Transformation processes of biogenic dimethylated sulfur compounds in the northwestern Pacific continental sea
Transformation processes of biogenic dimethylated sulfur compounds in the northwestern Pacific continental sea
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DOI：
10.1002/lno.12044
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发表时间：
2022-02
影响因子：
4.5
通讯作者：
Qian‐Yao Ma;Hong‐Hai Zhang;Feng Xu;Gui‐Peng Yang
中科院分区：
文献类型：
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作者：
Qian‐Yao Ma;Hong‐Hai Zhang;Feng Xu;Gui‐Peng Yang
生物源性二甲基化硫化合物包括二甲基硫醚（DMS）、二甲基磺酰丙酸（DMSP）和二甲基亚砜，它们在海洋藻类的生理代谢过程、气候调节和全球硫循环中发挥着重要作用，但每种转化途径的贡献及其控制因素仍不确定。2017年3月27日至4月15日，首次同时测量了中国东海海气界面和海水-沉积物界面生物源二甲基化硫化合物主要转化途径速率和DMS通量。总DMSP （0.53 d）、溶解DMSP （0.29 d）和DMS （0.43 d）的生物更新速度较快，表明DMS和DMSP每天更新2次以上。细菌消耗占DMSP总损失的近50%，其中约38%转化为DMS。微生物消耗、光解和通风分别占DMS去除过程的56%、34%和10%。沉积物的DMS通量虽小但为正，这使得沉积物-海水界面成为水体中DMS的微小来源。最后，虽然只有约10%的DMS被排放到大气中，但研究区域被确定为大气DMS的“热点”。本研究建立的混合层DMS收支模型对陆架海洋有机硫循环提供了系统、全面的认识。
Biogenic dimethylated sulfur compounds, comprising dimethylsulfide (DMS), dimethylsulfoniopropionate (DMSP), and dimethylsulfoxide, play a vital role in the physiological metabolism processes of marine algae, climate regulation, and global sulfur cycles, but the contribution of each transformation pathway and the factors that control them remain uncertain. For the first time, from 27 March 2017 to 15 April 2017, the rates of major transformation pathways of biogenic dimethylated sulfur compounds and the fluxes of DMS at the sea–air and seawater–sediment interfaces were measured simultaneously in the East China Continental Sea. Rapid biological turnover times of total DMSP (0.53 d), dissolved DMSP (0.29 d), and DMS (0.43 d) were observed, indicating that DMS and DMSP were renewed more than twice daily. Bacterial consumption contributed nearly 50% of the total DMSP loss, approximately 38% of which was converted into DMS. Microbial consumption, photolysis, and ventilation accounted for 56%, 34%, and 10% of DMS removal processes, respectively. Sediment had a small but positive flux of DMS, making the sediment‐seawater interface a tiny source of DMS to the water column. Finally, although only about 10% of DMS was emitted to the atmosphere, the study region was identified as a “hotspot” for atmospheric DMS. The DMS budget model of the mixed layer developed in this study has provided a systematic and comprehensive understanding of the organosulfur cycle in continental shelf seas.