Dear all. There is a queatsion about aerosol bothered me. In the CAM4.0 and the previous version of CAM, the aerosols are prescribed, meaning that the model doesn't include the interaction between aerosol and cloud, and the aerosol chemsitry. IPCC AR5 reported that the radiative focing of the aerosol-cloud interactions is larger than the radiative forcing of aersol-radiative interactions. So, in the CAM4.0 and the previous version of CAM, whether the radiative forcing of aerosols will be underestimated? And in this situation, how does the the model represent the climate change well?
If CAM model simulations use prescribed aerosol data, it means that these simulations do not consider the impact of atmosphere on aerosol, but include the impact of aerosol on atmosphere (cloud and radiation). Note that the prescribed aerosol data used in CAM model considers the impact of atmosphere on aerosol. Therefore, it's hard to say the radiative forcing of aerosols is underestimated because the aerosols are prescribed in the model.
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