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使用Bolling-Allerod变暖的新机制对最后一次脱冰的过渡模拟
Z Liu1, B L Otto-Bliesner, F He
1Key Laboratory of Meteorological Disaster, Nanjing University of Information Science and Technology, Nanjing, 210044, China. zliu3@wisc.edu
概括
模拟了Bølling-Allerød变暖的情形,并使用了一个合的气候模型. 这种突然的变暖是由大西洋南部翻转循环引发的.
科学领域:
- 古气候学 古气候学
- 气候建模 气候建模
- 海洋 - 大气相互作用.
背景情况:
- 最后的冰川最大到Bølling-Allerød (BA) 过渡代表了快速气候变化的关键时期.
- 了解驱动BA变暖等突然气候变化的机制对于预测未来气候动态至关重要.
研究的目的:
- 通过同步合的大气-海洋一般循环模型,研究从最后一个冰川最大期到BA变暖的脱冰气候演变.
- 为了阐明大西洋南部翻转循环 (AMOC) 在BA突然变暖事件中的作用.
主要方法:
- 进行了第一个同步合的大气和海洋一般循环模型模拟,涵盖了从最后冰川最大期到BA变暖的时期.
- 分析了模型模拟的关键降冰气候特征和AMOC的动态.
主要成果:
- 该模型成功地重现了除冰期气候演变的主要特征,表明与观测气候灵敏度的良好一致.
- 模拟BA的突然变暖是AMOC对停止向北大西洋排放淡水的暂时反应.
- 为BA过渡提出了一种新的机制,涉及对CO2强迫反应的叠加,从海因里希事件1中恢复AMOC,以及AMOC超标.
结论:
- 这项研究提供了一个新的视角,看待波林-阿勒罗德突然变暖的驱动因素,强调AMOC动态的作用.
- 这些发现表明,外部强迫和内部海洋大气变化的相互作用可以导致快速的气候变化.
- 该模型在模拟关键古气候事件方面的成功证明了它对研究过去和未来气候变化的实用性.
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