低度介质营养回收控制生产率和出口
Keith B Rodgers1, Olivier Aumont2, Katsuya Toyama3
1WPI-Advanced Institute for Marine Ecosystem Change, Tohoku University, Sendai, Japan. keith.rodgers.b2@tohoku.ac.jp.
Nature
|August 21, 2024
概括
低度海洋产量主要由当地营养循环控制,而不是南大洋. 升温可能会使这种产量稳定或增加,因为中层层区域的营养物质保留率提高.
科学领域:
- 海洋学
- 海洋生态
- 气候科学
背景情况:
- 低度海洋对全球初级生产和出口至关重要.
- 之前的假设表明南大洋主导了LL的生产和出口,影响了应对气候变化.
- 了解海洋中的营养循环对于预测未来的生产力至关重要.
研究的目的:
- 调查LL初级生产和出口的主要驱动因素.
- 分析中性巨量营养素循环和南大洋影响的作用.
- 在不同的气候场景下,使用相结合模型对比项目第六阶段 (CMIP6) 模型预测未来的LL产量.
主要方法:
- 使用单个模型进行观察分析和敏感性研究.
- 在高排放 (SSP5-8.5) 和低排放 (SSP1-2.6) 场景下分析了五种CMIP6模型.
- 检查温度依赖的重矿化及其对营养保持的影响.
主要成果:
- 当地半层营养素循环控制了72%的LL初级生产和55%的出口.
- 南洋供应通过更深的翻转单元维持34%的LL出口;浅的北方供应仅维持7%.
- CMIP6模型显示LL产量预测存在显著差异;升温可能会稳定或增加LL产量,因为增加了营养物质的保留.
结论:
- 而不是南洋出口,是海洋生产的主要控制因素.
- 未来的海洋变暖可能会增强中层层的营养保持,可能会稳定或增加LL的产生.
- 对于预测未来的海洋生态系统变化而言,对中层层再矿化及其对变暖的敏感性的机制理解至关重要.
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