Sensitivity of an Earth system climate model to idealized radiative forcing
Sensitivity of an Earth system climate model to idealized radiative forcing
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地球系统气候模型对理想辐射强迫的敏感性
DOI：
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发表时间：
2012
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影响因子：
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通讯作者：
W. Collins
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作者：
T. Andrews;M. Ringer;M. Doutriaux;M. Webb;W. Collins
我们诊断强迫和气候反馈的基准敏感性实验与新的气象局哈德利中心地球系统气候模型HadGEM 2-ES。为了确定新纳入的地球物理和化学过程的影响，将结果与关闭这些过程以及与地球化学的不同耦合进行的一组平行实验进行比较。在二氧化碳突然翻两番的实验中，我们发现，包括这些过程并没有改变全球气候敏感性的模式。然而，当二氧化碳的变化与植被解耦时，或者当模式受到非二氧化碳强迫时-太阳常数增加-新的反馈出现，使气候系统对外部扰动不那么敏感。我们确定了一个强大的负灰尘植被对气候变化的反馈，这是小的标准二氧化碳敏感性实验，由于在这个模型中的二氧化碳对植物的生理/施肥效应。
We diagnose forcing and climate feedbacks in benchmark sensitivity experiments with the new Met Office Hadley Centre Earth system climate model HadGEM2‐ES. To identify the impact of newly‐included biogeophysical and chemical processes, results are compared to a parallel set of experiments performed with these processes switched off, and different couplings with the biogeochemistry. In abrupt carbon dioxide quadrupling experiments we find that the inclusion of these processes does not alter the global climate sensitivity of the model. However, when the change in carbon dioxide is uncoupled from the vegetation, or when the model is forced with a non‐carbon dioxide forcing – an increase in solar constant – new feedbacks emerge that make the climate system less sensitive to external perturbations. We identify a strong negative dust‐vegetation feedback on climate change that is small in standard carbon dioxide sensitivity experiments due to the physiological/fertilization effects of carbon dioxide on plants in this model.