长期趋势和人类对表面海洋碳储存和酸化的强迫
1National Science and Technology Center for Disaster Reduction, New Taipei City, 231007, Taiwan.
Marine environmental research
|October 12, 2025
概括
海洋吸收大量大气中的二氧化碳,充当碳汇,但由于溶解无机碳的增加,海洋也在酸化. 这项研究揭示了1985-2022年海洋碳储存趋势和人类造成的影响.
科学领域:
- 海洋学 海洋学 海洋学
- 气候科学 气候科学
- 生物地质化学生物地质化学
背景情况:
- 海洋通过储存大气中的二氧化碳,在调节地球气候方面发挥着至关重要的作用.
- 由于二氧化碳的吸收,海洋酸化对海洋生态系统和生物地化学循环构成重大威胁.
- 了解海洋碳储存和酸化的长期趋势对于预测未来的气候情景至关重要.
研究的目的:
- 研究从1985年到2022年全球地表海洋碳储存和酸化的长期趋势和人为影响.
- 量化溶解无机碳 (DIC),总性 (TA),pH和空海二氧化碳流 (fgCO2) 的变化.
- 为了确定海洋碳动态中的结构变化,并评估海洋的缓冲能力.
主要方法:
- 使用了通过神经网络框架重建的高分辨率 (0.25° × 0.25°) 海洋产品.
- 应用了线性回归,曼-肯德尔测试和森的斜率估计器来量化趋势.
- 使用斯皮尔曼等级相关性和Bai-Perron断点分析来识别碳动态的变化.
主要成果:
- 观察到DIC (0.75 ± 0.015 μmol kg-1 yr-1) 的全球显著增加,表明每年的碳沉积量为~2.0 PgC yr-1.1.
- 记录了全球pH值下降 -0.00164 ± 0.000034单位/年,这意味着海洋酸化加剧.
- 显示空海二氧化碳流量 (fgCO2) 从0.32升至0.72mol C m−2 yr−1,反映出增强的碳汇,区域差异较大.
结论:
- 海洋捕获大气二氧化碳的能力正在增加,但其缓冲能力正在减弱,这引发了对未来碳捕获效率的担忧.
- 确定了海洋碳动态中的重大结构变化,与加速的人为强迫有关.
- 这些发现凸显了海洋在气候调节中的关键作用及其对人类压力的脆弱性日益增加.
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