Study On Dry Deposition Model Of Atmospheric Aerosol And Dry Deposition Fluxes Of Elements Loaded On Aerosol To The Sea Near Qingdao Area

Atmospheric aerosol is a system consists of atmosphere and the solid and liquid particles suspended in it. Although aerosol particle is a small quantity of components in atmosphere, it has important impact on environment and human health, climate change, oceanic and terrestrial ecosystem. With the rapid development of society and economy, the magnitude of anthropogenic aerosol is explosively increasing. It is of great importance to study dry deposition of aerosol and the impacts to marine environment of aerosol particles and elements loaded on them.Based on the work of improvement of growth effect of particles under high humidity in Williams model, we reasonably improved the broken surface transfer coefficient and broken surface proportional coefficient. We also investigated the effects of the broken surface transfer, broken surface proportional coefficient and roughness length on velocity of paticles with different diamters. The parameterization has also been evaluated using other deposition model and reference data. The evaluation results showed that: the improvement is reasonable and the modified model is more applicable to calculate the dry deposition velocity of particles to natural sea water surface.Using the meteorological data offered by Tuandao observatory and water temperature offered by Xiaomaidao observation station, we obtained the seasonal variation of dry deposition velocity of particles in coastal Qingdao area and the dry deposition fluxes of elements loaded on size-segregated and total suspended particles(TSP).The results are listed as following.The monthly variation of deposition velocity is small. The averaged minimum and maximum is 6.480cm/s and 6.583cm/s, respectively. As far as the seasonal variation is concerned, the winter deposition velocity is the largest, next being that of...