Dynamics of groundwater‐derived nitrate and nitrous oxide in a tidal estuary from radon mass balance modeling

Wong, Wei Wen; Grace, Mike; Cartwright, Ian; Cardenas, M. Bayani; Zamora, Peter B.; Cook, Perran

doi:10.4319/lo.2013.58.5.1689

Cited by 42 publications

(62 citation statements)

References 58 publications

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“…Hwang et al (2005) reported higher fluxes of 21.4 mmol m − 2 d −1 driven by high SGD rates from Bangdu Bay on Jeju Island, Korea. In smaller estuarine systems, lower GW-derived DIN fluxes of 0.33 mmol m −2 d −1 were estimated from Pettaquamscutt Estuary, USA, likely due to a smaller groundwater nutrient reservoir in the region (Kelly and Moran, 2002) while average SGD-derived NO 3 flux from Werribee Estuary, Australia was reported to be 166 mmol m −2 d −1 , 35 fold higher than our average observations (Wong et al, 2013).…”

Section: Groundwater-derived Nutrient Inputs: Fresh Vs Salinementioning

confidence: 82%

“…7). Previous studies have also indicated that groundwater discharge plays an important role in delivering DIN to estuaries (Moore et al, 2006;Wong et al, 2013;Porubsky et al, 2014). In a study in the upper Gulf of Thailand, groundwater-derived DIN, DIP, DON and DOP were reported to be 40-50%, 60-70%, 30-40% and 30-130% of the fluxes delivered by the Chao Phraya River into the ocean (Burnett et al, 2007).…”

Section: Groundwater-derived Nutrient Inputs: Fresh Vs Salinementioning

confidence: 92%

“…While surface water runoff through rivers is often considered the main pathway for delivering nutrients to estuaries, submarine groundwater discharge (SGD) is also proven to be a significant source of nutrient transport from the land to coastal and estuarine waters Santos et al, 2014;Su et al, 2014). Previous studies have shown groundwater can be a major source of nutrients to continental margins (Kim and Swarzenski, 2010), coral reef lagoons , tropical islands , estuaries (Wong et al, 2013), mangroves (Gleeson et al, 2013) and coastal lagoons (Bernard et al, 2014).…”

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

Fresh meteoric versus recirculated saline groundwater nutrient inputs into a subtropical estuary

Sadat‐Noori

Santos

Tait

et al. 2016

Science of The Total Environment

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Section: Groundwater-derived Nutrient Inputs: Fresh Vs Salinementioning

confidence: 82%

Section: Groundwater-derived Nutrient Inputs: Fresh Vs Salinementioning

confidence: 92%

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Fresh meteoric versus recirculated saline groundwater nutrient inputs into a subtropical estuary

Sadat‐Noori

Santos

Tait

et al. 2016

Science of The Total Environment

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“…To estimate the discharge of fresh groundwater, we adapted a mass balance approach previously applied to some estuaries and coastal seas for 222 Rn (Cable et al 1996;Hwang et al 2005;Santos et al 2010;Wong et al 2013) and salinity (Hatta and Zhang 2013). 222 Rn and salt budgets in Obama Bay are summarized in Fig.…”

Section: Mass Balance Model For 222 Rn and Salinity In Obama Baymentioning

confidence: 99%

Seasonal Changes in Submarine Groundwater Discharge and Associated Nutrient Transport into a Tideless Semi-enclosed Embayment (Obama Bay, Japan)

