Enhancement of dimethylsulfide production by anoxic stress in natural seawater

Omori, Yuko; Tanimoto, Hiroshi; Inomata, Satoshi; Wada, Shigeki; Thume, Kathleen; Pohnert, Georg

doi:10.1002/2015gl063546

Cited by 10 publications

(4 citation statements)

References 41 publications

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“…These high concentrations could not be explained by any known pathways and may imply an unknown -most likely microbial -DMS production pathway under anoxic conditions either in the water column or in the underlying sediments (Shenoy et al, 2012). Only recently it was shown that phytoplankton communities exposed to anoxic conditions increase their DMS production significantly (Omori et al, 2015). This implies a potential accumulation of DMS at oxic-anoxic boundaries of coastal OMZs which, in turn, might result in high DMS emissions from shallow coastal zones during anoxic/sulfidic events.…”

Section: The Role Of Omzs In Trace Gas Emissionsmentioning

confidence: 99%

Water column biogeochemistry of oxygen minimum zones in the eastern tropical North Atlantic and eastern tropical South Pacific oceans

et al. 2016

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Abstract. Recent modeling results suggest that oceanic oxygen levels will decrease significantly over the next decades to centuries in response to climate change and altered ocean circulation. Hence, the future ocean may experience major shifts in nutrient cycling triggered by the expansion and intensification of tropical oxygen minimum zones (OMZs), which are connected to the most productive upwelling systems in the ocean. There are numerous feedbacks among oxygen concentrations, nutrient cycling and biological productivity; however, existing knowledge is insufficient to understand physical, chemical and biological interactions in order to adequately assess past and potential future changes.In the following, we summarize one decade of research performed in the framework of the Collaborative Research Center 754 (SFB754) focusing on climate-biogeochemistry interactions in tropical OMZs. We investigated the influence of low environmental oxygen conditions on biogeochemical cycles, organic matter formation and remineralization, greenhouse gas production and the ecology in OMZ regions of the eastern tropical South Pacific compared to the weaker OMZ of the eastern tropical North Atlantic. Based on our findings, a coupling of primary production and organic matter export via the nitrogen cycle is proposed, which may, however, be impacted by several additional factors, e.g., micronutrients, particles acting as microniches, vertical and horizontal transport of organic material and the role of zooplankton and viruses therein.

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Section: The Role Of Omzs In Trace Gas Emissionsmentioning

confidence: 99%

Water column biogeochemistry of oxygen minimum zones in the eastern tropical North Atlantic and eastern tropical South Pacific oceans

et al. 2016

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“…Therefore, the oceanic DMS produced via multiple pathways can be affected by many biotic and abiotic factors, including temperature, salinity, solar radiation, mixed layer depth, nutrients, oxygen, acidity, etc. (Simó and Pedrós-Alió, 1999b;Vallina and Simó, 2007;Stefels, 2000;Zindler et al, 2014;Six et al, 2013;Omori et al, 2015;Stefels et al, 2007). In addition, seawater DMS has multiple removal pathways (bacterial consumption, photodegradation, sea-to-air ventilation, etc.…”

Section: Introductionmentioning

confidence: 99%

A 20-year (1998–2017) global sea surface dimethyl sulfide gridded dataset with daily resolution

Zhou,

Chen,

Huang

et al. 2023

Preprint

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Abstract. The oceanic emission of dimethyl sulfide (DMS) plays a vital role in the Earth's climate system and is a significant source of uncertainty in aerosol radiative forcing. Currently, the widely used monthly climatology of sea surface DMS concentration cannot meet the requirement for accurately simulating DMS-derived aerosols by chemical transport models. Thus, there is an urgent need to construct a global sea surface DMS dataset with high time resolution spanning multiple years. Here we develop an artificial neural network ensemble model based on 9 environmental factors, which demonstrate high accuracy and generalization in predicting DMS concentrations. Subsequently, a global sea surface DMS concentration and flux dataset (1°×1°) with daily resolution covering the period from 1998 to 2017 is established. According to this dataset, the global annual average concentration was ~1.82 nM, and the annual total emission was ~17.9 TgS yr–1, with ~60 % originating from the southern hemisphere. While overall seasonal variations are consistent with previous DMS climatologies, notable differences exist in regional-scale spatial distributions. The new dataset enables further investigation of daily and decadal variations. During 1998–2017, the global annual average concentration exhibited a slight decrease, while total emissions showed no significant trend. Benefiting from the incorporation of daily and interannual variation information, the DMS flux from our dataset showed a much stronger correlation with observed atmospheric methanesulfonic acid concentration compared to those from previous monthly climatologies. As a result, it can serve as an improved emission inventory of oceanic DMS and has the potential to enhance the simulation of DMS-derived aerosols and associated radiative effects. The new DMS gridded products are available at https://zenodo.org/record/7898187 (Zhou et al., 2023).

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“…In contrast, Wu et al (2018) reported that the DMS concentration declined in the hypoxic zone outside the Yangtze River and noted that the decreased phytoplankton biomass in the hypoxic zone was the main reason for the low DMS concentration. Omori et al (2015) used isotope labeling to culture natural planktonic assemblages under anoxic stress and reported that DMS production was considerably enhanced and DMS bacterial consumption was inhibited during a 1-hour laboratory culture. However, because the culture time was very short, this result does not re ect the changes in the microbial community related to the metabolism of dimethyl sulfur compounds or the potential ability to generate DMS over the long term.…”

Section: Introductionmentioning

confidence: 99%

Effects of coastal shellfish farming and hypoxic stress on DMS production

Zhang

Sun

Zhang

et al. 2022

Preprint

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Dimethylsulfide (DMS) plays an important role in the sulfur biogeochemical cycle and cloud formation on Earth. In the past few decades, coastal shellfish breeding facilities have developed rapidly and the number of hypoxic environments has increased rapidly in shallow coastal areas. However, the effects of hypoxia and marine animal feeding on DMS production remain controversial. The Yantai offshore area is an important shellfish breeding area where hypoxia occurs frequently in the bottom seawater during the summer. In this study, we found that particle dimethylsulfoniopropionate (DMSPp) and attached bacteria play dominated roles in DMS production and average DMS concentration in coastal shellfish farming region was 38.84% higher than that in non-shellfish farming region during the breeding period. Different from the zooplankton “sloppy feeding”, the shellfish “filter-feeding” first repackages the phytoplanktonic DMSP into fecal DMSP, and then degrades DMSPp into DMS by attracting attached bacteria. Based on field investigations and hypoxia simulation experiment, we found that hypoxic stress had no significant effect on the production or consumption of DMS in seawater and the decline rates of DMS at the sediment-water interface between the oxic and hypoxic groups were nearly identical. Therefore, no significant difference in average DMS concentration was observed between the mild hypoxic area and the other sea areas during the summer. Meanwhile, although the DMSP-degrading bacteria presented different responses to hypoxia, little difference was observed in the entire microbial community structure or the DMSP catabolizing genes.

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Enhancement of dimethylsulfide production by anoxic stress in natural seawater

Cited by 10 publications

References 41 publications

Water column biogeochemistry of oxygen minimum zones in the eastern tropical North Atlantic and eastern tropical South Pacific oceans

Water column biogeochemistry of oxygen minimum zones in the eastern tropical North Atlantic and eastern tropical South Pacific oceans

A 20-year (1998–2017) global sea surface dimethyl sulfide gridded dataset with daily resolution

Effects of coastal shellfish farming and hypoxic stress on DMS production

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