Responses of biogenic active gases to the atmospheric deposition with acid-processed in the oligotrophic western Pacific Ocean

Dimethylsulfide (DMS) and very short-lived bromocarbons (VSLBr) are important trace gases emitted from oceans that can affect global climate. The deck incubation experiment was conducted to explore the impacts of atmospheric aerosol deposition and acid-processed aerosol deposition in determining production of DMS, and four VSLBr including bromoform (CHBr3), dibromomethane (CH2Br2), dibromochloromethane (CHBr2Cl), and bromodichloromethane (CHBrCl2) in the oligotrophic western Pacific Ocean. The experiment revealed that atmospheric aerosol deposition significantly elevated DMS and four VSLBr values. Furthermore, introducing aerosols led to a rise in the abundance of high DMS producers, specifically dinoflagellates. In comparison, the acid aerosol treatment had a more pronounced effect on Chlorophyll a (Chl-a) and DMS. However, the responses of VSLBr to the acid aerosol treatment were more complex. While the average CHBr3 and CH2Br2 values showed no significant variations between aerosol and acid aerosol treatments, the production of CHBr2Cl and CHBrCl2 was inhibited in the acid aerosol treatment.