Impact of submarine groundwater discharge on biogeochemistry and microbial communities in pockmarks

Purkamo, Lotta; Ahn, Catia Milene Ehlert von; Jilbert, Tom; Muniruzzaman, Muhammad; Bange, Hermann W.; Jenner, Anna-Kathrina; Böttcher, Michael E.; Virtasalo, Joonas J.

doi:10.1016/j.gca.2022.06.040

Cited by 17 publications

(8 citation statements)

References 139 publications

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“…However, the key controls of surface-charge driven mechanisms and the specific effects on contaminant transport should be thoroughly explored beyond the assumptions and limitations of the current study, such as steady state flow, dimensionality, and the lack of reactive processes. Therefore, it would be of interest to investigate the effects of dynamic water flow conditions (e.g., Haberer et al 2012;Qi et al 2020), fully 3-D domains involving anisotropy and complex flow topology (e.g., Chiogna et al 2014;Ye et al 2015b), presence of other charged minerals (e.g., Prigiobbe and Bryant 2014;McNeece and Hesse 2017;Stolze et al 2019;Cogorno et al 2022), biogeochemical (e.g., Bauer et al 2009Purkamo et al 2022) and mineral dissolution/precipitation reactions (e.g., Tartakovsky et al 2008;Poonoosamy et al 2016;Soltanian et al 2015;Fakhreddine et al 2016;Battistel et al 2019;Pieretti et al 2022), multiphase flow and transport (e.g., Ahmadi et al 2022;. Further extension of this approach is also envisioned in synergy with hydrogeophysical exploration (e.g., ERT, DCIP), as well as in the context of engineered remediation involving electrokinetic transport (e.g., Wu et al 2012;Martens et al 2021;Alizadeh et al 2019;Sprocati et al 2020;Lo ´pez-Vizcaı ´no et al 2022).…”

Section: Discussionmentioning

confidence: 99%

Relevance of charge interactions for contaminant transport in heterogeneous formations: a stochastic analysis

Muniruzzaman

Rolle

2023

Stoch Environ Res Risk Assess

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The electrostatic properties of clay (or other charged) mineral surfaces play a significant role in the fate, transport, persistence, and remediation of subsurface contaminant plumes. This study presents a stochastic assessment of the impact and relevance of microscale electrostatic effects on macroscopic, field-scale contaminant transport in heterogeneous groundwater systems involving spatially distributed clay zones. We present Monte Carlo simulations in two-dimensional heterogeneous fields, comprising heterogeneous distributions of physical (i.e., hydraulic conductivity, porosity, tortuosity) and electrostatic (i.e., surface charge) properties, and compare scenarios with different combination and extent of physical and electrostatic processes. The simulations were performed with the multi-continua based reactive transport code, MMIT-Clay, and considering an explicit treatment of the diffuse layer processes. The results reveal that the microscopic electrostatic mechanisms within clay’s diffuse layer can significantly accelerate or retard a particular contaminant depending on its charge, leading to considerably different solute breakthroughs and mass loading/release behaviors in low permeability inclusions. Furthermore, we show that such variations in the macroscale transport behavior, solely driven by charge interactions, are statistically significant over the ensembles of Monte Carlo realizations. The simulations also demonstrate that the omission of electrostatic processes, which is still a common practice in subsurface hydrology, can lead to substantial over- or underestimation of contaminant migration.

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Section: Discussionmentioning

confidence: 99%

Relevance of charge interactions for contaminant transport in heterogeneous formations: a stochastic analysis

Muniruzzaman

Rolle

2023

Stoch Environ Res Risk Assess

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“…Because of the influence of domestic wastewater, rivers, and coral reefs, it is possible that groundwater that previously seeped into the subsurface may be upwelling from the coastal seafloor (Umezawa et al, 2002). Submarine groundwater discharge has been observed along the world's coasts, and it has been reported that as groundwater passes through sediments, it entrains and discharges reducing substances such as methane, hydrogen sulfide, and ammonia, which are rarely distributed in seawater (Lecher et al, 2016;Purkamo et al, 2022;Brankovits et al, 2017;Lecher, 2017;Lecher and Mackey, 2018;Sadat-Noori et al, 2018). Such an inflow of land water, such as groundwater or river water, could be observed using anomalies in the T-S diagram.…”

Section: Unidentified Methane Sources In the Shelf Areamentioning

confidence: 99%

Distribution of dissolved methane in seawater from the East China Sea to the Ryukyu forearc

Toki,

Chibana,

Shimabukuro

et al. 2023

Front. Earth Sci.

