甲纪温度的低度季节性在温暖和寒冷的情节
Thomas Steuber1, Markus Rauch, Jean-Pierre Masse
1Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität, 44801 Bochum, Germany. thomas.steuber@ruhr-uni-bochum.de
Nature
|October 28, 2005
概括
甲时期的海面温度在较冷的时期显示出显著的季节性变化,这表明极地冰盖的潜在存在. 这个详细的分析使用Rudist双贝来重建过去的气候条件.
科学领域:
- 古气候学 古气候学
- 海洋地质 海洋地质学
- 古生物学的古生物学
背景情况:
- 纪时期一般是温暖的,但存在较冷的时期.
- 早期白时期的寒冷时期缺乏精确的时间和意义.
- 海洋表面温度季节性是了解气候梯度和极地冰的关键.
研究的目的:
- 详细重建白时期的海面温度季节性.
- 调查不同白纪气候阶段温度变化的重要性.
- 为极地冰盖的潜在存在提供新的见解.
主要方法:
- 对原始双动物 (Hippuritoidea) 内delta18O变化的分析.
- 使用来自北8至31度之间的古度的双化石.
- 将重建的温度季节性与现代气候数据进行比较.
主要成果:
- 高最高温度 (35-37°C) 低季节性 (<12°C) 在较温暖的白时期 (20-30°N).
- 在25°N附近的较冷的白纪时期出现显著的季节性变化 (高达18°C).
- 重建的季节性可与今天的范围相比.
结论:
- 鲁迪斯特双鱼提供了白时期海面温度季节性的详细记录.
- 在较冷的白时期,季节性温度波动很大,支持极地冰盖的存在.
- 这项研究完善了我们对白纪气候动态和极地条件的理解.
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