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早期普略纪温暖的模式和机制
A V Fedorov1, C M Brierley, K T Lawrence
1Department of Geology and Geophysics, Yale University, New Haven, Connecticut 06511, USA. alexey.fedorov@yale.edu
Nature
|April 5, 2013
概括
早期普略纪温暖的特点是,尽管海洋最高温度相似,但温度梯度较低. 目前的模型很难复制这些条件,这表明气候反被低估了.
科学领域:
- 古气候学 古气候学
- 地球系统科学 地球系统科学
背景情况:
- 早期的普略纪 (500万至400万年前) 经历了一个温暖,温和的气候.
- 随后的冷却建立了现代温度模式,可能与大气CO2降低100ppm有关.
- 了解过去的温暖气候对于预测未来的气候变化至关重要.
研究的目的:
- 为了合成早期普略纪海洋表面温度的地化学代理记录.
- 为了与今天的条件比较早期普略纪的温度梯度和最大海洋温度.
- 通过地球系统模型评估现有的普略纪温暖机制.
主要方法:
- 综合海洋表面温度 (SST) 的地化学代理记录.
- 对南部和区域温度梯度的分析.
- 利用地球系统模型来模拟早期普略纪气候条件.
主要成果:
- 早期的普略纪表现出明显较低的南部和区域温度梯度比今天.
- 普略纪早期的最大海洋温度与当前水平相似.
- 现有的拟议机制未能同时复制所有观察到的早期普略纪气候特征.
结论:
- 低估的动态反的组合可能解释了早期普略纪的气候.
- 与海洋混合和云白度相关的反需要进一步调查.
- 需要改进的气候模型来准确地表示过去的温暖气候状态.
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