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Methane is a greenhouse gas, and the East China Sea acts as a source of emissions to the atmosphere. On the other hand, the distribution of methane concentration in the Ryukyu Arc shelf and forearc region has not been clarified. Therefore, we investigated the continental slope and continental shelf areas from the Okinawa Trough to the landward side and the island shelf and forearc areas to the seaward side of the East China Sea. The methane concentration in the Kuroshio Current region was very low, and the methane concentration in the seawater just above the seafloor in the area directly above the hydrothermal systems was exceptionally high. In addition, methane concentration in seawater just above the seafloor where cold seeps and mud volcanoes are known is higher than the background, and higher methane concentrations were found in continental slope area and the island shelf area. The results suggest the existence of previously unreported methane sources such as cold seeps and mud volcanoes in the continental slope region and the island shelf region.

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“…Contrary to the relatively stable conditions maintained in inland aquifers, coastal aquifers entail rapid fluctuations and steep physiochemical gradients to which STE microbes need to quickly adapt. This results in a highly diverse microbial community composition along the hydrological continuum of SGD sites, reflecting a mixture of seawater‐ and groundwater‐associated taxa (Adyasari et al., 2019; Chen et al., 2020; Degenhardt et al., 2020), as well as microbial functional groups that follow redox gradients (McAllister et al., 2015; Purkamo et al., 2022). Therefore, diverse prokaryotic groups in coastal ecosystems potentially affect bacterioplankton communities upon discharge into the marine environment (Lee et al., 2017; Ruiz‐González et al., 2021).…”

Section: Introductionmentioning

confidence: 99%

Allochthonous Groundwater Microorganisms Affect Coastal Seawater Microbial Abundance, Activity and Diversity

Yanuka‐Golub,

Belkin,

Weber

et al. 2024

JGR Biogeosciences

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Submarine groundwater discharge (SGD) is a globally important process supplying nutrients and trace elements to the coastal environment, thus playing a pivotal role in sustaining marine primary productivity. Along with nutrients, groundwater also contains allochthonous microbes that are discharged from the terrestrial subsurface into the sea. Currently, little is known about the interactions between groundwater‐borne and coastal seawater microbial populations, and groundwater microbes' role upon introduction to coastal seawater populations. Here, we investigated seawater microbial abundance, activity and diversity in a site strongly influenced by SGD. In addition, through laboratory‐controlled bottle incubations, we mimicked different mixing scenarios between groundwater and seawater. Our results demonstrate that the addition of 0.1 μm filtered groundwater stimulated heterotrophic activity and increased microbial abundance compared to control coastal seawater, whereas 0.22 μm filtration treatments induced primary productivity and Synechococcus growth. 16S rRNA gene sequencing showed a strong shift from a SAR11‐rich community in the control samples to Rhodobacteraceae dominance in the <0.1 μm treatment, in agreement with Rhodobacteraceae enrichment in the SGD field site. These results suggest that microbes delivered by SGD may affect the abundance, activity and diversity of intrinsic microbes in coastal seawater, highlighting the cryptic interplay between groundwater and seawater microbes in coastal environments, which has important implications for carbon cycling.

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Impact of submarine groundwater discharge on biogeochemistry and microbial communities in pockmarks

Cited by 17 publications

References 139 publications

Relevance of charge interactions for contaminant transport in heterogeneous formations: a stochastic analysis

Relevance of charge interactions for contaminant transport in heterogeneous formations: a stochastic analysis

Distribution of dissolved methane in seawater from the East China Sea to the Ryukyu forearc

Allochthonous Groundwater Microorganisms Affect Coastal Seawater Microbial Abundance, Activity and Diversity

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