The spatial distributions of dimethylsulfide (DMS), dimethylsulfoniopropionate (DMSP), and dimethylsulfoxide (DMSO) were investigated in the Yangtze River Estuary from 9 to 23 March, 2018. The average concentrations of DMS, dissolved DMSP (DMSPd), particulate DMSP (DMSPp), dissolved DMSO (DMSOd) and particulate DMSO (DMSOp) were 3.00 ± 2.53, 1.75 ± 1.08, 10.89 ± 14.28, 9.80 ± 7.79, and 9.51 ± 8.90 nmol L⁻¹, respectively. The high DMS and DMSP concentrations occurred mainly in the open sea, exhibiting distribution patterns similar to chlorophyll a (Chl‐a). Due to the release of resuspended sediments, elevated DMSO concentrations were observed in the bottom waters of some stations. The three sulfur compounds were positively correlated with Chl‐a (p < 0.05), suggesting that phytoplankton played an essential role in the production of sulfur compounds. Comparisons with previous research showed that the concentrations of DMS, DMSP, and DMSOp exhibited clear seasonal variability. The average sea‐to‐air flux of DMS was 8.19 ± 12.94 μmol m⁻² d⁻¹ in the study area, indicating that the estuary and continental shelf sea were significant contributors to the global sulfur cycle. Ship‐based incubation experiments showed that lower pH inhibited the production of the three biogenic sulfur compounds, while the addition of dust promoted their release. Therefore, in the future, the inhibitory effect of seawater acidification on the production of phytoplankton and sulfur compounds might be offset, to some degree, by the input of nutrient‐rich dust.

中文翻译：

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长江口生物硫化合物的春季空间分布及其对海水酸化和扬尘的响应

于2018年3月9日至23日在长江口调查了二甲基硫醚（DMS），丙酸二甲基磺丙酯（DMSP）和二甲基亚砜（DMSO）的空间分布。DMS的平均浓度，溶解DMSP（DMSPd），颗粒DMSP（DMSPp ），溶解的DMSO（DMSOd）和颗粒DMSO（DMSOp）分别为3.00±2.53、1.75±1.08、10.89±14.28、9.80±7.79和9.51±8.90 nmol L ^-1。高DMS和DMSP浓度主要发生在公海，其分布模式与叶绿素a（Chl- a）相似。由于释放出重悬的沉积物，在某些站的底部水域观察到DMSO浓度升高。三种硫化合物呈正相关Chl-一个（p  <0.05），表明浮游植物在硫化合物的生产中起着至关重要的作用。与先前研究的比较表明，DMS，DMSP和DMSOp的浓度表现出明显的季节性变化。DMS的平均海空通量为8.19±12.94μmolm ^-2  d ^-1在研究区的研究表明，河口和大陆架海是全球硫循环的重要贡献者。基于船的培养实验表明，较低的pH值会抑制三种生物硫化合物的产生，而添加灰尘会促进其释放。因此，在将来，海水酸化对浮游植物和含硫化合物产生的抑制作用可能会在一定程度上被营养丰富的粉尘输入所抵消。