Articles | Volume 19, issue 1
https://doi.org/10.5194/os-19-1-2023
© Author(s) 2023. 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-19-1-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
11 Jan 2023
Research article |
| 11 Jan 2023
| 11 Jan 2023
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
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
Theresa Barthelmeß
GEOMAR Helmholtz Centre for Ocean Research Kiel, 24148 Kiel, Germany
Stacy Deppeler
National Institute of Water and Atmospheric Research, Wellington,
6021, New Zealand
Karl Safi
National Institute of Water and Atmospheric Research, Hamilton, 3216,
New Zealand
Rafael Costa Santana
National Institute of Water and Atmospheric Research, Wellington,
6021, New Zealand
Department of Marine Science, University of Otago, Dunedin, 9016, New
Zealand
Mike Harvey
National Institute of Water and Atmospheric Research, Wellington,
6021, New Zealand
deceased
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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During the Sea2cloud campaign in the Southern Pacific Ocean, we measured air-sea emissions from phytopankton of two key atmospheric compounds: DMS and MeSH. These compounds are well-known to play a great role in atmospheric chemistry and climate. We see in this paper that these compounds are most emited by the nanophytoplankton population. We provide here parameters for climate models to predict future trends of the emissions of these compounds and their roles and impacts on the global warming.
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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.
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During the Sea2cloud campaign in the Southern Pacific Ocean, we measured air-sea emissions from phytopankton of two key atmospheric compounds: DMS and MeSH. These compounds are well-known to play a great role in atmospheric chemistry and climate. We see in this paper that these compounds are most emited by the nanophytoplankton population. We provide here parameters for climate models to predict future trends of the emissions of these compounds and their roles and impacts on the global warming.
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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
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Glyoxal and methylglyoxal are short-lived organic trace gases and important precursors of secondary organic aerosol. Measurements over oceans are sparse. We present the first in situ glyoxal and methylglyoxal observations over remote temperate oceans, alongside observations of precursor gases. Precursor gases cannot explain observed mixing ratios, highlighting an unknown source. We show a large discrepancy between calculated vertical column densities of glyoxal and those retrieved by satellite.
A. M. S. McMillan, M. J. Harvey, R. J. Martin, A. M. Bromley, M. J. Evans, S. Mukherjee, and J. Laubach
Atmos. Meas. Tech., 7, 1169–1184, https://doi.org/10.5194/amt-7-1169-2014, https://doi.org/10.5194/amt-7-1169-2014, 2014
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 2: Processes and rates
Alexia D. Saint-Macary, Andrew Marriner, Stacy Deppeler, Karl A. Safi, and Cliff S. Law
Ocean Sci., 18, 1559–1571, https://doi.org/10.5194/os-18-1559-2022, https://doi.org/10.5194/os-18-1559-2022, 2022
Short summary
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.
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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.
The uppermost oceanic layer was sampled to determine what can explain a potential dimethyl...
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