A high-resolution time-depth view of dimethylsulphide cycling in the surface sea

Royer, Sarah-Jeanne; Galí, Martí; Mahajan, Anoop S.; Ross, Oliver N.; Pérez, Gonzalo L.; Saltzman, E. S.; Simó, Rafel

doi:10.1038/srep32325

Cited by 39 publications

(35 citation statements)

References 74 publications

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“…4c, d). This negative effect of light was expected since photolysis is known as an important sink for DMS in the open ocean, sometimes as important as bacterial consumption in the near surface waters (Royer et al, 2016). However, removing light did not increase DMSP d removal rates (Fig.…”

Section: Influence Of Light On Dmsp Bacterial Metabolismmentioning

confidence: 94%

Dimethyl sulfide dynamics in first-year sea ice melt ponds in the Canadian Arctic Archipelago

et al. 2018

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Abstract. Melt pond formation is a seasonal pan-Arctic process. During the thawing season, melt ponds may cover up to 90 % of the Arctic first-year sea ice (FYI) and 15 to 25 % of the multi-year sea ice (MYI). These pools of water lying at the surface of the sea ice cover are habitats for microorganisms and represent a potential source of the biogenic gas dimethyl sulfide (DMS) for the atmosphere. Here we report on the concentrations and dynamics of DMS in nine melt ponds sampled in July 2014 in the Canadian Arctic Archipelago. DMS concentrations were under the detection limit (< 0.01 nmol L −1 ) in freshwater melt ponds and increased linearly with salinity (r s = 0.84, p ≤ 0.05) from ∼ 3 up to ∼ 6 nmol L −1 (avg. 3.7 ± 1.6 nmol L −1 ) in brackish melt ponds. This relationship suggests that the intrusion of seawater in melt ponds is a key physical mechanism responsible for the presence of DMS. Experiments were conducted with water from three melt ponds incubated for 24 h with and without the addition of two stable isotope-labelled precursors of DMS (dimethylsulfoniopropionate), (D6-DMSP) and dimethylsulfoxide ( 13 C-DMSO). Results show that de novo biological production of DMS can take place within brackish melt ponds through bacterial DMSP uptake and cleavage. Our data suggest that FYI melt ponds could represent a reservoir of DMS available for potential flux to the atmosphere. The importance of this ice-related source of DMS for the Arctic atmosphere is expected to increase as a response to the thinning of sea ice and the areal and temporal expansion of melt ponds on Arctic FYI.

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Section: Influence Of Light On Dmsp Bacterial Metabolismmentioning

confidence: 94%

Dimethyl sulfide dynamics in first-year sea ice melt ponds in the Canadian Arctic Archipelago

et al. 2018

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“…(2). Finally, note that PAR SAT is used in our algorithm both as a direct driver of DMS cycling processes and as a proxy for UVR-driven processes (e.g., Archer et al, 2010;Galí et al, 2013;Royer et al, 2016). For obvious astronomical reasons, incident PAR and UVR are strongly correlated.…”

Section: Statistical Explorationmentioning

confidence: 99%

Sea-surface dimethylsulfide (DMS) concentration from satellite data at global and regional scales

Galí¹,

Levasseur²,

Devred

et al. 2018

Biogeosciences

117

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Abstract. The marine biogenic gas dimethylsulfide (DMS) modulates climate by enhancing aerosol light scattering and seeding cloud formation. However, the lack of time-and space-resolved estimates of DMS concentration and emission hampers the assessment of its climatic effects. Here we present DMS SAT , a new remote sensing algorithm that relies on macroecological relationships between DMS, its phytoplanktonic precursor dimethylsulfoniopropionate (DMSPt) and plankton light exposure. In the first step, planktonic DMSPt is estimated from satellite-retrieved chlorophyll a and the light penetration regime as described in a previous study . In the second step, DMS is estimated as a function of DMSPt and photosynthetically available radiation (PAR) at the sea surface with an equation of the form: log 10 DMS = α+βlog 10 DMSPt+γ PAR. The two-step DMS SAT algorithm is computationally light and can be optimized for global and regional scales. Validation at the global scale indicates that DMS SAT has better skill than previous algorithms and reproduces the main climatological features of DMS seasonality across contrasting biomes. The main shortcomings of the global-scale optimized algorithm are related to (i) regional biases in remotely sensed chlorophyll (which cause underestimation of DMS in the Southern Ocean) and (ii) the inability to reproduce high DMS / DMSPt ratios in late summer and fall in specific regions (which suggests the need to account for additional DMS drivers). Our work also highlights the shortcomings of interpolated DMS climatologies, caused by sparse and biased in situ sampling. Time series derived from MODIS-Aqua in the subpolar North Atlantic between 2003 and 2016 show wide interannual variability in the magnitude and timing of the annual DMS peak(s), demonstrating the need to move beyond the classical climatological view. By providing synoptic time series of DMS emission, DMS SAT can leverage atmospheric chemistry and climate models and advance our understanding of plankton-aerosol-cloud interactions in the context of global change.

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“…3b, d). This negative effect of light was expected since photolysis is know as an important sink for DMS in the open ocean, sometimes as important as bacterial consumption in the near surface waters (Royer et al, 2016). However, removing light did not increase DMSP d removal rates (Fig.…”

Section: Influence Of Light On Dmsp Bacterial Metabolismmentioning

confidence: 77%

Dimethylsulfide dynamics in first-year sea ice melt ponds in the Canadian Arctic Archipelago

Gourdal¹,

Lizotte²,

Massé³

et al. 2017

Preprint

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Abstract.Melt pond formation is a natural seasonal pan-Arctic process. During the thawing season, melt ponds may cover up to 90% of the Arctic first year sea ice (FYI) and 15 to 25% of the multi-year sea ice (MYI). These pools of water lying at the surface of the sea-ice cover are habitats for microorganisms and represent a potential source of the biogenic gas dimethylsulfide (DMS) for the atmosphere. Here we report on the concentrations and dynamics of DMS in nine melt ponds sampled in July 2014 in the Eastern Canadian Arctic. DMS concentrations were under the detection limit (< 0.01 nmol l -1 ) in freshwater melt ponds, and increased linearly with salinity up to ca. 6 nmol l -1 in brackish melt ponds (r s = 0.84, p < 0.05). This relationship suggests that the intrusion of seawater in melt ponds is a key physical mechanism responsible for the presence of DMS.Results from experiments conducted with water from three melt ponds incubated for 24h with and without the addition of two stable isotope-labelled precursors of DMS (dimethylsulfoniopropionate (D6-DMSP) and dimethylsulfoxide ( 13 C-DMSO)show that de novo biological production of DMS can also take place within brackish melt ponds through bacterial DMSP uptake and cleavage. Our results suggest that FYI melt ponds could represent a reservoir of DMS ranging from ca. 6 to 11 tons of sulfur in the Arctic during July-August available for potential flux to the atmosphere. The importance of this icerelated source of DMS for the Arctic atmosphere is expected to increase as a response to the thinning of sea ice and the areal and temporal expansion of melt ponds on Arctic FYI.

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A high-resolution time-depth view of dimethylsulphide cycling in the surface sea

Cited by 39 publications

References 74 publications

Dimethyl sulfide dynamics in first-year sea ice melt ponds in the Canadian Arctic Archipelago

Dimethyl sulfide dynamics in first-year sea ice melt ponds in the Canadian Arctic Archipelago

Sea-surface dimethylsulfide (DMS) concentration from satellite data at global and regional scales

Dimethylsulfide dynamics in first-year sea ice melt ponds in the Canadian Arctic Archipelago

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