Spatial Distribution and Biogeochemical Cycling of Dimethylated Sulfur Compounds and Methane in the East China Sea During Spring

Xing, Zhai; Li, Jianlong; Zhang, Honghai; Tan, Dandan; Yang, Gui‐Peng

doi:10.1029/2018jc014488

Cited by 17 publications

(10 citation statements)

References 85 publications

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“…The DMS concentrations were generally between 1.1 and 3.5 nmol L −1 , except for two small peaks of up to 9.5 nmol L −1 in areas of phytoplankton blooms near the eastern region of Hainan and the estuarine region of the Pearl River (Figure ). Our results were in agreement with those of many previous studies (Zhai et al, ; Zhang et al, ), in which high DMS levels commonly occurred in the estuaries and were related to the high phytoplankton biomass. Overall, the DMS concentrations were high in the estuarine and coastal regions and low in the central large‐scale basin.…”

Section: Resultssupporting

confidence: 94%

“…Many studies have demonstrated that the production and consumption of DMS are significantly affected by the complex web of ecological, physical, and biogeochemical processes (Asher et al, ; Kiene et al, ; Simó et al, ; Zhai et al, ). Oceanic DMS is mainly derived from the algal and bacterial metabolite of dimethylsulfoniopropionate (DMSP) (Keller, ; Todd et al, ), which is produced by phytoplankton.…”

Section: Introductionmentioning

confidence: 99%

“…Notably, high concentrations of chromophoric dissolved organic matter (CDOM) could also have a significant influence on the photochemical processes of DMS (Andreae & Crutzen, ). In recent years, much attention regarding the cycle of dimethylated sulfur compounds has focused on the shelf areas in eastern China (Yang et al, ; Zhai et al, ; Zhang et al, ). However, limited information on the biological and photolytic processes of marine DMS is available in the South China Sea (SCS) and most of this research has focused on the central basin of the SCS (Yang et al, ; Zhai et al, ).…”

Section: Introductionmentioning

confidence: 99%

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Distribution Characteristics of Dimethylated Sulfur Compounds and Turnover of Dimethylsulfide in the Northern South China Sea During Summer

Xing

Song

et al. 2020

JGR Biogeosciences

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Spatial distributions of dimethylsulfide (DMS), dimethylsulfoniopropionate (DMSP), and dimethyl sulfoxide (DMSO) in the northern South China Sea were determined in the summer of 2015. The mean concentrations of DMS, particulate DMSP (DMSPp), dissolved DMSP (DMSPd), dissolved DMSO (DMSOd), and particulate DMSO (DMSOp) in the surface seawater were 2.8 ± 1.0, 6.8 ± 1.5, 14.0 ± 3.1, 12.2 ± 3.2, and 9.2 ± 2.6 nmol L−1, respectively. The contributions of three principal removal pathways of DMS were investigated. The average biological production and consumption rates of DMS in the surface seawater were 6.15 ± 1.12 and 4.63 ± 1.32 nmol L−1 day−1. Deck incubation experiments showed that the photooxidation rates of DMS for different radiation bands followed the order: KUVB > KUVA > Kvisible light. The DMS photooxidation rates were higher in the coastal waters than in the open ocean, which might be associated with the higher concentrations of dissolved organic matter of terrigenous input. The sea‐to‐air fluxes of DMS ranged from 1.6 to 50.3 μmol m−2 day−1 with an average value of 15.6 ± 11.6 μmol m−2 day−1. Based on the respective turnover times of DMS, the contributions of biological consumption, photooxidation, and sea‐to‐air exchange to the sink of DMS were 32.6 ± 11.0%, 23.2 ± 8.9%, and 44.1 ± 19.2%, respectively, suggesting that the three removal pathways were all critical to the migration and transformation of DMS in the surface seawater during summer.

