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过去的快速变暖作为温室气体气候反的限制
Mengmeng Liu1, Iain Colin Prentice1,2,3, Laurie Menviel4
1Department of Life Sciences, Imperial College London, London, UK.
概括
通过研究过去的快速气候变化,可以减少温室气体气候反的不确定性. 过去的变暖事件揭示了二氧化碳 (CO2),甲 (CH4) 和氧化 (N2O) 的百年级反强度.
科学领域:
- 古气候学 古气候学
- 气候科学 气候科学
- 地球系统科学 地球系统科学
背景情况:
- 估计温室气体气候反是具有挑战性的,因为观测的局限性和模型的差异.
- 过去的快速气候变化,如丹斯加德-奥什格事件,为气候反机制提供了宝贵的见解.
- 这些过去的事件反映了当前和未来变暖的速度和程度.
研究的目的:
- 量化关键温室气体 (CO2,CH4,N2O) 的百年级反强度.
- 使用古气候数据作为气候反估计的约束.
- 评估现有的气候反估计的现实性.
主要方法:
- 使用冰芯记录来确定过去的温室气体度 (CO2,CH4,N2O).
- 采用了低分辨率的气候模型,由温室气体所观察到的辐射强迫而强迫.
- 在Dansgaard-Oeschger事件期间与温室气体辐射强迫相关的全球平均温度变化.
主要成果:
- 推导的反估计:CO2 (0.155 ± 0.035 W m−2 K−1),CH4 (0.114 ± 0.013 W m−2 K−1),和N2O (0.106 ± 0.026 W m−2 K−1).这些是二氧化碳.
- 证明过去的快速变暖事件对反强度提供了强大的约束.
- 指出,一些先前发表的反估计,特别是对于二氧化碳,可能是不现实的.
结论:
- 来自快速变暖事件的古气候数据显著改进了温室气体气候反的估计.
- 由此得出的反强度表明,CO2,CH4和N2O的实际值范围更为狭窄.
- 这项研究为未来气候预测相关的气候反提供了更受约束的理解.
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