Inderscience Publishers

Modelling the influence of dimethyl sulphide on aerosol production in the marine boundary layer

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It has been postulated that dimethyl sulphide (DMS) emissions from the oceans can produce new condensation nuclei and eventually cloud condensation nuclei. Thus, DMS may have a significant influence on the Earth's radiation budget. A study of this postulate has been conducted for marine boundary layer conditions using a newly developed chemistry–aerosol–cloud (CAC) modelling system. The CAC modelling system is a variable heterogeneous chemistry model including aerosol physics using the modal concept. A series of simulations describing the clean marine atmosphere with variations of DMS emissions are presented. These simulations show that DMS can increase the particle number concentration of non sea-salt sulphate in accumulation mode from 10% to 25% under clean marine atmospheric conditions, and the total production of accumulation mode particles from 5% to 15%. Furthermore, the importance of including a DMS loss to the liquid-phase aerosols is shown. If this link is not included then the number of particles in the accumulation mode can be increased by a factor up to 8.

Keywords: aerosols, atmospheric boundary layer, dimethyl sulphide emissions, marine atmosphere, modelling, radiation, simulation, DMS, surface water, marine conditions

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