Methane in the Yellow Sea and East China Sea: dynamics, distribution, and production

Ye, Wangwang; Du, Guanxiang; Zhang, Honghai; Gui-ling, Zhang

doi:10.1007/s00343-021-1010-4

Cited by 4 publications

(4 citation statements)

References 88 publications

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“…Dissolved methane concentrations have been documented intensively (Bange et al., 1994; Borges et al., 2016; Damm et al., 2015). Our results are comparable with those previously found in the coastal waters of the Yellow Sea and East China Sea (10.9 nmol L −1 ) (Ye et al., 2021) and in the north Baltic Sea (12 nmol L −1 ) (Humborg et al., 2019). Huge loadings of dissolved CH 4 in fresh waters, typically on the order of 100 nM or more, have been reported in global rivers (i.e., the Yangze River, the Mississippi river, the Amazon and other European rivers) (Scranton & Mcshane, 1991; Sun et al., 2018).…”

Section: Resultssupporting

confidence: 93%

“…For CH 4 , a saturated HgCl 2 solution was added to each sample bottle to inhibit microbial activity (Ye, et al., 2021; G. L. Zhang et al., 2004). The bottles were then sealed, kept in the dark at 4°C and returned to a shore‐based laboratory.…”

Section: Methodsmentioning

confidence: 99%

“…For CH 4 , a saturated HgCl 2 solution was added to each sample bottle to inhibit microbial activity (Ye, et al, 2021;G. L. Zhang et al, 2004).…”

Section: Study Area and Sample Collectionmentioning

confidence: 99%

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Dimethylated Sulfur, Methane and Aerobic Methane Production in the Yellow Sea and Bohai Sea

Zhang

Tan

et al. 2023

JGR Oceans

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This paper presents a comprehensive study of biogenic dimethylated sulfur compounds and methane (CH4) from 27 March to 16 April 2018 (spring) and from 24 July to 10 August 2018 (summer) in the Yellow Sea and Bohai Sea. The overall distributions of dimethylsulfide (DMS), dimethylsulfoniopropionate (DMSP, precursor of DMS), dimethylsulfoxide (DMSO, oxidation product of DMS) and CH4 in surface waters were characterized by elevated concentrations in summer and in coastal waters, coupled to phytoplankton biomass and terrestrially sourced inputs. Surface waters were oversaturated with CH4. The flux distributions of DMS and CH4 were generally consistent with their concentration distributions. In situ incubation experiments revealed that microbial consumption was the main removal mechanism for DMS, which could remove up to 72.1% of the total DMS compared to sea‐to‐air exchange in the surface layer. High DMS release and enhanced DMS yields (34%‐62%) suggested more obvious influence from high DMSP concentrations (1 or 5 μm L‐1) on DMS production in oligotrophic waters with lower bacterial sulfur demand in contrast to near‐shore waters. Positive correlations were found between CH4 and DMSP (dissolved) in summer and DMSO (particulate and dissolved) in spring. A DMSP addition experiment suggested that DMSP could act as a precursor for aerobic methanogenesis, and CH4 preferentially occurs under nitrogen‐stressed conditions in the surface layers of the Yellow Sea and Bohai Sea.

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Section: Resultssupporting

confidence: 93%

Section: Methodsmentioning

confidence: 99%

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Dimethylated Sulfur, Methane and Aerobic Methane Production in the Yellow Sea and Bohai Sea

Zhang

Tan

et al. 2023

JGR Oceans

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“…Generally, methane concentrations in the YS and ECS (2.8–19.8 nM) were in the range observed globally in coastal waters (0.7–20 nM) (Weber et al., 2019). These concentrations were consistent with previously reported methane concentrations in the YS and ECS (Mao et al., 2022; Sun et al., 2018; Ye et al., 2022). Presumably, the distributions of methane in coastal seas are regulated by complex hydrological and biogeochemical processes, which can exert significant influence on the sources and sinks of methane from the system.…”

Section: Discussionsupporting

confidence: 93%

Dynamics and Controls of Methane Oxidation in the Aerobic Waters of Eastern China Marginal Seas

Liu,

Du,

et al. 2024

JGR Oceans

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Aerobic methane oxidation (MOx) mediated by methanotrophs is a crucial mechanism in controlling methane emissions from the surface ocean to the atmosphere. Coastal waters dominate global oceanic methane emissions, but the dynamics, controls and roles of MOx remain largely unconstrained in the marginal seas around China. Here, we conducted a variety of biogeochemical analyses to investigate the controls of methane cycling and the dynamics of methanotrophic activity in the East China Sea and Yellow Sea. Methane was supersaturated in the surface seawater and the concentrations ranged from 2.8 to 19.8 nM. The distribution of methane was regulated by the sources and sinks, which were influenced largely by hydrological and biogeochemical factors. Methane was turned over rapidly with high rates (k: 5 × 10−4–0.04 d−1), indicating the enzymatic capability of methanotrophic biomass to metabolize methane. Rates of MOx varied significantly between sites (1 × 10−3–0.60 nM d−1) and relatively high MOx rates were observed in shallow waters. MOx exhibited the Michaelis‐Menten kinetics with the Vmax of 0.30 nM d−1 and a Km of 78.3 nM. Methanotrophic activity was impacted by environmental factors such as methane availability, nutrient levels, bacterial production and temperature. Nutrient addition experiments demonstrated that phosphate elevated MOx rates, while the activity was largely inhibited by ammonium probably due to competitive inhibition of the methane monooxygenase by ammonia. Comparing the depth‐integrated MOx rates with the air‐sea fluxes at selected sites showed that methane consumed through microbial oxidation accounted for up to 78.1% of the total methane loss (=sum of MOx rates and air‐sea flux), highlighting the role of MOx as a microbial filter for methane emissions.

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Temporal patterns and determinants of atmospheric methane in Suzhou, the Yangtze River Delta

Guo

Lin

et al. 2023

Atmospheric Pollution Research

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Methane in the Yellow Sea and East China Sea: dynamics, distribution, and production

Cited by 4 publications

References 88 publications

Dimethylated Sulfur, Methane and Aerobic Methane Production in the Yellow Sea and Bohai Sea

Dimethylated Sulfur, Methane and Aerobic Methane Production in the Yellow Sea and Bohai Sea

Dynamics and Controls of Methane Oxidation in the Aerobic Waters of Eastern China Marginal Seas

Temporal patterns and determinants of atmospheric methane in Suzhou, the Yangtze River Delta

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