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

Dimethylsulfide (DMS) and very short-lived bromocarbons (VSL^Br) 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 VSL^Br 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 VSL^Brvalues. 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 <i>a</i> (Chl-<i>a</i>) and DMS. However, the responses of VSL^Br 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.

二甲基硫（Dimethylsulfide，DMS）与短寿命溴代烃（very short-lived bromocarbons，VSL^Br）是海洋排放的重要痕量气体，可对全球气候产生影响。本研究开展甲板培养实验，旨在探究大气气溶胶沉降与酸处理气溶胶沉降对贫营养西太平洋海域中二甲基硫（DMS）及4种短寿命溴代烃——三溴甲烷（bromoform，CHBr₃）、二溴甲烷（dibromomethane，CH₂Br₂）、二溴一氯甲烷（dibromochloromethane，CHBr₂Cl）与一溴二氯甲烷（bromodichloromethane，CHBrCl₂）——生成过程的影响。实验结果表明，大气气溶胶沉降可显著提升DMS与4种VSL^Br的浓度水平。此外，气溶胶输入会提高高DMS产生物种的丰度，尤以甲藻（dinoflagellates）为甚。相较而言，酸处理气溶胶实验组对叶绿素a（Chlorophyll a，Chl-a）与DMS的影响更为显著；但VSL^Br对酸处理气溶胶的响应更为复杂：尽管三溴甲烷与二溴甲烷的平均浓度在气溶胶沉降组与酸处理气溶胶沉降组间无显著差异，但二溴一氯甲烷与一溴二氯甲烷的生成在酸处理气溶胶实验组中受到抑制。