How to turn off the thermal response to condensation latent heat release in CAM5.1

[dengjiechun@outlook_com]

Hi everyone,    I'm runing CAM5.1 stand alone via CESM1.0.3 with the compset FC5. I'd like to investigate the direct and indirect effects of aerosols. However,when condensation latent heat release induced by precipitation is taken into accout, not only aerosols but also condensation heating is responsible for T-tendency. So I really need to know how to turn off the T-tendency to condensation latent heating in CAM5.1 in order to reflect a really thermal response to aerosols. Should I modify somewhere in atmophere models and how? I'm trapped here and feeling confused for a long time.Thanks for suggestion and any help! I'll appreacite a lot!Jason

 

[andrew]

Dear Jason,Shutting off the temperature tendency due to the moist processes is going tbe produce a climate that is very different than earth, so I a not sure what you will learn from that. OAS a result, the model is not designed to do thiscanon can shut them off with an idealized physics option. If you try to do it with the code, there is no 'switch' and you will have difficily maintaining energy balance.typically, the effects of aerosols are measured by a radiative forcing, in terms of Wm-2: you could more easily generate the heating tendency terms due to aerosols, and use this to infer temperature tendency from aerosols. The way to do that is to set up a diagnostic call to the radiation code that does not include aerosols in the name list, and output shortwave and longwave heating profiles from the diagnostic and prognostic calls to the aerosols: the difference would be the thermal effect of aerosols.the aerosoI-radiation interface should be described in the cam documentation.  Hope that helps.Andrew