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气候系统的不对称性驱动在早期的伊欧纪温室气候期间水气候的偏心节奏
Andrew P Walters1, Jessica E Tierney1, Jiang Zhu2
1Department of Geosciences, University of Arizona, Tucson, AZ 85721, USA.
Science advances
|August 4, 2023
概括
用叶同位素分析了北美西部地球过去的温室气候 (EECO) 水气候变化. 轨道强迫显著影响了降水量及其同位素组成,主要是在夏季.
科学领域:
- 古气候学 古气候学
- 同位素地球化学 同位素地球化学
- 气候建模气候模型
背景情况:
- 早期纪气候最佳时期 (EECO) 是地球上最后一个长期的温室时期.
- 了解在这段时间内的水气候变化对于预测未来的气候变化至关重要.
- 陆地古气候档案提供了对过去水文循环的洞察.
研究的目的:
- 为了重建北美西部在EECO期间的水气候变化.
- 为了研究轨道强迫对古气候记录的影响.
- 为了解释离心率在无冰的温室中占主导地位,世界气候记录.
主要方法:
- 从绿河形成中开发一个轨道解析的叶同位素 (δ2Hwax) 记录.
- 对δ2Hwax变化的分析,以确定轨道强迫 (离心率和前行).
- 利用社区地球系统模型 (CESM) 模拟气候对轨道变化的反应.
主要成果:
- δ2Hwax记录显示出显著的变化 (∼60‰),表明对轨道强迫的敏感性.
- 模拟显示,轨道变化导致大量的季节性降水和δ2H变化,特别是在夏季.
- 对δ2Hwax的天文强迫与不对称的气候反应,前置剪切和不对称的碳循环动态有关.
结论:
- 轨道强迫,特别是离心率,在EECO期间显著调节了水文循环.
- 这项研究解释了异常的出现,作为无冰的温室气候记录中占主导频率的原因.
- 这些发现提高了我们对极端温室条件下的气候动态的理解.
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