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在丹曼和沙克尔顿冰架下面的循环和海洋冰架相互作用
Stephen R Rintoul1,2, Esmee M van Wijk1,2, Laura Herraiz-Borreguero1,2
1CSIRO Environment, Hobart, Tasmania, Australia.
Science advances
|December 5, 2025
概括
海洋热量推动南极冰架的基本融化. 在沙克尔顿冰架下方的观测显示,温水导致丹曼冰川大幅融化,可能导致不稳定的冰架撤退和海平面上升.
科学领域:
- 海洋学 海洋学 海洋学
- 冰川学的冰川学
- 气候科学 气候科学
背景情况:
- 海洋驱动的基底融化是冰架稀薄和减弱的关键因素.
- 冰架支对于调节进入海洋的冰流至关重要,并影响海平面上升.
- 观测冰架洞内的融化过程带来了重大挑战.
研究的目的:
- 为了研究推动沙克尔顿冰架洞穴基本融化的海洋学过程.
- 量化不同水量对冰融速率的影响.
- 为了评估丹曼冰川接地线的稳定性,以应对海洋强迫.
主要方法:
- 部署浮游艇,在冰架腔内收集海洋学数据.
- 分析不同深度的水温,盐度和当前数据.
- 根据观测数据推断海洋循环模式和融化速度.
主要成果:
- 在丹曼冰川下方深处的温水入侵导致了大量的基底融化.
- 在沙克尔顿冰架的剩余部分下面,由于与表面相关的水域较冷,发生了广泛但较弱的基底融化.
- 在丹曼冰川洞穴中推断出四个堆叠的翻转循环细胞,每个细胞都与特定的水质驱动的独特的基底融化有关.
- 丹曼冰川的洞穴对温暖水层厚度的变化很敏感,这表明有可能加速融化和不稳定的撤退.
结论:
- 沙克尔顿冰架的基底融化模式是异质的,丹曼冰川特别容易受到海洋变暖的影响.
- 目前的海洋状况表明,丹曼冰川是微妙平衡的,如果温水入侵增加,可能会迅速撤退.
- 沙克尔顿冰架的其余部分目前不太暴露在温暖的水中,但随着海洋循环模式的改变,这种情况可能会改变.
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