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最后一次冰川退化和最后一次冰川间海平面上升的海洋强迫
Peter U Clark1,2, Feng He3, Nicholas R Golledge4,5
1College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, USA. clarkp@onid.orst.edu.
Nature
|January 31, 2020
概括
由于大西洋南部翻转循环 (AMOC) 的增加,海平面在最后一次脱冰期间上升得更快. 这种增强的强迫也导致了极地冰层在最后的间冰期 (LIG) 中的冰损失较大.
科学领域:
- 古气候学
- 冰川学
- 海洋学
背景情况:
- 尽管温度和温室气体压力相似,但海平面的历史在过去的两个冰期之间有所不同.
- 过去的间冰期 (LIG) 的海平面比现在高,
- 极地冰盖延伸到大陆架上,表明易受海洋强迫的影响.
研究的目的:
- 调查过去两次冰川退化期间海平面历史的巨大差异背后的原因.
- 为了解释LIG期间观察到的海平面上升,特别是极地冰盖的过量冰损失.
- 确定海洋强迫作用,特别是与大西洋南部翻转循环 (AMOC) 相关的地下变暖,在过去的海平面变化中.
主要方法:
- 分析最近两次冰川间隔的海平面历史和气候强迫数据.
- 模拟由AMOC变化的地下变暖对极地冰盖稳定性的影响.
- 通过化石珊瑚礁和洞穴来验证过去的海平面.
主要成果:
- 与最后一次降冰期相比,AMOC降低的较长时间导致了更大的地表变暖和更快的海平面上升.
- 这种增强的海洋强迫导致格陵兰岛和南极冰盖在LIG期间出现显著的冰损失.
- 在LIG期间的极地冰的过剩损失,与冰川静态调整相结合,解释了全球各个地点的相对海平面.
结论:
- 由于AMOC降低而导致的地下海洋变暖是解释不同海平面历史和更高LIG海平面的关键因素.
- 由于海洋强迫,格陵兰和南极地区的冰量大幅减少,超过了上次降冰的冰量.
- 了解这些过去的机制对于预测未来的海平面上升对于持续的气候变化和潜在的AMOC变化至关重要.
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