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Quantifying Mixing using Magnetic Resonance Imaging
Published on: January 25, 2012
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由于赤道水域内海浪的破裂,减少了混合
Michael C Gregg1, Thomas B Sanford, David P Winkel
1Applied Physics Laboratory, College of Fishery and Ocean Sciences, University of Washington, Seattle, Washington 98105, USA. gregg@apl.washington.edu
Nature
|April 4, 2003
概括
在赤道附近,海洋混合效率较低. 与中度相比,赤道地区的内部波散射率和由此产生的交叉密度混合率在赤道地区明显较低.
科学领域:
- 海洋学 海洋学 海洋学
- 流体动力学 流体动力学
- 气候科学是气候科学.
背景情况:
- 海洋热量,盐和营养物质的运输主要发生在均密度的水体内.
- 在密度表面的混合对于地球的气候和生物分布至关重要.
- 内部波折是跨密度表面乱混合的主要驱动因素.
研究的目的:
- 为了研究内部波散和混合的度依赖.
- 扩展以前关于散射速率的中度发现到赤道地区.
- 为了量化太平洋和大西洋的密度表面的混合.
主要方法:
- 收集太平洋和大西洋的温度和速度波动数据.
- 观测42度北至2度南之间的海洋区域.
- 分析散射速率和混合在密度表面.
主要成果:
- 散射速率表现出强烈的度依赖,与理论预测保持一致.
- 在赤道附近,对于可比的内部波背景,散射率低于中度速率的10%.
- 在赤道水域,跨密度表面的混合大大减少.
结论:
- 海洋在密度表面上的混合在赤道附近的效率明显低.
- 减少赤道混合必须纳入数值海洋动态模型.
- 这些发现对气候变化建模和了解海洋生物地球化学循环有影响.
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