Submarine groundwater discharge and associated fluxes of alkalinity and dissolved carbon into Moreton Bay (Australia) estimated via radium isotopes

Stewart, Benjamin T.; Santos, Isaac R.; Tait, Douglas R.; Macklin, Paul A.; Maher, Damien T.

doi:10.1016/j.marchem.2015.03.019

Cited by 64 publications

(32 citation statements)

References 68 publications

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“…Our results combined with earlier estimates of groundwater‐derived DOC fluxes (e.g., Goni and Gardner ; Moore et al ; Stewart et al ) illustrate the highly variable nature of groundwater DOC fluxes, surface water CDOM dynamics, and groundwater DOC concentrations in coastal environments. Except for a minor contribution of groundwater in wetland‐dominated systems, there were no consistent patterns within individual ecosystem types.…”

Section: Discussionsupporting

confidence: 80%

Groundwater as a source of dissolved organic matter to coastal waters: Insights from radon and CDOM observations in 12 shallow coastal systems

Webb

Santos

Maher

et al. 2018

Limnology & Oceanography

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The influence of groundwater and pore‐water exchange on dissolved organic matter (DOM) dynamics in coastal surface waters remains poorly understood. Here, we combine bottom up (i.e., groundwater‐derived flux estimates) and top down (i.e., water column response) evidence to assess whether groundwater exchange drives DOM dynamics in shallow coastal waters. We rely on automated chromophoric DOM (CDOM, a proxy for DOM) and radon (222Rn, groundwater proxy) measurements over tidal time scales in 12 shallow systems, including tidal freshwater wetlands, estuaries, mangroves, coral reefs, coastal lakes, a saltmarsh, and a residential canal estate. Groundwater‐derived dissolved organic carbon (DOC) fluxes ranged from 2 ± 2 mmol m−2 d−1 in a coral reef to 1941 ± 1325 mmol m−2 d−1 in a mangrove tidal creek. These groundwater fluxes replaced surface water DOC inventories on time scales ranging from ~ 0.5 d to several weeks. Systems with short replacement times displayed positive correlations between radon and CDOM in surface waters. Groundwater exchange diluted surface water DOC in four systems. Using multiple lines of evidence, we interpreted groundwater to be an important source of DOM to surface waters in 4 out of the 12 systems, including an offshore coral reef lagoon with low surface water DOC concentrations. Groundwater discharge was a negligible source of DOM in systems with high surface water DOC and CDOM concentrations such as tidal freshwater wetlands and coastal lakes. This investigation highlights the high variability in groundwater‐derived DOC fluxes and responses in the water column, and demonstrates that submarine groundwater discharge and advective pore‐water exchange should be considered in coastal carbon budgets.

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Section: Discussionsupporting

confidence: 80%

Groundwater as a source of dissolved organic matter to coastal waters: Insights from radon and CDOM observations in 12 shallow coastal systems

Webb

Santos

Maher

et al. 2018

Limnology & Oceanography

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“…Excess nutrients may be released from treated sewage discharge as previously suggested by studies focusing on d 15 N in macroalgae (Costanzo et al, 2001(Costanzo et al, , 2005. Sewage nutrients may travel to Moreton Bay via surface runoff (Eyre et al, 2011) or submarine groundwater discharge (Stewart et al, 2015) and eventually accumulate in sediments. Furthermore, the decrease in the organic C:N molar ratio and increase in d 13 C in successively younger sediments may be linked to an increasing TP content, increasing algal production and deposition.…”

Section: Carbon Nitrogen and Phosphorus Profilesmentioning

confidence: 93%

Examining 239+240 Pu, 210 Pb and historical events to determine carbon, nitrogen and phosphorus burial in mangrove sediments of Moreton Bay, Australia

Sanders

Santos

Maher

et al. 2016

Journal of Environmental Radioactivity

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“…In a similar study, Stewart et al [42] demonstrated the importance of submarine groundwater discharge for providing nutrients and dissolved carbon into Moreton Bay, Australia. Surface water and groundwater samples were taken from several locations at several depths around the bay to determine the flow of radium and dissolved carbon.…”

Section: Ra/ 223mentioning

confidence: 91%

“…This can be used to evaluate and identify sources of groundwater exchange with surface water, discharge of continental waters into coastal waters, and water retention times [40]. Recently, many studies focused on the introduction of radium isotopes into coastal water as a marker to better understand the incorporation of nutrients and freshwater by submarine groundwater discharge [41][42][43][44][45]. Sanial et al [41] Ra activities were high near the seafloor and surface and below detection limit activities at intermediate depths.…”

Section: Use Of Radium Isotopes As Natural Tracers In Hydrogeochemistrymentioning

confidence: 99%

The Radiochemical and Radiopharmaceutical Applications of Radium

2016

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This review focuses on the chemistry and application of radium isotopes to environmental monitoring, analytical, and medicinal uses. In recent years, radium has been used primarily as a tracer to study the migration of radioactive substances in environmental systems. Tracing the naturally occurring radium isotopes in mineral and water sources allows for the determination of source location, residence time, and concentrations. An understanding of the concentration of radionuclides in our food and water sources is essential to everyone's health as alpha particle decay is highly damaging in vivo. Due to this high radiobiological effectiveness, there is increased interest in using alpha-emitting radionuclides to prepare new, therapeutic radiopharmaceutical drugs. Selected studies from the recent literature are provided as examples of these modern applications of radium isotopes.

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Submarine groundwater discharge and associated fluxes of alkalinity and dissolved carbon into Moreton Bay (Australia) estimated via radium isotopes

Cited by 64 publications

References 68 publications

Groundwater as a source of dissolved organic matter to coastal waters: Insights from radon and CDOM observations in 12 shallow coastal systems

Groundwater as a source of dissolved organic matter to coastal waters: Insights from radon and CDOM observations in 12 shallow coastal systems

Examining 239+240 Pu, 210 Pb and historical events to determine carbon, nitrogen and phosphorus burial in mangrove sediments of Moreton Bay, Australia

The Radiochemical and Radiopharmaceutical Applications of Radium

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