海洋最大的富含叶绿素的舌头正在向西延伸 (2002-2022年)
Shuaixing Peng1, Xiaolong Yu1, Zhongping Lee1
1State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen, Fujian, 361102, China.
Nature communications
|January 3, 2025
概括
太平洋的叶绿素丰富的舌头正在向西扩张,这是由强风和上游驱动的. 这个富有生产力的海洋地区正在增长,而周围的海洋旋转也向极地延伸.
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:
- 赤道太平洋的富含叶绿素的舌头 (CRT) 支持全球重要的新产量.
- 由于全球变暖,在CRT的北方和南方存在的寡热带亚热带旋转可能正在扩大.
- 气候变化对CRT范围的变化目前尚不清楚.
研究的目的:
- 调查赤道太平洋的富含叶绿素的舌头 (CRT) 的历史变化.
- 量化过去二十年中CRT的扩张或收缩速度.
- 了解CRT的动态和周围的亚热带旋转之间的关系.
主要方法:
- 利用经验模式分解 (EMD) 来分析来自MODIS-Aqua卫星的20年每月甲度数据 (2002-2022年).
- 将EMD应用于来自卫星的叶绿素a测量,以确定CRT的趋势和空间范围变化.
- 分析了CRT和太平洋中部旋转地点的EMD结果.
主要成果:
- 富含叶绿素的舌头 (CRT) 显示出向西的显著延伸,以平均速度1.87 × 105公里2/年扩张.
- 西向的CRT延伸与强化的东方贸易风有关,加强了赤道上升和南方赤道流.
- 从2002年到2022年,同时观察到亚热带旋转的极向延伸和CRT的西向延伸.
结论:
- 在过去的20年里,赤道太平洋的富含叶绿素的生产性舌头显著向西扩张.
- 加剧的贸易风,与太平洋十年振荡的负面阶段相关,是这种扩张的主要驱动力.
- 同时扩张的CRT和亚热带旋转表明太平洋生产力和循环模式的显著转变,保证进一步研究气候和生态系统的影响.
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