由于深赤道大西洋迫使大气中的年间变化
Peter Brandt1, Andreas Funk, Verena Hormann
1IFM-GEOMAR, Leibniz-Institut für Meereswissenschaften an der Universität Kiel, Düsternbrooker Weg 20, 24105 Kiel, Germany. pbrandt@ifm-geomar.de
Nature
|May 20, 2011
概括
新发现的大西洋深处一个为期4.5年的气候周期,由深层区域喷气驱动,影响海面温度,风和降雨. 这一发现可以改善热带大西洋气候预测.
科学领域:
- 海洋学 海洋学 海洋学
- 大气科学 大气科学
- 气候动力学 气候动力学
背景情况:
- 热带大西洋气候变化受到海洋大气相互作用,厄尔尼诺/南方振荡和北大西洋振荡的影响.
- 现有的模型表明,十年和年间的变化是由两个结合的海洋-大气模式主导的.
- 在热带大西洋气候中,内在深海动态的作用是不太了解的.
研究的目的:
- 研究深赤道大西洋海洋动态对区域气候模式的影响.
- 在热带大西洋中识别和描述新的气候周期.
- 通过这些发现,评估改善气候预测的潜力.
主要方法:
- 对深度海洋学数据的分析,以识别深海区域喷流.
- 追踪从深海到海面的能量传播.
- 与海面温度,风力和降雨异常相关联的深层喷气活动.
主要成果:
- 在大西洋深处发现了垂直交替的深区域喷气,其周期为4.5年.
- 观测到这些喷气到海面上升的能量传播.
- 与赤道电流,东大西洋温度和独特的天气模式相关的表面异常.
结论:
- 在赤道大西洋的深海动态驱动着一个显著的4.5年的气候周期.
- 这一循环影响海面温度,风和降雨,影响区域气候.
- 鉴定到的振荡行为为增强热带大西洋气候预测提供了潜力.
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