Rare earth element cycling in a sandy subterranean estuary in Florida, USA

Chevis, Darren A.; Johannesson, Karen H.; Burdige, David J.; Cable, Jaye E.; Martin, Jonathan B.; Roy, Moutusi

doi:10.1016/j.marchem.2015.07.003

Cited by 33 publications

(71 citation statements)

References 74 publications

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“…Rare earth element concentrations for coastal seawater and coastal groundwaters from the Kona Coast are presented in Table 4. Rare earth element concentrations of these coastal groundwaters are, on average, lower than in groundwaters from the Indian River Lagoon subterranean estuary in Florida (Johannesson et al, 2011;Chevis et al, 2015b).…”

Section: Ree Concentrations and Input-normalized Fractionation Patternsmentioning

confidence: 73%

“…Nd concentration of 178 ± 12.9 pmol kg -1 (Table 4), whereas Nd concentrations measured in SGD from the Indian River Lagoon in Florida that were collected identically (i.e., 0.45 μm pore-size filters) range from 110 pmol kg -1 to 2409 pmol kg -1 , and exhibit a mean (±SD) Nd concentration of 448 ± 365 pmol kg -1 (n = 55; Johannesson et al, 2011;Chevis et al, 2015b). If the sample with the highest Nd concentration from the Indian River Lagoon subterranean estuary (i.e., 2409 pmol kg -1 ) is not included, the mean (±SD)…”

Section: Ree Concentrations and Input-normalized Fractionation Patternsmentioning

confidence: 99%

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Rare earth element behavior during groundwater–seawater mixing along the Kona Coast of Hawaii

Johannesson

Palmore

Fackrell

et al. 2017

Geochimica et Cosmochimica Acta

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100

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Groundwater and seawater samples were collected from nearshore wells and offshore along the Kona Coast of the Big Island of Hawaii to investigate rare earth element (REE) behavior in local subterranean estuaries. Previous investigations showed that submarine groundwater discharge (SGD) is the predominant flux of terrestrial waters to the coastal ocean along the arid Kona Coast of Hawaii. Groundwater and seawater samples were filtered through 0.45 μm and 0.02 μm pore-size filters to evaluate the importance of colloidal and soluble (i.e., truly dissolved ionic species and/or low molecular weight [LMW] colloids) fractions of the REEs in the local subterranean estuaries. Mixing experiments using groundwater collected immediately down gradient from a wastewater treatment facility (WWTF) proximal to the Kaloko-Hanokohau National Historic Park, and more "pristine" groundwater from a well constructed in a lava tube at Kiholo Bay, were mixed with local seawater to study the effect of solution composition (i.e., pH, salinity) on the concentrations and fractionation behavior of the REEs as groundwater mixes with seawater in Kona Coast subterranean estuaries. The mixed waters were also filtered through 0.45 or 0.02 μm filters to ascertain the behavior of colloidal and soluble fractions of the REEs across the salinity gradient in each mixing experiment. Concentrations of the REEs were statistically identical (two-tailed Student ttest, 95% confidence) between the sequentially filtered sample aliquots, indicating that the REEs occur as dissolved ionic species and/or LMW colloids in Kona Coast groundwaters. The mixing experiments revealed that the REEs are released to solution from suspended particles or colloids when Kona Coast groundwater waters mix with local seawater. The order of release that accompanies increasing pH and salinity follows

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Section: Ree Concentrations and Input-normalized Fractionation Patternsmentioning

confidence: 73%

Section: Ree Concentrations and Input-normalized Fractionation Patternsmentioning

confidence: 99%

Rare earth element behavior during groundwater–seawater mixing along the Kona Coast of Hawaii

Johannesson

Palmore

Fackrell

et al. 2017

Geochimica et Cosmochimica Acta

Self Cite

100

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“…In general, high enrichment of REE, relative to the simple binary mixing of meteoric groundwater and seawater has been observed in STEs, although the STE can also act as a sink for heavy REEs (HREE) owing to adsorption onto Fe oxides (Johannesson et al, 2011). In STEs, light REEs (LREE) are more readily exchangeable on aquifer mineral surfaces than HREEs, and HREEs and middle REEs (MREE) exhibit a greater association with oxide minerals (Willis and Johannesson, 2011;Chevis et al, 2015). Thus, redox conditions along the flow path of groundwater can affect REE concentration and fractionation (Johannesson et al, 2005(Johannesson et al, , 2011Johannesson, 2005, 2006).…”

Section: Geochemical Processesmentioning

confidence: 99%

“…Thus, redox conditions along the flow path of groundwater can affect REE concentration and fractionation (Johannesson et al, 2005(Johannesson et al, , 2011Johannesson, 2005, 2006). A case study carried out on a sandy STE in Florida (Chevis et al, 2015) showed that advection and bio-irrigation differentially affect REE fluxes to the ocean as fresh groundwater is enriched in HREEs, while marine pore-water is enriched in MREE in association with the reductive dissolution of Fe oxides/oxyhydroxides. Therefore, REE contributions to coastal waters are clearly identified due to large contributions of different REE patterns to coastal waters (Kim and Kim, 2011;Johannesson et al, 2017).…”

Section: Geochemical Processesmentioning

confidence: 99%

“…The compilation of Nd isotopes in the global ocean showed that the traditionally believed main Nd sources, e.g., rivers and atmosphere, cannot explain the large difference in Nd isotope ratios and concentrations in different basins, the so called "Nd paradox." Recent studies showed that SGD can account for the missing Nd source (>90% of the known source; Tachikawa et al, 2003;Johannesson and Burdige, 2007;Chevis et al, 2015). However, much more local and regional evidence are necessary to validate this hypothesis.…”

Section: Geochemical Processesmentioning

confidence: 99%

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Submarine Groundwater Discharge: Updates on Its Measurement Techniques, Geophysical Drivers, Magnitudes, and Effects

Taniguchi

Dulai

Burnett

et al. 2019

Front. Environ. Sci.

194

143

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The number of studies concerning Submarine Groundwater Discharge (SGD) grew quickly as we entered the twenty-first century. Many hydrological and oceanographic processes that drive and influence SGD were identified and characterized during this period. These processes included tidal effects on SGD, water and solute fluxes, biogeochemical transformations through the subterranean estuary, and material transport via SGD from land to sea. Here we compile and summarize the significant progress in SGD assessment methodologies, considering both the terrestrial and marine driving forces, and local as well as global evaluations of groundwater discharge with an emphasis on investigations published over the past decade. Our treatment presents the state-of-the-art progress of SGD studies from geophysical, geochemical, bio-ecological, economic, and cultural perspectives. We identify and summarize remaining research questions, make recommendations for future research directions, and discuss potential future challenges, including impacts of climate change on SGD and improved estimates of the global magnitude of SGD.

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