Total aerosol effect: radiative forcing or radiative flux perturbation?
Total aerosol effect: radiative forcing or radiative flux perturbation?
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DOI：
10.5194/acp-10-3235-2010
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发表时间：
2009-11
影响因子：
6.3
通讯作者：
U. Lohmann;L. Rotstayn;T. Storelvmo;A. Jones;S. Menon;J. Quaas;A. Ekman;D. Koch;R. Ruedy
中科院分区：
文献类型：
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作者：
U. Lohmann;L. Rotstayn;T. Storelvmo;A. Jones;S. Menon;J. Quaas;A. Ekman;D. Koch;R. Ruedy
摘要。气溶胶辐射强迫的不确定性，特别是与云有关的不确定性，在很大程度上导致了总人为强迫的不确定性。气溶胶与云和辐射的相互作用会产生反馈，从而影响降水的形成速率。在以前对气溶胶辐射强迫的评估中，没有对这些影响进行量化。此外，由于全球气溶胶-气候模式相互模拟气溶胶和云的微物理特性，很难用传统的方法对气溶胶强迫进行量化。在这里，我们认为应该包括快速反馈，因为与全球变暖的时间尺度相比，它们的反应速度很快。我们表明，对于不同的强迫因子（气溶胶和温室气体），传统定义的辐射强迫与一种将这些快速反馈和相互作用考虑在内的方法（这里称为辐射通量摄动（RFP））的估计相当吻合。基于我们的结果，我们推荐RFP作为比较不同强迫因子的有效选项，并比较不同模型中特定强迫因子的影响。
Abstract. Uncertainties in aerosol radiative forcings, especially those associated with clouds, contribute to a large extent to uncertainties in the total anthropogenic forcing. The interaction of aerosols with clouds and radiation introduces feedbacks which can affect the rate of precipitation formation. In former assessments of aerosol radiative forcings, these effects have not been quantified. Also, with global aerosol-climate models simulating interactively aerosols and cloud microphysical properties, a quantification of the aerosol forcings in the traditional way is difficult to define properly. Here we argue that fast feedbacks should be included because they act quickly compared with the time scale of global warming. We show that for different forcing agents (aerosols and greenhouse gases) the radiative forcings as traditionally defined agree rather well with estimates from a method, here referred to as radiative flux perturbations (RFP), that takes these fast feedbacks and interactions into account. Based on our results, we recommend RFP as a valid option to compare different forcing agents, and to compare the effects of particular forcing agents in different models.