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Section: Resultssupporting

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Distribution Characteristics of Dimethylated Sulfur Compounds and Turnover of Dimethylsulfide in the Northern South China Sea During Summer

Xing

Song

et al. 2020

JGR Biogeosciences

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“…The vertical distribution of VOSCs in lakes differed significantly from that in the ocean, where the concentration of VOSCs decreased with depth [38]. Concentrations of DMS in the surface water of Yangcheng Lake were higher than those in the open sea (0.12 µg/L) and comparable to those in the offshore area (0.62 µg/L) [39][40][41].…”

Section: Compared With Other Freshwater Lakesmentioning

confidence: 81%

Distribution and Release of Volatile Organic Sulfur Compounds in Yangcheng Lake

Gong

Zhao

et al. 2022

Water

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Volatile organic sulfur compounds (VOSCs) function as a water–atmosphere link in the global sulfur cycle. It is generally believed that the vast majority of VOSCs are released from the ocean. However, due to the pervasive eutrophication and pollution of inland waters, the VOSC production and emission in rivers, lakes and reservoirs are attracting more attention. In this study, the temporal and spatial distributions of three VOSCs, including methanethiol, Dimethyl sulfide, and dimethyl disulfide in Yangcheng Lake, a eutrophic shallow lake, are investigated monthly and seasonally. Results show that VOSCs are higher in summer and autumn, with the western region as a hotspot. Our results show a positive correlation between VOSC and phytoplankton biomass (p < 0.05). Interestingly, from algal phylum composition, all the phylum, except those with low biomass, played a positive effect on VOSCs’ concentration. We did not find any specific phylum or species of cyanobacteria that contributed solely to the VOSCs. The water-air effluxes of Dimethyl sulfide (DMS) are estimated by a stagnant film model. The DMS effluxes from Yangcheng Lakes were higher than deep lakes and similar to the ocean, indicating that VOSCs, particularly DMS, in those eutrophic shallow lakes were non-negligible.

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“…The predicted high MOx rates in near-shore environments suggest that this process could serve as an important biological sink to reduce the global diffusive methane emissions from shallow waters. Furthermore, we also predicted depth profiles of MOx rates in the ECS using this model based on the previous measurements of methane concentrations and other parameters in the ECS 43 (Supplementary Table 3). The predicted depth-integrated MOx rates (22.08 ± 7.92 µmol m −2 d −1 ) were similar to the measured values, verifying the validity of our model.…”

Section: Predicted Global Mox Rates In Marine Watersmentioning

confidence: 99%

Aerobic oxidation of methane significantly reduces global diffusive methane emissions from shallow marine waters

et al. 2022

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Methane is supersaturated in surface seawater and shallow coastal waters dominate global ocean methane emissions to the atmosphere. Aerobic methane oxidation (MOx) can reduce atmospheric evasion, but the magnitude and control of MOx remain poorly understood. Here we investigate methane sources and fates in the East China Sea and map global MOx rates in shallow waters by training machine-learning models. We show methane is produced during methylphosphonate decomposition under phosphate-limiting conditions and sedimentary release is also source of methane. High MOx rates observed in these productive coastal waters are correlated with methanotrophic activity and biomass. By merging the measured MOx rates with methane concentrations and other variables from a global database, we predict MOx rates and estimate that half of methane, amounting to 1.8 ± 2.7 Tg, is consumed annually in near-shore waters (<50 m), suggesting that aerobic methanotrophy is an important sink that significantly constrains global methane emissions.

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Spatial Distribution and Biogeochemical Cycling of Dimethylated Sulfur Compounds and Methane in the East China Sea During Spring

Cited by 17 publications

References 85 publications

Distribution Characteristics of Dimethylated Sulfur Compounds and Turnover of Dimethylsulfide in the Northern South China Sea During Summer

Distribution Characteristics of Dimethylated Sulfur Compounds and Turnover of Dimethylsulfide in the Northern South China Sea During Summer

Distribution and Release of Volatile Organic Sulfur Compounds in Yangcheng Lake

Aerobic oxidation of methane significantly reduces global diffusive methane emissions from shallow marine waters

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