北大西洋亚热带旋转:SOFAR漂浮物被停泊的监听站跟踪
概括
声调和测距 (SOFAR) 浮标揭示了北大西洋中一个动态的海湾流. 中深轨迹显示了循环和透的变化,海湾流附近的动动能增加.
科学领域:
- 海洋学 海洋学 海洋学
- 物理海洋学 物理海洋学
- 流体动力学 流体动力学
背景情况:
- 了解海洋流及其变异性对于气候和海洋生态系统研究至关重要.
- 海湾流和亚热带旋转是北大西洋循环的关键组成部分,影响天气模式和海洋生物.
- 之前的研究往往缺乏该地区详细的深度轨迹数据.
研究的目的:
- 通过使用声学跟踪的SOFAR浮标,研究海湾流和亚热带旋流在中深度的变化.
- 分析西北大西洋海流和的动能特征的空间和时间特征.
- 为湾流的动态行为提供见解,包括再循环和透事件.
主要方法:
- 在1980年5个月的时间里,声学跟踪17个声音定位和距离 (SOFAR) 浮标.
- 利用停泊的自主监听站来确定浮动轨迹.
- 在东部海湾流和亚热带旋转内部700米和2000米的深度收集的数据.
主要成果:
- 获得了17个中深浮动轨迹,揭示了时间变化的湾流.
- 观察到的例子是,河流以南向西的狭窄,快速的循环,并向东北透到纽芬兰盆地.
- 记录了从旋转内部到海湾流2000米处的旋转运动能量增加了一百倍.
结论:
- 墨西哥湾流在中深处表现出显著的变化,挑战其结构的简单模型.
- 与内陆亚热带旋转相比,海湾流内的动动能大大高于内陆亚热带旋转.
- 这些发现强调了详细的观测数据对于理解复杂的海洋循环动态的重要性.
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