碳系统状态决定了排放的变暖潜力
Alexander J Winkler1,2, Ranga Myneni3, Christian Reimers1
1Max-Planck-Institute for Biogeochemistry, Jena, Germany.
PloS one
|August 1, 2024
概括
碳排放的时间显著影响未来的变暖,挑战了累积排放和温度上升之间的简单线性关系的假设. 这突显了气候预测中的不确定性和需要精细的地球系统模型.
科学领域:
- 气候科学 气候科学
- 地球系统科学 地球系统科学
- 碳循环研究 碳循环研究
背景情况:
- 目前的气候战略依赖于基于排放和地表变暖之间的近线性关系来限制累积碳排放.
- 这种关系是IPCC评估的基石,用于为1.5°C或2°C变暖等目标设定排放预算.
研究的目的:
- 使用先进的地球系统模型 (ESM) 测试累积碳排放和表面变暖之间的比例假设.
- 调查排放时间对气候系统反应的影响,特别是对累积碳排放的过渡性气候反应 (TCRE).
主要方法:
- 利用专门设计的模拟,使用最新一代的ESM,具有交互式碳循环和更新的地面过程.
- 分析了一套合模型对比项目 (CMIP) 模拟,包括 ZecMIP 和 ScenarioMIP.
主要成果:
- 发现大气中的二氧化碳度和表面变暖可以在相同的累积碳排放中显著变化 (分别高达~100 ppmv和~0.31°C).
- 证明TCRE不仅取决于总排放量,还取决于这些排放的时间,这是以前被忽视的因素.
- 确定了海洋和陆地的滞后碳捕集过程是这种时间依赖的关键驱动因素.
结论:
- 既定的TCRE概念并没有从根本上被取消,但它受到与碳系统不断变化的状态相关的额外不确定性的约束.
- 准确的未来排放影响预测需要通过观察和精确的ESM更好地了解碳系统状态的依赖性.
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