有证据表明,罗斯海中密集的架水变化的大规模气候强制作用
Zhaoru Zhang1,2,3,4, Chuan Xie5, Pasquale Castagno6
1Key Laboratory of Polar Ecosystem and Climate Change, Ministry of Education and School of Oceanography, Shanghai Jiao Tong University, Shanghai, China. zrzhang@sjtu.edu.cn.
Nature communications
|September 18, 2024
概括
南极地底水的形成与罗斯海多层中密集的架水生产有关. 南方年相模式影响了这一过程,影响了全球海洋循环.
科学领域:
- 海洋学 海洋学 海洋学
- 气候科学 气候科学
- 极地研究 极地研究
背景情况:
- 南极地底水 (AABW) 对于全球的热盐环流至关重要.
- 在南极的多层岩层中形成的密集的货架水 (DSW) 是AABW的起源.
- 罗斯海的波利尼亚对全球AABW产量做出了重大贡献 (20-40%).
研究的目的:
- 调查罗斯海的DSW生产和南方年制模式 (SAM) 的年间变化之间的相关性.
- 了解大气模式如何影响DSW形成和AABW产生.
主要方法:
- 使用了长时间的DSW测量记录.
- 综合数值模拟和卫星数据分析.
- 与南方环状模式 (SAM) 阶段和阿蒙森海低 (ASL) 位置相关联的DSW生产.
主要成果:
- 在DSW生产变化和SAM之间发现了显著的相关性.
- 最强的相关性发生在阿蒙森海低 (ASL) 减弱并转移到罗斯海以东时.
- 积极的SAM阶段,海上风力增强和温度降低,增加了DSW形成.
结论:
- 南方年状模式 (SAM) 在罗斯海中显著调节密集架水 (DSW) 产量.
- 在SAM和阿蒙森海低 (ASL) 位置的变化直接影响南极地底水 (AABW) 形成.
- 预计SAM的变化表明DSW和AABW生产的未来变化.
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