Marine dimethylsulfide (DMS) emissions exert a pivotal control on climate regulation via aerosol formation. Nevertheless, the biogeochemical cycle of DMS under seawater acidification remains poorly understood. Here we present integrated biogeochemical analyses that combine field observations, historical datasets, process-based modeling, and ship-based incubation experiments to elucidate pH-dependent regulatory mechanisms governing the cycling of DMS and its precursor dimethylsulfoniopropionate (DMSP) across the northwestern Pacific marginal seas. Our findings identify pH as the key driver of DMS spatial variability; moreover, DMS removal processes are highly sensitive to pH. Structural equation modeling reveals pH-driven cascading impacts on DMS mediated by dinoflagellate biomass. Incubation experiments further demonstrate that decreasing pH reduces high DMSP-producer abundance and suppresses both DMS biological production and removal rates, collectively inhibiting net DMS accumulation. These findings indicate that seawater acidification under the high-emission SSP5-8.5 scenario will reduce global marginal seas DMS emissions by 35%–66% by 2100, which may intensity regional and global warming. Our research provides new insights into the feedback mechanisms linking marine sulfur biogeochemical cycles and global climate change.
Gao X., Zhang S., Mao S., Li C., Liu Q., Zhang L., He Z., Zhang J., Liu C., Zhuang G. & Yang G., in press. Anthropogenic CO2-induced seawater acidification suppressed dimethylsulfide emissions in the northwestern Pacific marginal seas. Science China Earth Sciences. Article.
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