Biogeochemical transport in the Loxahatchee River estuary, Florida: The role of submarine groundwater discharge

Swarzenski, Peter W.; Orem, William H.; McPherson, Benjamin F.; Baskaran, M.; Wan, Yongshan

doi:10.1016/j.marchem.2006.03.007

Cited by 70 publications

(36 citation statements)

References 78 publications

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“…In the remaining southern watershed, short rivers appear close to the coasts that are recharged by local precipitation and shallow groundwater, like Loxahatchee River in the east (Swarzenski et al, 2006). There, four samples (LX-1, LX-2, LX-3 and LX-5) were taken at the northwest fork of the river within 2 km of distance.…”

Section: Hydrology Of Sample Locationsmentioning

confidence: 99%

“…4) reflects the dissolution of carbonates underground and the mixing with seawater that is typical for Florida surface waters (Price and Samples with a bicarbonate-dominated composition are distributed in the whole study area and reflect the typical composition of the SAS (Sacks and Tihansky, 1996;Price and Swart, 2006;Swarzenski et al, 2006;Harvey and McCormick, 2009). The similarity of LX samples (major ions and stable isotopes) shows equal water input from groundwater along the river within its catchment (Figs.…”

Section: Physicochemical and Isotopic Characteristics Of Surface Watementioning

confidence: 99%

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Modeling calcification periods of <i>Cytheridella ilosvayi</i> from Florida based on isotopic signatures and hydrological data

Meyer

Wrozyna

Leis³

et al. 2017

Biogeosciences

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Abstract. The isotopic signatures of ostracod shells are the result of the temperature and composition of their host water and the phenology and ecology of the target species. Investigations addressing the influence of site-specific environmental variations on the isotopic ranges of ostracod shells are still rare but can provide important information on habitatdependent variations and may signify a seasonally restricted timing of calcification periods. Here we present isotopic signatures (δ 18 O ostr , δ 13 C ostr ) of living Cytheridella ilosvayi (Ostracoda) and physical, chemical, and isotopic (δD, δ 18 O water , δ 13 C DIC ) compositions of 14 freshwater habitats (rivers, lakes, canals, marshes, sinkholes) in South Florida from winter 2013 and summer 2014. We also present instrumental data of river temperatures and δ 18 O of precipitation (δ 18 O prec ) from this region. The physicochemical and isotopic compositions of the selected sites characterize the different habitats and show the influence of the source water, biological activity, and duration of exposure to the surface. Mean δ 18 O ostr and δ 13 C ostr signatures of C. ilosvayi shells correlate well with the isotopic composition of their host waters. Within-sample variabilities in repeated isotopic measurements of single ostracod shells reflect habitat-dependent ranges. The similarly high range of ostracod δ 18 O in rivers and one marsh sample indicates that both temperature and δ 18 O prec are responsible for their variation in the whole study area. Rivers and canals, which are predominantly influenced by the input and mixing of inorganic carbon from the catchment, show smaller δ 13 C ostr ranges than the marsh dominated by local fluctuations in biological activities.Based on these observations, background data of water temperatures and δ 18 O prec were used to calculate monthly δ 18 O variations in a theoretical calcite formed in rivers in Florida assuming a direct reaction on precipitation changes.The calculated values showed a high variation coupled with low mean values during the summer wet season, while during the winter dry season the variation remains small and mean values increased. Inferred configurations were used to approximate possible calcification periods of C. ilosvayi. For a plausible calcification period, mean values and ranges of δ 18 O ostr had to be equal to the theoretical calcite with a slight positive offset (vital effect). The applied model suggests a seasonal calcification period of C. ilosvayi in early spring that is probably coupled to the hydrologic cycle of Florida.

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Section: Hydrology Of Sample Locationsmentioning

confidence: 99%

Section: Physicochemical and Isotopic Characteristics Of Surface Watementioning

confidence: 99%

Modeling calcification periods of <i>Cytheridella ilosvayi</i> from Florida based on isotopic signatures and hydrological data

Meyer

Wrozyna

Leis³

et al. 2017

Biogeosciences

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“…We modeled σ gw as having a uniform distribution ranging from 5% to 100% of μ gw and σ co as having a uniform distribution ranging from 5% to 40% of μ co . σ gw and σ co were assumed to be independent of each other based on the observation that groundwater and coastal ocean samples collected from the same location can have different degrees of natural variability (e.g., Dulaiova et al 2006;Swarzenski et al 2006) because the factors controlling groundwater and surface water Ra activity are different. We chose a uniform distribution to enable us to compare different levels of relative uncertainty within a certain range.…”

Section: Methodsmentioning

confidence: 99%

“…Analytical uncertainties associated with these methods have been estimated based on replicate measurements of the same sample or standard (Moore 2000b, Rapaglia et al 2010) and on counting statistics and uncertainty propagation (Dulaiova and Burnett 2008;Loveless et al 2008;Peterson et al 2008). Reported analytical uncertainties in 226 Ra and 228 Ra activities generally range from 7% to 10% of sample activity (e.g., Moore 2000b; Charette et al 2001;Peterson et al 2008), but can be over 40% in some cases (e.g., Swarzenski et al 2006).…”

