中国海洋大学学报（自然科学版）2024，Vol.54Issue(6)：108-120,13.DOI:10.16441/j.cnki.hdxb.20230082
冬、夏季长江口海域二甲基硫化物的时空分布及对海水酸化和铁添加的响应
Spatiotemporal Distribution of Biogenic Dimethylated Sulfur Compounds in the Yangtze(Changjiang)River Estuary and Its Adjacent Area During Summer and Winter and Their Response to Ocean Acidification and Fe Addition
摘要
Abstract
The concentrations of dimethylsulfide(DMS)and dimethylsulfoniopropionate(DMSP)in the surface seawater and important vertical sections of Changjiang River Estuary and its adjacent area were measured during two cruises in February 2022 and July 2022.The migration and conversion rate of DMS were comprehensively evaluated based on DMS production rate,consumption rate,and dissolved DMSP(DMSPd)degradation rate.Ship-based incubation experiments were conducted to explore the re-sponse of dimethyl sulfide to seawater acidification and Fe addition.The results showed that the mean concentrations of DMS,DMSPd and DMSPp in winter were(1.55±0.96)、(3.55±2.38)and(4.42±3.11)nmol·L-1,respectively,while those in summer were(8.45±5.76),(18.90±6.86)and(22.41±15.99)nmol·L-1.In winter and summer,the high DMS concentrations in the Changjiang Estuary mainly appeared in the open sea,and the dimethyl sulfide concentrations showed a gradual decrease from surface to bottom in the vertical direction.The DMS sea-air fluxes in winter and summer were 2.23 and 22.96 μmol·m-2·d-1.The conversion rates of DMSPd and the biological yields of DMS were higher in summer than in winter.Microbial consumption is main removal pathway of DMS in the Yangtze Riv-er Estuary.Ship-based incubation experiments showed that OA inhibited the production of DMS and DMSP when p H was 7.7 and 7.9.The addition of Fe promoted releases of DMS and DMSP.Therefore,the future acidification of seawater and Fe input will have an important influence on the biogeochemical cycle of DMS in the Changjiang Estuary.关键词
二甲基硫/二甲基巯基丙酸内盐/时空分布/生产消费/海气通量/海水酸化/长江口Key words
dimethylsulfide/dimethylsulfoniopropionate/temporal and spatial distribution/produc-tion and consumption/sea-air flux/ocean acidification(OA)/the Yangtze River Estuary分类
海洋科学引用本文复制引用
孙茂祥,于娟,杨桂朋..冬、夏季长江口海域二甲基硫化物的时空分布及对海水酸化和铁添加的响应[J].中国海洋大学学报（自然科学版）,2024,54(6):108-120,13.基金项目
国家自然科学基金项目(41976038) （41976038）
国家重点研究发展计划项目(2016YFA0601301)资助 Supported by the National Natural Science Foundation of China(41976038) （2016YFA0601301）
the National Key Research and Development Program(2016YFA0601301) （2016YFA0601301）
