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自上次冰期以来大西洋南部翻转循环的演变:模型模拟和与现在和未来的相关性
1Department of Geography, The Ohio State University,154 North Oval Mall, Columbus OH 43210, USA.
概括
大西洋南部翻转循环 (AMOC) 在冰川周期中发生了显著的变化. 过去的AMOC强度与今天相似,尽管有冰川条件,由于平衡气候因素.
科学领域:
- 古海洋学是古海洋学.
- 气候建模气候模型
- 海洋学 海洋学 海洋学
背景情况:
- 大西洋南部翻转循环 (AMOC) 和其水体在冰川-间冰川周期期间表现出显著的变化.
- 了解过去的AMOC动态对于预测未来的气候变化至关重要.
研究的目的:
- 审查AMOC和自最后一个冰川最大期以来的相关水体建模的最新进展.
- 讨论过去的AMOC研究对当前和未来研究的影响.
主要方法:
- 利用碳同位素 (δ13C) 和同位素 (εNd) 来限制大西洋水体.
- 采用/比 (231Pa/230Th) 和氧同位素 (δ18O) 来限制AMOC强度.
- 审查了气候建模的近期进展.
主要成果:
- 发现大西洋水体受到碳和同位素的限制.
- 通过231Pa/230Th和δ18O梯度,AMOC强度更好地受到限制.
- 冰川时期的AMOC强度与今天相似,尽管循环较浅.
结论:
- 该研究强调了影响AMOC强度的因素的复杂相互作用.
- 过去的AMOC重建为了解当前和未来的海洋循环模式提供了宝贵的见解.
- 取消对二氧化碳上升和冰盖收缩的反应解释了冰川AMOC强度.
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