Articles | Volume 18, issue 5
https://doi.org/10.5194/os-18-1559-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/os-18-1559-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
26 Oct 2022
Research article |
| 26 Oct 2022
| 26 Oct 2022
Dimethyl sulfide cycling in the sea surface microlayer in the southwestern Pacific – Part 2: Processes and rates
Alexia D. Saint-Macary
CORRESPONDING AUTHOR
National Institute of Water and Atmospheric research, Wellington,
6021, New Zealand
Department of Marine Science, University of Otago, Dunedin, 9016, New
Zealand
Andrew Marriner
National Institute of Water and Atmospheric research, Wellington,
6021, New Zealand
Stacy Deppeler
National Institute of Water and Atmospheric research, Wellington,
6021, New Zealand
Karl A. Safi
National Institute of Water and Atmospheric Research, Hamilton, 3216,
New Zealand
National Institute of Water and Atmospheric research, Wellington,
6021, New Zealand
Department of Marine Science, University of Otago, Dunedin, 9016, New
Zealand
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Biogeosciences, 13, 4379–4388, https://doi.org/10.5194/bg-13-4379-2016, https://doi.org/10.5194/bg-13-4379-2016, 2016
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Bacterial extracellular enzymes play a significant role in the degradation of organic matter in the open ocean. Using artificial fluorogenic substrates, this research highlights potential artefacts in the response of bacterial glucosidase and aminopeptidase to ocean acidification, and the effects of three different acidification techniques. We conclude that fluorogenic substrate degradation is affected by, or alters pH, and bubbling CO2 may lead to the overestimation of carbohydrate degradation.
T. J. Burrell, E. W. Maas, P. Teesdale-Spittle, and C. S. Law
Biogeosciences Discuss., https://doi.org/10.5194/bgd-12-5841-2015, https://doi.org/10.5194/bgd-12-5841-2015, 2015
Manuscript not accepted for further review
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pH has a significant effect on the artificial fluorophore for glucosidase and protease activity, while artificial aminopeptidase substrate alters the pH of seawater. Reduction of coastal seawater pH to 7.8 was shown to increase β-glucosidase activity rapidly (0.5h), while no significant response was detected for leucine aminopeptidase. Seawater acidified by bubbling CO2 gas resulted in elevated β-glucosidase activity and bacterial cell numbers, although seasonal effects were observed.
T. G. Bell, W. De Bruyn, C. A. Marandino, S. D. Miller, C. S. Law, M. J. Smith, and E. S. Saltzman
Atmos. Chem. Phys., 15, 1783–1794, https://doi.org/10.5194/acp-15-1783-2015, https://doi.org/10.5194/acp-15-1783-2015, 2015
Related subject area
Approach: In situ Observations | Properties and processes: Biogeochemistry | Depth range: Surface | Geographical range: Deep Seas: South Pacific | Challenges: Oceans and climate
Dimethyl sulfide cycling in the sea surface microlayer in the southwestern Pacific – Part 1: Enrichment potential determined using a novel sampler
Alexia D. Saint-Macary, Andrew Marriner, Theresa Barthelmeß, Stacy Deppeler, Karl Safi, Rafael Costa Santana, Mike Harvey, and Cliff S. Law
Ocean Sci., 19, 1–15, https://doi.org/10.5194/os-19-1-2023, https://doi.org/10.5194/os-19-1-2023, 2023
Short summary
Short summary
The uppermost oceanic layer was sampled to determine what can explain a potential dimethyl sulfide (DMS) enrichment in this environment. A novel sampling method was used, and the results showed that DMS was not as enriched as expected. Our results showed that the phytoplanktonic composition influenced the DMS concentration, confirming results from another study in this oceanic region. However, additional factors are required to observe a DMS enrichment in the uppermost oceanic layer.
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Short summary
To understand how dimethyl sulfide (DMS) enrichment is maintained in the sea surface microlayer (SML) while DMS is lost to the atmosphere, deck-board incubation was carried out to determine DMS sources and sinks. Our results showed that the phytoplankton composition played an essential role in DMS processes in the SML. However, all accumulated DMS processes were lower than the calculated air–sea DMS flux.
To understand how dimethyl sulfide (DMS) enrichment is maintained in the sea surface microlayer...
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