Sugimoto

Honda

Kobayashi

et al. 2015

Estuaries and Coasts

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We carried out a seasonal study of fresh submarine groundwater discharge (SGD) and associated nutrient fluxes in a semi-enclosed bay along a tideless coastal zone using a 222 Rn and salinity mass balance model for a whole bay scale. The resulting SGD rates showed large intra-annual variability from 0.05×10 6 to 0.77×10 6 m 3 day −1 , which were controlled by seasonal changes in the interaction of multiple driving forces, including water table height and seawater level. The highest SGD rate in early spring was induced by heavy snow and low sea level, whereas the seasonal increase in sea level gradually suppressed fresh SGD rates. In summer, an elevated water table may induce higher SGD rates (approximately 0.4×10 6 m 3 day −1 ) regardless of high sea levels. The highest SGD fraction in total terrestrial freshwater fluxes also occurred in summer (>40 %), due to the decreasing rate of surface river discharge. The seasonally averaged SGD rate was 0.36×10 6 m 3 day −1 . This value was similar to the annual groundwater recharge rate (0.33×10 6 m 3 day −1 ) estimated by the water balance method in the basin. Nutrient fluxes from SGD were approximately 42, 65, and 33 % of all terrestrial fluxes of dissolved inorganic nitrogen, phosphorous, and silicate, respectively. The average fraction of SGD in the water fluxes including terrestrial and oceanic water was low (0.3 %), but that of nutrient fluxes increased to 20-38 %. Higher nutrient concentrations in groundwater compensated for the lower volumetric flux of groundwater. Because primary production was mostly restricted by phosphorous throughout the year, phosphorous-enriched nutrient transport via SGD would play an important role in biological production.

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“…SGD may be a two-fold source of N2O to surface waters. Initial investigations revealed significant fluxes of N2O associated with FSGD to an urban estuary [Wong et al, 2013] and in a coral reef lagoon where tides drive significant seawater recirculation through the aquifer [O'Reilly et al, 2015].…”

mentioning

confidence: 99%

Groundwater dynamics in subterranean estuaries of coastal unconfined aquifers: Controls on submarine groundwater discharge and chemical inputs to the ocean

Robinson¹,

Xin²,

Santos³

et al. 2018

Advances in Water Resources

214

148

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Sustainable coastal resource management requires sound understanding of interactions between coastal unconfined aquifers and the ocean as these interactions influence the flux of chemicals to the coastal ocean and the availability of fresh groundwater resources. The importance of submarine groundwater discharge in delivering chemical fluxes to the coastal ocean and the critical role of the subterranean estuary (STE) in regulating these fluxes is well recognized. STEs are complex and dynamic systems exposed to various physical, hydrological, geological, and chemical conditions that act on disparate spatial and temporal scales. This paper provides a review of the effect of factors that influence flow and salt transport in STEs, evaluates current understanding on the interactions between these influences, and synthesizes understanding of drivers of nutrient, carbon, greenhouse gas, metal and organic contaminant fluxes to the ocean.Based on this review, key research needs are identified. While the effects of density and tides are well understood, episodic and longer-period forces as well as the interactions between multiple influences remain poorly understood. Many studies continue to focus on idealized nearshore aquifer systems and future work needs to consider real world complexities such as geological heterogeneities, and non-uniform and evolving alongshore and cross-shore morphology. There is also a significant need for multidisciplinary research to unravel the interactions between physical and biogeochemical processes in the STE, as most existing studies treat these processes in isolation. Better understanding of this complex and dynamic system can improve sustainable management of coastal water resources under the influence of anthropogenic pressures and climate change.

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Dynamics of groundwater‐derived nitrate and nitrous oxide in a tidal estuary from radon mass balance modeling

Abstract: We monitored submarine groundwater discharge (SGD) into the Werribee Estuary, Australia, using both chemical and physical methods. SGD occurred at hotspots where 222 Rn persisted through a 12 month survey period. A significant correlation between 222 Rn and NO

Cited by 42 publications

References 58 publications

Fresh meteoric versus recirculated saline groundwater nutrient inputs into a subtropical estuary

Fresh meteoric versus recirculated saline groundwater nutrient inputs into a subtropical estuary

Seasonal Changes in Submarine Groundwater Discharge and Associated Nutrient Transport into a Tideless Semi-enclosed Embayment (Obama Bay, Japan)

Groundwater dynamics in subterranean estuaries of coastal unconfined aquifers: Controls on submarine groundwater discharge and chemical inputs to the ocean

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