Technical Note: Simulation of detailed aerosol chemistry on the global scale using MECCA-AERO

[摘要] We present the MESSy submodel MECCA-AERO, which simulates bothaerosol and gas phase chemistry within one comprehensive mechanism.Including the aerosol phase into the chemistry mechanism increases thestiffness of the resulting set of differential equations.The numerical aspects of the approach followed in MECCA-AERO are presented.

MECCA-AERO requires input of an aerosol dynamical/microphysical model toprovide the aerosol size and particle number information of the modes/bins forwhich the chemistry is explicitly calculated.Additional precautions are required to avoid the double counting of processes,especially for sulphate in the aerosol dynamical and the chemistry model.This coupling is explained in detail.

To illustrate the capabilities of the new aerosol submodel, examples forspecies usuallytreated in aerosol dynamical models are shown.The aerosol chemistry as provided by MECCA-AERO is very sumptuous and notreadily applicable for long-term simulations, though it provides a referenceto evaluate simplified approaches.

[学科分类] 大气科学