H2O Windows and CO2 Radiator Fins: A Clear‐Sky Explanation for the Peak in Equilibrium Climate Sensitivity

H2O Windows and CO2 Radiator Fins: A Clear‐Sky Explanation for the Peak in Equilibrium Climate Sensitivity
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H2O 窗户和 CO2 散热器翅片:对平衡气候敏感性峰值的晴空解释

DOI:
10.1029/2020gl089609
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发表时间:
2021
影响因子:
5.2
通讯作者:
N. Jeevanjee
N. Jeevanjee
中科院分区:
地球科学1区
文献类型:
--
作者:
J. Seeley;N. Jeevanjee

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最近对地球平衡气候敏感性(ECS)的状态依赖性的探索揭示了ECS在表面温度为10310 K时的明显峰值。在跨越模型层次的模型中观察到了这个ECS峰值,这表明了一个强大的物理源。在这里,我们提出了一个解释这个ECS峰值使用一种新的光谱分辨分解晴空长波反馈。我们发现,长波光谱中以H2O为主和以CO2为主的部分中的光谱反馈之间的相互作用,沿着对流层上部变暖的湿绝热放大,共同产生反馈参数的最小值,以及ECS中的相应峰值,表面温度为310 K。机制否认测试强调了ECS峰值的三个关键因素:(1)H2O连续吸收,以在高表面温度下快速关闭光谱窗口;(2)湿绝热对流层温度,以增强对流层上层变暖;(3)CO2随表面温度的积极一致增加。
Recent explorations of the state‐dependence of Earth’s equilibrium climate sensitivity (ECS) have revealed a pronounced peak in ECS at a surface temperature of ∼310 K. This ECS peak has been observed in models spanning the model hierarchy, suggesting a robust physical source. Here, we propose an explanation for this ECS peak using a novel spectrally resolved decomposition of clear‐sky longwave feedbacks. We show that the interplay between spectral feedbacks in H2O‐dominated and CO2‐dominated portions of the longwave spectrum, along with moist‐adiabatic amplification of upper‐tropospheric warming, conspire to produce a minimum in the feedback parameter, and a corresponding peak in ECS, at a surface temperature of 310 K. Mechanism‐denial tests highlight three key ingredients for the ECS peak: (1) H2O continuum absorption to quickly close spectral windows at high surface temperature; (2) moist‐adiabatic tropospheric temperatures to enhance upper‐tropospheric warming; and (3) energetically consistent increases of CO2 with surface temperature.
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发表时间: 2013-11-01
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