Reaction of DMS and HOBr as a Sink for Marine DMS and an Inhibitor of Bromoform Formation

Müller, Emanuel; Gunten, Urs von; Bouchet, Sylvain; Droz, Boris; Winkel, Lenny H. E.

doi:10.1021/acs.est.0c08189

Cited by 9 publications

(8 citation statements)

References 79 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, a recent study identified the reaction of DMS with hypobromous acid as a potential marine DMS removal mechanism. 56 However, our study did not provide direct evidence of this pathway. Besides, we guess vertical mixing may serve as a potential sink of mixedlayer DMS.…”

Section: Modeled Photochemical Processescontrasting

confidence: 68%

See 1 more Smart Citation

Revealing the Marine Cycles of Volatile Sulfur Compounds and Their Biogeochemical Controls: A Case of the Western North Pacific

Xu,

Zhang,

Zhong

et al. 2024

Environ. Sci. Technol.

View full text Add to dashboard Cite

Volatile sulfur compounds, such as dimethyl sulfide (DMS), carbonyl sulfide (OCS), and carbon disulfide (CS 2 ), have significant implications for both atmospheric chemistry and climate change. Despite the crucial role of oceans in regulating their atmospheric budgets, our comprehension of their cycles in seawater remains insufficient. To address this gap, a field investigation was conducted in the western North Pacific to clarify the sources, sinks, and biogeochemical controls of these gases in two different marine environments, including relatively eutrophic Kuroshio−Oyashio extension (KOE) and oligotrophic North Pacific subtropical gyre. Our findings revealed higher concentrations of these gases in both seawater and the atmosphere in the KOE compared to the subtropical gyre. In the KOE, nutrient-rich upwelling stimulated rapid DMS biological production, while reduced seawater temperatures hindered the removal of OCS and CS 2 , leading to their accumulation. Furthermore, we have quantitatively evaluated the relative contribution of each pathway to the source and sink of DMS, OCS, and CS 2 within the mixed layer and identified vertical exchange as a potential sink in most cases, transporting substantial amounts of these gases from the mixed layer to deeper waters. This research advances our understanding of sulfur gas source-sink dynamics in seawater, contributing to the assessment of their marine emissions and atmospheric budgets.

show abstract

Section: Modeled Photochemical Processescontrasting

confidence: 68%

“…Unidentified DMS sinks within the mixed layer, which have not been considered in this study, may contribute to this discrepancy. For example, a recent study identified the reaction of DMS with hypobromous acid as a potential marine DMS removal mechanism . However, our study did not provide direct evidence of this pathway.…”

Section: Resultsmentioning

confidence: 99%

Revealing the Marine Cycles of Volatile Sulfur Compounds and Their Biogeochemical Controls: A Case of the Western North Pacific

Xu,

Zhang,

Zhong

et al. 2024

Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Isoprene could have reacted with H 2 O 2 in seawater as it does in acidic aerosols 26 . Besides, should dissolved 27 BrPOs from seaweeds or outer-membrane-bound 28 BrPOs from phytoplankton occur, they would have reacted with added H 2 O 2 to produce hypobromous acid (HOBr), a strong oxidant 29 that would further remove isoprene. Indeed, the addition of BrPO consumed isoprene because it produced HOBr by reaction with the naturally occurring H 2 O 2 .…”

Section: Resultsmentioning

confidence: 99%

Substantial loss of isoprene in the surface ocean due to chemical and biological consumption

Simó

Cortés-Greus

Rodríguez-Ros

et al. 2022

Commun Earth Environ

View full text Add to dashboard Cite

Isoprene contributes to the formation of ozone and secondary organic aerosol in the atmosphere, and thus influences cloud albedo and climate. Isoprene is ubiquitous in the surface open ocean where it is produced by phytoplankton, however emissions from the global ocean are poorly constrained, in part due to a lack of knowledge of oceanic sink or degradation terms. Here, we present analyses of ship-based seawater incubation experiments with samples from the Mediterranean, Atlantic, tropical Pacific and circum-Antarctic and Subantarctic oceans to determine chemical and biological isoprene consumption in the surface ocean. We find the total isoprene loss to be comprised of a constant chemical loss rate of 0.05 ± 0.01 d−1 and a biological consumption rate that varied between 0 and 0.59 d−1 (median 0.03 d−1) and was correlated with chlorophyll-a concentration. We suggest that isoprene consumption rates in the surface ocean are of similar magnitude or greater than ventilation rates to the atmosphere, especially in chlorophyll-a rich waters.

show abstract

“…However, as we used environmentally relevant nitrate/DOS concentration ratios, the photo chemical reaction between nitrate and DOS in the culture experiment was similar to that under natural conditions. Similarly, previous research used environmentally relevant DMS/DOM concentration ratios to simulate the real marine environment to explore the reaction between DMS and hypobromous acid (Muller et al, 2021). Figure 3 presents the COS production profiles in surface seawater with/without cysteine and nitrate additions at room temperature.…”

Section: Effect Of Nitrate On Cos Production Under Simulated Sunlightmentioning

confidence: 99%

Effect of Nitrate on the Photochemical Production of Carbonyl Sulfide From Surface Seawater

Xing

2022

Geophysical Research Letters

View full text Add to dashboard Cite

Carbonyl sulfide (COS) plays an important role in the sulfur cycle and climate change. Yet, much remains unknown about the photochemical mechanisms of COS in nutrient‐rich seawater. We measured the photochemical production rates of COS in the surface seawater of the Indian Ocean under sunlight irradiation. The photochemical production of COS was mainly initiated by ultraviolet (UV) radiation with UVA contributing approximately 68% to the total COS production. Using cysteine, a typical proxy of dissolved organic sulfur, the effect of enhanced nitrate concentration on COS formation was conducted in authentic seawater during simulated sunlight irradiation, indicating the enhancement of the COS formation with increasing nitrate concentrations. This result revealed that the generation of hydroxyl radical with nitrate photolysis plays a key role in the COS formation process. These findings improve our understanding of the marine COS photoproduction cycle and the impact of nitrate on the COS photochemical production in surface seawater.

show abstract

Reaction of DMS and HOBr as a Sink for Marine DMS and an Inhibitor of Bromoform Formation

Cited by 9 publications

References 79 publications

Revealing the Marine Cycles of Volatile Sulfur Compounds and Their Biogeochemical Controls: A Case of the Western North Pacific

Revealing the Marine Cycles of Volatile Sulfur Compounds and Their Biogeochemical Controls: A Case of the Western North Pacific

Substantial loss of isoprene in the surface ocean due to chemical and biological consumption

Effect of Nitrate on the Photochemical Production of Carbonyl Sulfide From Surface Seawater

Contact Info

Product

Resources

About