非线性中等尺度旋对近地表海洋叶绿素的影响
Dudley B Chelton1, Peter Gaube, Michael G Schlax
1College of Oceanic and Atmospheric Sciences, 104 COAS Administration Building, Oregon State University, Corvallis, OR 97331-5503, USA. chelton@coas.oregonstate.edu
概括
海洋,而不是线性罗斯比波,驱动大规模的叶绿素变异性. 这些非线性结构通过水平向导影响叶绿素,需要重新评估海洋动态.
科学领域:
- 海洋学 海洋学 海洋学
- 卫星海洋学 卫星海洋学
- 海洋生态海洋生态学
背景情况:
- 海洋罗斯比波以前被认为可以解释从卫星观察到的大规模叶绿素变异性.
- 最近的高分辨率卫星高度测量显示,这些特征是非线性中介尺度连贯结构,称为.
研究的目的:
- 重新评估驱动海面高度 (SSH) 和叶绿素 (CHL) 的共变性机制.
- 为了研究非线性中等尺度旋对上层海洋叶绿素场的影响.
主要方法:
- 分析了10年的SSH领域的卫星高度计测量结果.
- 同时分析上海CHL的卫星测量结果.
- 研究旋结构与CHL分布之间的关系.
主要成果:
- 非线性中等尺度旋,而不是线性罗斯比波,显著影响海洋的叶绿素场.
- 由旋转速度引起的带引发的水平偏移是CHL在超过2-3周的时间尺度上的变化的主要机制.
结论:
- 需要强调的是海洋在调节叶绿素中的作用.
- 以前对SSH特征的解释是线性罗斯比波需要修订.
- 厄迪动力学是了解海洋生产力和生物地球化学循环的关键因素.
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