CAM-chem: description and evaluation of interactive atmospheric chemistry in CESM

The paper gives an overview of the atmospheric chemistry component of the Community Atmosphere Model (CAM-Chem). The paper consist of two parts: (i) an overview of the chemical schemes and the chemistry-specific parameterisations and (ii) a comprehensive evaluation of the performance of CAM-Chem. For the evaluation CAMCHem is compared against ozone-sondes, ozone-total columns retrievals, air-craftobservations from INTEX A & B and global surface CO and aerosol measurements. The evaluation is carried out for three different model configuration, which use either on-line simulated meteorological data or off-line data from the GEOS-5 and MERRA C1043

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