This WP integrates the whole research from nano and local scales up to regional and global scales. A major enterprise conducted at the international level is the development of complex Earth System Models (ESM). Such models integrate our knowledge regarding the atmosphere, ocean, cryosphere and biosphere, accounting for the couplings between physical and biogeochemical processes in these components of the Earth System. We can provide unique data and detailed information especially from boreal regions to ESMs. However, ESMs are numerically highly demanding, and the modelling of aerosol processes must be simplified before they can be included. An important part of our strategy is therefore to explore the impact of new emissions and processes in a sophisticated offline global aerosol model (GLOMAP) in collaboration with Leeds. In the other WPs, we concentrate on obtaining results from processes that are not yet fully understood, and have therefore not been implemented in integrated models. We are a part of COSMOS, a new project for community ESM, led by the Max Planck Institute in Hamburg. The activities are strongly linked to those in the Integrated EU Project EUCAARI (co-ordinated by M. Kulmala, active in 2007-2010). The most novel (beyond EUCAARI) aspect of this project is to couple the biogenic aerosol production with a global aerosol dynamics model for the first time, in the context of global Earth System Modelling. In this WP, we will answer the following questions:
How does atmospheric new particle formation affect the global aerosol load and radiative forcing?
What fractions of freshly-formed aerosol particles can be stated to be biogenic and anthropogenic, or can this distinction be made at all?
How will these particles influence human health and air quality?
How has the role of biogenic freshly-formed aerosol particles changed from pre-industrial time to the present, and how will it change in the future, e.g. by 2100?
How to combine the results obtained during this project to find out the past, present and future role of biogenic freshly-formed aerosol particles?