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A new aerosol microphysical module MATRIX, the MulticonfigurationAerosol TRacker of mIXing state, and its application in the Goddard Institutefor Space Studies (GISS) climate model (ModelE) are described. This module,which is based on the quadrature method of moments (QMOM), representsnucleation, condensation, coagulation, internal and external mixing, andcloud-drop activation and provides aerosol particle mass and numberconcentration and particle size information for up to 16 mixed-mode aerosolpopulations. Internal and external mixing among aerosol components sulfate,nitrate, ammonium, carbonaceous aerosols, dust and sea-salt particles arerepresented. The solubility of each aerosol population, which is explicitlycalculated based on its soluble and insoluble components, enables calculationof the dependence of cloud drop activation on the microphysicalcharacterization of multiple soluble aerosol populations.  A detailed model description and results of box-model simulations of variousaerosol population configurations are presented. The box model experimentsdemonstrate the dependence of cloud activating aerosol number concentrationon the aerosol population configuration; comparisons to sectional models arequite favorable. MATRIX is incorporated into the GISS climate model andsimulations are carried out primarily to assess its performance/efficiencyfor global-scale atmospheric model application. Simulation results werecompared with aircraft and station measurements of aerosol mass and numberconcentration and particle size to assess the ability of the new method toyield data suitable for such comparison.The model accurately captures the observed size distributions in the Aitkenand accumulation modes up to particle diameter 1 μm, in which sulfate,nitrate, black and organic carbon are predominantly located; however themodel underestimates coarse-mode number concentration and size, especially inthe marine environment. This is more likely due to oversimplifications of therepresentation of sea salt emissions – sea salt emissions are only calculatedfor two size classes – than to inherent limitations of MATRIX

MATRIX (Multiconfiguration Aerosol TRacker of mIXing state): an aerosol microphysical module for global atmospheric models