Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 6 6 2006 10.5194/acpd-6-11845-2006 http://www.atmos-chem-phys-discuss.net/6/11845/2006/ http://www.atmos-chem-phys-discuss.net/6/11845/2006/acpd-6-11845-2006.html http://www.atmos-chem-phys-discuss.net/6/11845/2006/acpd-6-11845-2006.pdf 11845 11875 2006-11-22 Technical Note: A new SIze REsolved Aerosol Model (SIREAM) E. Debry K. Fahey K. Sartelet B. Sportisse M. Tombette CEREA, Joint Research Laboratory, &#201;cole Nationale des Ponts et Chausseés/EDF R&D, France We briefly present in this short paper a new SIze REsolved Aerosol Model (SIREAM) which simulates the evolution of atmospheric aerosol by solving the General Dynamic Equation (GDE). SIREAM segregates the aerosol size distribution into sections and solves the GDE by splitting coagulation and condensation/evaporation. A moving sectional approach is used to describe the size distribution change due to condensation/evaporation and a hybrid method has been developed to lower the computational burden. SIREAM uses the same physical parameterizations as those used in the Modal Aerosol Model, MAM sartelet05development. It is hosted in the modeling system P<SMALL>OLYPHEMUS</SMALL> (Mallet et al., 2006) but can be linked to any other three-dimensional Chemistry-Transport Model.