Tidal pumping drives nutrient and dissolved organic matter dynamics in a Gulf of Mexico subterranean estuary

Santos, Isaac R.; Burnett, William C.; Dittmar, Thorsten; Suryaputra, I Gusti Ngurah Agung; Chanton, Jeffrey P.

doi:10.1016/j.gca.2008.11.029

Cited by 241 publications

(171 citation statements)

References 67 publications

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“…High mineralization rates in sediments can cause a strong benthic-pelagic coupling of nutrient cycles Gibbes et al, 2008;Røy et al, 2008). There is also accumulating evidence that reactive marine-derived OM is rapidly degraded in shallow permeable sediments Ehrenhauss et al, 2004;Santos et al, 2009;Avery et al, 2012), which has led to their characterization as efficient biogeochemical filters for bioavailable compounds from coastal seawater (Rocha, 2008;Anschutz et al, 2009). However, submarine groundwater discharge from tidal flats and beaches to the coastal ocean also transports terrestrial DOM, a part of which may be relatively unreactive (Dittmar et al, 2012;Seidel et al, 2014Seidel et al, , 2015bCouturier et al, 2016).…”

Section: Om Transport From Small Rivers and Groundwatermentioning

confidence: 99%

Where Carbon Goes When Water Flows: Carbon Cycling across the Aquatic Continuum

et al. 2017

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The purpose of this review is to highlight progress in unraveling carbon cycling dynamics across the continuum of landscapes, inland waters, coastal oceans, and the atmosphere. Earth systems are intimately interconnected, yet most biogeochemical studies focus on specific components in isolation. The movement of water drives the carbon cycle, and, as such, inland waters provide a critical intersection between terrestrial and marine biospheres. Inland, estuarine, and coastal waters are well studied in regions near centers of human population in the Northern hemisphere. However, many of the world's large river systems and their marine receiving waters remain poorly characterized, particularly in the tropics, which contribute to a disproportionately large fraction of the transformation of terrestrial organic matter to carbon dioxide, and the Arctic, where positive feedback mechanisms are likely to amplify global climate change. There are large gaps in current coverage of environmental observations along the aquatic continuum. For example, tidally-influenced reaches of major rivers and near-shore coastal regions around river plumes are often left out of carbon budgets due to a combination of methodological constraints and poor data coverage. We suggest that closing these gaps could potentially alter global estimates of CO 2 outgassing from surface waters to the atmosphere by several-fold. Finally, in order to identify and constrain/embrace uncertainties in global carbon budget estimations it is important that we further adopt statistical and modeling approaches that have become well-established in the fields of oceanography and paleoclimatology, for example.

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Section: Om Transport From Small Rivers and Groundwatermentioning

confidence: 99%

Where Carbon Goes When Water Flows: Carbon Cycling across the Aquatic Continuum

et al. 2017

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“…However, studies have also shown net nitrate production and high nitrate concentrations in shallow STEs despite low nitrate concentrations in both terrestrial groundwater and seawater. This is linked to high seawater recirculation (i.e., due to tides or waves) through the shallow STE combined with non-conservative net nitrate production by the mineralization of organic matter ( Figure 4B) Santos et al, 2009d]. The transformation of nutrients is affected by the reaction rates and residence times, which are controlled by the flow and transport processes driven by the various forces discussed in Section 2.…”

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confidence: 99%

“…In systems with high seawater productivity and organic matter content, saline SGD associated with tide-and wave-induced seawater circulating through the STE may release nutrients to the ocean due to the mineralization of marine organic matter [Anwar et al, 2014;Sadat-Noori et al, 2016b;Santos et al, 2009d]. The loads of marine 31 organic matter delivered into a STE are lower where the coastal ocean is oligotrophic, which may result in FSGD rather than saline SGD dominating the nutrient fluxes to the ocean [Weinstein et al, 2011].…”

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confidence: 99%

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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

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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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“…3, a and b), was enriched near the paleochannel areas when there was SASW intrusion up the paleochannel. This provides evidence for the advection of continental groundwater or porewater, known to be enriched in silicate and other nutrients (SANTOS et al, 2009) (Fig. 3).…”

Section: Nutrientsmentioning

confidence: 74%

Submarine groundwater discharge revealed by radium isotopes (Ra-223 and Ra-224) near a paleochannel on the Southern Brazilian continental shelf

et al. 2013

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A B S T R A C TSubmarine Groundwater Discharge (SGD) has been recognized as an important component of the ocean-continent interface. The few previous studies in Brazil have focused on nearshore areas. This paper explores SGD on the Southern Brazilian Continental Shelf using multiple lines of evidence that include radium isotopes, dissolved nutrients, and water mass observations. The results indicated that SGD may be occurring on the Continental Shelf in the Albardão region, near a paleochannel located 50 km offshore. This paleochannel may thus be a preferential pathway for the delivery of nutrientand metal-enriched groundwater and porewater into continental shelf waters. R E S U M OA descarga de água subterrânea ("Submarine Groundwater Discharge"; SGD) é um importante elo entre continente-oceano. No Brasil, embora haja um crescente interesse em estudos sobre este tema, eles ainda são raros e se restringem às zonas costeiras. A presente investigação explora as evidências SGD na Plataforma Continental do Sul do Brasil, as quais incluem isótopos de rádio, nutrientes dissolvidos e distribuição das massas d'água. Os resultados indicam que a SGD pode ocorrer na Plataforma Continental na região do Albardão, próximo a um paleocanal localizado a 50 km da costa. Esse paleocanal pode, assim, ser o caminho preferencial de entrada de nutrientes e de águas subterrâneas ricas em metais na plataforma continental.

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Tidal pumping drives nutrient and dissolved organic matter dynamics in a Gulf of Mexico subterranean estuary

Cited by 241 publications

References 67 publications

Where Carbon Goes When Water Flows: Carbon Cycling across the Aquatic Continuum

Where Carbon Goes When Water Flows: Carbon Cycling across the Aquatic Continuum

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

Submarine groundwater discharge revealed by radium isotopes (Ra-223 and Ra-224) near a paleochannel on the Southern Brazilian continental shelf

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