且不能解决小规模的冰海相互作用过程。我们对理想化的高分辨率松岛式模型配置进行冰海耦合模拟。我们表明，加速度引起的海洋融化和冰拉伸使冰架从接地线到冰架前沿变薄，这与之前的研究一致。在横流方向上，海洋融化和冰平流相互抵消，使冰架变平。从接地线到冰锋的冰层变薄的三分之一以上可归因于深度小于 500 米的海洋融化。我们的结果强调了整个冰架和海洋之间的相互作用过程对于确定冰架形状的重要性。
Ice shelf shape directly controls ocean heat intrusions, melting near the grounding line, and buttressing. Little is known about what determines ice‐shelf shape because ice‐ocean coupled simulations typically aim at projecting Antarctica's contribution to sea‐level rise and they do not resolve small‐scale ice‐ocean interactive processes. We conduct ice‐ocean coupled simulations for an idealized high‐resolution, Pine‐Island‐like model configuration. We show that ocean melting and ice stretching caused by acceleration thin the ice shelf from the grounding line toward the ice shelf front, consistent with previous studies. In the across‐flow direction, ocean melting and ice advection cancel each other out and flatten the ice shelf. More than one‐third of the ice thinning from grounding line to ice front can be attributed to ocean melting at depths shallower than 500 m. Our results emphasize the importance of interactive processes between the entire ice shelf and the ocean for determining the ice shelf shape.