北大西洋西部边界电流在36°N的变化模式
Shun Mao1, Ruoying He2, Magdalena Andres3
1North Carolina State University, Raleigh, NC, USA.
Scientific reports
|November 1, 2023
概括
像海湾流 (GS) 和海特拉斯角附近的深西部边界流 (DWBC) 这样的海洋流表现出变化. 分析显示,曲和强风模式主导GS电流变化.
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:
- 墨西哥湾流 (GS) 和深西边界流 (DWBC) 是北大西洋的关键西部边界流.
- 它们在哈特拉斯角附近的相互作用区是一个动态的区域,影响区域和全球海洋循环.
- 了解它们的变性对于气候和海洋生态系统研究至关重要.
研究的目的:
- 量化GS和DWBC的速度结构中的可变性.
- 通过使用高分辨率的海洋再分析数据集,识别主导变异模式.
- 通过独立的观测数据验证重新分析模型.
主要方法:
- 利用了2017-2018年数据同化,高分辨率 (800米) 区域海洋再分析的每日输出.
- 通过独立的海洋速度和密度观测证实了重新分析的有效性.
- 应用旋转的实证直角函数 (EOF) 分析到每日速度时间序列.
主要成果:
- 确定了特征西边界电流变化的三个主要模式.
- 主模式 (55.3%的差异) 与GS电流曲有关.
- 确定了受到DWBC和风影响的二次风力强制模式 (12.5%的变异) 和第三种模式 (7.1%的变异).
结论:
- 该研究使用经过验证的海洋再分析成功量化了GS和DWBC的变化.
- 墨西哥湾流的曲是推动该地区电流变化的主要因素.
- 风力强迫和DWBC和旋的影响也对观察到的模式做出了重大贡献.
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