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FRINAT-Matematikk og naturvitenskap

Aerosol/gas-phase chemistry and microphysics in global models

Awarded: NOK 1.7 mill.

Aerosols of natural and anthropogenic origin have environmental impacts through health effects, climate forcing, modification of the hydrological cycle, and reduced visibility. The objective of this project is to improve and validate a coupled aerosol/gas -phase model for the processing and distribution of aerosols in the troposphere. Over the last few years modules for the main aerosols have been included in the University of Oslo global chemistry/transport model (OsloCTM2). Through observations and labor atory experiments the importance of interactions between the gas phase chemistry and the aerosols as well as interactions between different types of aerosols has been identified. Through this the need to link gas phase photochemistry and aerosols and to i nclude aerosol microphysics in global models has become evident. In the first phase of the project (WP1 and WP2) existing published parameterizations of gas-phase/aerosol and aerosol/aerosol interaction, and a microphysical module will be implemented and tested in OsloCTM2. The microphysical module will provide a size distribution of the aerosol population and a consistent partitioning in externally and internally mixed (soluble) aerosols which determine the aging and ultimately the wet deposition of the aerosols. The third phase will develop a tool which simulates in as much detail as possible the aerosol size distribution. Together with observational data this tool will be used to validate the parameterizations used in WP1 and WP2, and to carry out deta iled process studies. The results of the project will provide significant added value to other projects using the OsloCTM2 (e.g. QUANTIFY (EU) at UiO and the project "Climate effects of reducing black carbon emissions" at CICERO/UiO/NPI, (Norwegian Resear ch Council)). To be attractive for participation in future EU and national projects, it is of key importance that the OsloCTM2 is developed according to state of the scientific knowledge in aerosol science.

Funding scheme:

FRINAT-Matematikk og naturvitenskap