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大西洋深度西部边界电流在南北8度处的旋转转变为
M Dengler1, F A Schott, C Eden
1Leibniz-Institut für Meereswissenschaften, Düsternbrooker Weg 20, 24105 Kiel, Germany. mdengler@ifm-geomar.de
大西洋的深西边界电流在8°S处破裂成,迁移的将北大西洋深水运往南方. 这种断裂发生在当前翻转循环强度时,与连续流动不同.
科学领域:
- 海洋学 海洋学 海洋学
- 气候科学 气候科学
- 流体动力学 流体动力学
背景情况:
- 深西边界电流对全球海洋循环至关重要,它将深水形成区与上游区域连接起来.
- 这些海流沿着大陆斜坡在1500~4000米深处存在,将北大西洋深水向南运输.
- 大西洋深西部边界流的传输量估计为 (10-40) x 10^6 m^3/s.
研究的目的:
- 为了研究大西洋深度西部边界流的行为和结构.
- 为了确定北大西洋深水是如何运输到南大西洋.
- 分析海洋循环强度对深度西部边界流的影响.
主要方法:
- 从2000年至2003年进行的直接速度和水质观测.
- 数字海洋循环模型.
主要成果:
- 观察到大西洋深度西部边界电流在南南8度处断裂.
- 在南8度以南,北大西洋的深水运输是通过迁移的旋流来实现的,而不是连续的流.
- 模型模拟表明,这种断裂与当前南部翻转循环的强度有关.
结论:
- 对于南大西洋,已建立的连续深度西部边界电流模型并不准确.
- 迁移的旋在南方深水运输中发挥着重要作用.
- 一个较弱的翻转循环可能允许一个稳定的,层状边界流.
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