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Adjusted radiative forcing and global radiative feedbacks in CNRM-CM5, a closure of the partial decomposition

机译：CNRM-CM5中的调整辐射强迫和全局辐射反馈，部分分解的结束

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摘要

This study provides a comprehensive global analysis of the climate radiative feedbacks and the adjusted radiative forcing for a CO_2 increase perturbation in the CNRM-CM5 climate model using the partial radiative perturbations (PRP) method. Some methodological key points of the PRP are investigated, with a particular focus on the consideration of the effect of fast adjustments. First, the standard PRP method is applied by neglecting certain fast adjustments. The effect of the field decorrelation is highlighted by performing a PRP across two different periods of a control experiment and by analyzing second-order terms. Sensitivity tests to the field substitution frequency, the sampling period and the perturbed experiment used are performed. The impact of the definition of the top of the climate system (top-of-the-atmosphere or tropo-pause) in the feedback estimate is also discussed. Secondly, the fast adjustment processes are taken into account by combining the PRP framework with the method of linear regression of the partial net radiative flux change against the mean surface air temperature change using a step forcing experiment. This method allows us to quantify the contribution of the different constituents to the forcing adjustment and to improve the estimation of the radiative feedbacks. It is shown that such decomposition allows the retrieval of the adjusted radiative forcing, the radiative feedbacks and the climate sensitivity as estimated with the linear regression method with a high level of accuracy, validating the partial decomposition.
机译：这项研究使用部分辐射扰动（PRP）方法对CNRM-CM5气候模型中的气候辐射反馈和CO_2增加扰动的调整辐射强迫进行了全面的全球分析。研究了PRP的一些方法论要点，尤其着眼于快速调整效果的考虑。首先，通过忽略某些快速调整来应用标准PRP方法。通过在控制实验的两个不同阶段执行PRP并分析二阶项，可以突出显示场解相关的效果。进行了对场替代频率，采样周期和所用扰动实验的敏感性测试。还讨论了气候系统顶部（大气顶部或对流暂停）的定义对反馈估计的影响。其次，通过分步强迫实验，通过将PRP框架与部分净辐射通量变化相对于平均地表气温变化的线性回归方法相结合，考虑了快速调节过程。这种方法使我们能够量化不同成分对强迫调整的贡献，并改善对辐射反馈的估计。结果表明，这种分解允许以线性回归方法以较高的准确性检索调整后的辐射强迫，辐射反馈和气候敏感性，从而验证了部分分解。

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