Section: Ra or 224mentioning

confidence: 99%

Using radium isotopes to characterize water ages and coastal mixing rates: A sensitivity analysis

Knee

García-Solsona

García-Orellana

et al. 2011

Limnology & Ocean Methods

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Numerous studies have used naturally occurring Ra isotopes ( Ra, with half-lives of 11.4 d, 3.7 d, 1600 y, and 5.8 y, respectively) to quantify water mass ages, coastal ocean mixing rates, and submarine groundwater discharge (SGD). Using Monte Carlo models, this study investigated how uncertainties in Ra isotope activities and the derived activity ratios (AR) arising from analytical uncertainty and natural variability affect the uncertainty associated with Ra-derived water ages and eddy diffusion coefficients, both of which can be used to calculate SGD. Analytical uncertainties associated with Ra activities were reported in most published studies to be less than 10% of sample activity; those reported for 223

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“…Other studies also incorporate geophysical technique such as seepage meters with 222 Rn measurement to examine groundwater discharge into the river [13]. Most of the groundwater discharge studies were carried out in-situ by a portable radon gas detector [14,15].…”

Section: -2506mentioning

confidence: 99%

Quantification of Groundwater-Derived Nutrients Into Beach Ridge Drainage Using Radon Mass Balance Model

2018

MJAS

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Groundwater discharge can be a significant pathway for dissolved nutrients to surface water and thus can bring forth important implications to the coastal biogeochemical cycles. Discrete sampling of radon concentrations at several locations along an interridge drainage off Setiu Wetlands were carried out to estimate the fluxes of groundwater discharge. The 222 Rn mass balance results show that groundwater discharge in the drainage is estimated to be 6649 m 3 day -1 , made up of ~33% of total water discharge and has contributed 2.88×10 2 molday -1 , 1.23×10 2 molday -1 and 0.75molday -1 of ammonium-nitrogen, nitrate-nitrogen and nitrite-nitrogen, respectively into the surface water drainage. Strong correlation between radon and ammonium suggested that the source of nutrient in drainage is groundwater-based, derived probably from the nearby damaged or leaking residential septic tanks and from agricultural practices of oil palm plantation.Keywords: groundwater-surface water interaction, water quality, beach ridge drainage, Setiu, Malaysia Abstrak Pelepasan air bawah tanah merupakan satu laluan penting untuk nutrien ke air permukaan. Proses ini mampu membawa implikasi yang penting terhadap kitaran biogeokimia di pesisiran pantai. Pensampelan radon di sepanjang saluran pematang pasir telah dijalankan untuk menentukan kadar pelepasan air bawah tanah. Hasil model keseimbangan jisim 222 Rn telah menunjukkan kadar pelepasan air bawah tanah di saluran adalah sebanyak 6649 m 3 hari -1 dan nilai ini merangkumi ~33% daripada jumlah pelepasan air. Pelepasan air bawah tanah juga menyumbang sebanyak 2.88×10 2 mol hari -1 amonium-nitrogen, 1.23×10 2 mol hari -1 nitrit-nitrogen dan 0.75 mol hari -1 dan nitrit-nitrogen ke air permukaan saluran. Kolerasi antara kepekatan radon dan ammonium di saluran juga mencadangkan sumber nutrien berasal dari air bawah tanah yang kemungkinan tercemar oleh sisa pembuangan kumbahan dari kawasan kediaman berdekatan dan rembesan pertanian dari ladang kelapa sawit di sekitarnya.Kata kunci: interaksi air bawah tanah-air permukaan, kualiti air, saluran pematang pasir, Setiu, Malaysia

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Biogeochemical transport in the Loxahatchee River estuary, Florida: The role of submarine groundwater discharge

Cited by 70 publications

References 78 publications

Modeling calcification periods of <i>Cytheridella ilosvayi</i> from Florida based on isotopic signatures and hydrological data

Modeling calcification periods of <i>Cytheridella ilosvayi</i> from Florida based on isotopic signatures and hydrological data

Using radium isotopes to characterize water ages and coastal mixing rates: A sensitivity analysis

Quantification of Groundwater-Derived Nutrients Into Beach Ridge Drainage Using Radon Mass Balance Model

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Biogeochemical transport in the Loxahatchee River estuary, Florida: The role of submarine groundwater discharge

Cited by 70 publications

References 78 publications

Modeling calcification periods of &lt;i&gt;Cytheridella ilosvayi&lt;/i&gt; from Florida based on isotopic signatures and hydrological data

Modeling calcification periods of &lt;i&gt;Cytheridella ilosvayi&lt;/i&gt; from Florida based on isotopic signatures and hydrological data

Using radium isotopes to characterize water ages and coastal mixing rates: A sensitivity analysis

Quantification of Groundwater-Derived Nutrients Into Beach Ridge Drainage Using Radon Mass Balance Model

Contact Info

Product

Resources

About

Modeling calcification periods of <i>Cytheridella ilosvayi</i> from Florida based on isotopic signatures and hydrological data

Modeling calcification periods of <i>Cytheridella ilosvayi</i> from Florida based on isotopic signatures and hydrological data