在赤道和南大西洋的极端复合事件
Regina R Rodrigues1, Camila Artana2, Afonso Gonçalves Neto3
1Department of Oceanography, Federal University of Santa Catarina, Florianópolis, SC, Brazil. regina.rodrigues@ufsc.br.
Nature communications
|April 16, 2025
概括
海洋热浪 (MHWs) 与高酸度和低叶绿素相结合,正在大西洋增加. 这些三重复合事件是由海洋前线的变化,水域的变暖和改变的空海热流驱动的.
科学领域:
- 海洋生物学 海洋生物学
- 海洋学 海洋学 海洋学
- 气候科学是气候科学.
背景情况:
- 当与其他极端事件相结合时,海洋生态系统面临海洋热浪 (MHWs) 的放大影响.
- 了解多种压力因素的相互作用对于预测生态系统反应至关重要.
研究的目的:
- 研究赤道和南大西洋的三重化合物事件 (MHW,高酸度,低叶绿素) 的时空进化.
- 分析不同大西洋地区这些复合极端事件背后的驱动因素.
主要方法:
- 利用基于观测的数据集和再分析产品来分析过去和现在的海洋条件.
- 研究了过去二十年来三重复合事件的频率,强度和空间分布.
- 确定了区域驱动因素,包括正面转移,海洋热传输,空海相互作用和上游动态.
主要成果:
- 在过去的二十年中,三重复合事件的频率和强度显著增加,最近达到顶峰.
- 区域性驱动因素包括两极转移 (安哥拉前线,巴西 - 马尔维纳斯流域),印度洋热水流入增加 (阿古拉斯泄漏),改变的空海热流 (西赤道/亚热带大西洋),以及上升 (东赤道大西洋) 的减弱.
- 三重复合事件在南大西洋在厄尔尼诺事件期间很普遍.
结论:
- 三重复合事件对大西洋海洋生态系统构成越来越大的威胁.
- 厄尔尼诺南部振荡 (ENSO) 事件与广泛的三重复合事件有关,为MHW预测提供了潜力.
- 了解区域驱动因素是减轻气候极端变化的影响的关键.
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