海洋酸化对大气中二氧化碳去除的反应
Jiu Jiang1, Long Cao2, Xiaoyu Jin2
1School of Environment, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China; State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Journal of environmental sciences (China)
|February 8, 2024
概括
人工去除二氧化碳可以抵消气候变化,但海洋酸化恢复需要数十年. 即使二氧化碳恢复到工业化前的水平后,海洋酸度仍然很高,影响海洋生态系统.
科学领域:
- 地球系统科学 地球系统科学
- 海洋学 海洋学 海洋学
- 气候科学 气候科学
背景情况:
- 人工去除二氧化碳或负排放是一种减缓气候变化的策略.
- 海洋酸化是大气二氧化碳增加的一个重要后果.
研究的目的:
- 用地球系统模型研究海洋酸化对理想化的大气二氧化碳去除场景的反应.
- 分析二氧化碳减排后海洋碳酸盐化学的恢复时间尺度.
主要方法:
- 模拟大气中的二氧化碳增加到工业化前水平的四倍.
- 模拟的二氧化碳在不同的速度下降到工业化前的水平 (每年0.5%,1%,2%).
- 利用地球系统模型跟踪海洋碳酸盐化学的变化.
主要成果:
- 表面海洋碳酸盐化学 ([H+],pH,阿拉贡石和) 迅速响应了二氧化碳的去除.
- 海洋碳酸盐化学中的季节性循环落后于大气二氧化碳的减少.
- 深海碳酸盐化学变化显示出相当大的滞后.
- 在二氧化碳恢复到工业化前水平后,整个海洋的酸度比工业化前水平高15%-18%.
结论:
- 海洋酸化恢复是一个缓慢的过程,在某些方面需要几十年到几个世纪,即使成功去除二氧化碳.
- 在大气二氧化碳减少后,海洋酸度升高和季节周期变化持续很长时间.
- 这些长期的变化对海洋生态系统的弹性产生了重大影响.
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