Secondary organic aerosol representation in global models
Kostas Tsigaridis

In order to include Secondary Organic Aerosols (SOA) in global 
atmospheric models, an independent aerosol module has been 
developed, which takes into account the SOA production from both 
biogenic and anthropogenic precursors. This module is suitable to 
simulate aerosol production in both clean and polluted environments. 
Various configurations exist, with different degrees of complexity; from 
very simple ones, with the minimum number of species for models where 
CPU time and memory are vital, to configurations with more species and 
processes included, for models that either demand a detailed 
representation of SOA, or have the ability to tolerate the computational 
resources required for them.

Results from the SOA modeling for the present time will be presented, 
focusing on the effect of the degree of complexity of the aerosol module 
on the results. The need of convergence between models and 
measurements will be demonstrated. The future development 
requirements for SOA calculations will be presented.