了解沿海脱氧对气动态的影响:一个观察分析
Laura Farias1,2,3, Lucas de la Maza4,5
1Departamento de Oceanografía, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Concepción, Chile. laura.farias@udec.cl.
Scientific reports
|May 23, 2024
概括
来自东部边界上游系统的温室气体排放量正在增加. 加剧的上升和缺氧导致氧化 (N2O) 的积累和空气-海流,影响气候和沿海生产力.
科学领域:
- 海洋生物地质化学海洋生物地质化学
- 海洋学 海洋学 海洋学
- 气候科学 气候科学
背景情况:
- 由于温室气体 (GHG) 的产生和排放,东边界上游系统 (EBUS) 对渔业和气候调节至关重要.
- 氧化 (N2O) 是一种强大的温室气体,其在EBUS中的动态尚未完全理解.
- 了解N2O循环对于评估气候反和沿海生态系统健康至关重要.
研究的目的:
- 在智利附近的EBUS中调查生物地球化学和海洋学变量的时间变化.
- 为了确定N2O度,缺乏和缺氧水条件之间的关系.
- 量化N2O积累和空海流量的十年趋势.
主要方法:
- 分析2000-2023年每月的海洋学和生物地球化学数据.
- 专注于溶解氧 (DO),酸盐,缺乏和N2O.
- 统计相关性分析和时间序列趋势分析.
主要成果:
- N2O度与30至80米层中的缺陷有很强的相关性.
- N2O空气-海流与低毒水的比例 (489 μmol L−1 DO) 有关.
- 在酸盐去除 (1.5μmol L−1/十年) 和N2O积累 (2.9 nmol L−1/十年) 中观察到显著的十年增长.
- 空气-海 N2O 流量显著增加 (2.9 μmol m−2 d−1/十年).
- 年间N2O的变化与上游的强度有关,而不是ENSO.
结论:
- 缺氧水中的部分脱是这种EBUS中N2O积累和流量的主要驱动因素.
- 在EBUS中加剧上游和扩大缺氧可以导致N2O排放增加.
- 这些变化对固定气损失,沿海生产力和气候调节有重大影响.
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