沿海被困的波浪和潮混合控制了安哥拉热带上游系统中的初级生产
Mareike Körner1, Peter Brandt1,2, Serena Illig3,4
1GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany.
Science advances
|January 26, 2024
概括
在热带安哥拉的上游系统中,沿海被困波浪 (CTW) 和潮混合,而不仅仅是风,推动季节性生产力. 在冬季,CTW提升营养丰富的水域,促进海洋生物.
科学领域:
- 海洋学 海洋学 海洋学
- 海洋生态海洋生态学
- 气候科学 气候科学
背景情况:
- 东部边界上游系统对海洋生物和初级生产至关重要.
- 上流的强度通常与当地的风力有关,但热带系统有例外.
研究的目的:
- 研究安哥拉热带上游系统 (tAUS) 季节性生产率最大的驱动因素.
- 澄清沿海被困波 (CTW) 和潮混合在这种现象中的作用.
主要方法:
- 分析海平面数据以确定沿海被困波 (CTW) 的振幅.
- 海洋学数据用于评估尼特拉克林的移位和垂直混合.
- 在CTW振幅和生产率变化之间进行相关性分析.
主要成果:
- 亚太地区的季节性生产率最大是由CTW和潮混合的联合影响驱动的.
- 上升的CTW在南方冬季将尼特拉克林移动超过50米.
- 升高的垂直混合促进了酸盐流入表面层的过程.
结论:
- 在 tAUS 的生产力不仅仅是风力驱动的,而且受到CTW和潮混合的显著影响.
- 年间生产率变化与CTW振幅相关,表明可预测性.
- 与赤道强迫相关的CTW提供了预测生产力强度的途径.
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