在东南极海底峡谷内,持续向极地流动的温暖水的足迹
Federica Donda1, Michele Rebesco2, Vedrana Kovacevic2
1National Institute of Oceanography and Applied Geophysics-OGS, Borgo Grotta Gigante 42/c, 34010, Sgonico, Trieste, Italy. fdonda@ogs.it.
Nature communications
|July 17, 2024
概括
海底峡谷将温暖的海洋水运送到东南极洲,增加冰层融化和海平面上升. 了解这些路径对于预测未来南极冰盖的行为至关重要.
科学领域:
- 海洋学 海洋学 海洋学
- 冰川学的冰川学
- 地质地质地质地质地质地
背景情况:
- 温暖的海洋水入南极大陆架加速了冰架和海底冰川的基本融化.
- 虽然东南极大陆架上已知温水循环,但其从深海运输机制仍然不确定.
- 这种不确定性使东南极主要冰川的预测变得复杂,如托特恩和尼尼斯.
研究的目的:
- 研究海底峡谷在将温暖的环极深水 (CDW) 运送到东南极大陆架的作用.
- 确定促进热水入侵的关键通道及其对南极冰川的影响.
主要方法:
- 对海底峡谷东侧沉积物漂流的分析.
- 对峡谷特征的地形学解释,以推断过去的海洋学过程.
主要成果:
- 海底峡谷充当向南流动的管道,将温暖的CDW输送到东南极架裂.
- 沉积物漂移表明从这些峡谷开始的持续向南的流动.
- 这些特征确定了易受增强海洋热传输的影响的区域.
结论:
- 海底峡谷在促进热水侵入东南极大陆架方面发挥着至关重要的作用.
- 了解这些峡谷驱动的运输机制对于评估过去,现在和未来的冰川融化至关重要.
- 这项研究对预测由于南极冰层消失而导致的海平面上升具有重大意义.
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