Impact of water-particle interactions on molybdenum budget in humid tropical rivers and estuaries: insights from Nethravati, Gurupur and Mandovi river systems

Gurumurthy, G P; Tripti, M.; Riotte, Jean; Prakyath, R; Balakrishna, Keshava

doi:10.1016/j.chemgeo.2016.12.008

Cited by 9 publications

(14 citation statements)

References 53 publications

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“…Particulate Mo constitutes a mere 0.00%-0.08% of the total Mo content. This aligns with research on various riverine and estuarine systems, which report particulate Mo contributions of 0.00%-8.12% of total Mo content (Archer & Vance, 2008;Dalai et al, 2005;Gurumurthy et al, 2017;.…”

Section: Desorption From Particulate Mattersupporting

confidence: 87%

“…Mo adsorbed on particulate matter in riverine conditions is likely to be released into the estuarine dissolved phase due to alkaline pH and elevated ionic strength. Similar trends in particulate Mo/Al ratios have been reported in the Nethravati, Mandovi, and Zuari estuaries (Bauer et al, 2017;Gurumurthy et al, 2017;Renjan et al, 2017), correlating with salinity gradient. Particulate Fe/Al ratios also decrease in a manner akin to Mo/Al ratios and show a positive correlation with them (Figure 4e), indicating that the release Mo from Fe-Mn oxides in suspended particulate matter into solution in…”

Section: Variations In Particulate δ 98 Mo Spm Values In Summersupporting

confidence: 80%

“…The δ 98 Mo SPM values of suspended particulates exhibit notable spatial variability in the PRE (Figure 4g), with a consistent increase from the upper to the lower reaches of the estuary in both seasons. Prior research indicates that the geochemical composition of suspended particulate matter in estuarine systems may be influenced by the resuspension of surface sediment, particulate matter desorption/adsorption, redox reactions, and pH fluctuations (Audry et al., 2006; Bauer et al., 2017; Guinoiseau et al., 2018; Gurumurthy et al., 2017; Little et al., 2018; Mohajerin et al., 2016; Rahaman et al., 2010, 2014; Renjan et al., 2017; Samanta & Dalai, 2016; J. Zhang & Liu, 2002; Zwolsman & van Eck, 1999). In this section, we analyze the factors influencing the spatial variability of particulate δ 98 Mo SPM values from the upper to lower reaches of the PRE.…”

Section: Discussionmentioning

confidence: 99%

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Diagenesis Decreasing the Mo Isotopic Composition in Estuarine Systems: Implications for Constraining Its Riverine Input to Ocean

Wang,

Ye,

et al. 2024

Geochem Geophys Geosyst

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Understanding the geochemical behavior of the Mo isotopes in estuarine systems is essential for determining the isotopic composition of riverine inputs to the ocean and for assessing the historical oxidation state of Earth’s ancient oceans. However, the extent and mechanisms of Mo isotope fractionation during estuarine processes are not yet fully understood. This study systematically investigated the seasonal and spatial variations in aqueous and particulate δ98Mo values within the Pearl River Estuary (PRE). Our research found that aqueous δ98Moaque. values in both summer and winter deviated significantly from the theoretical mixing line for the PRE. Based on the geochemical characteristics of the water column, particulate matter, and pore water in the PRE, we first propose that diagenesis release from sediments is the predominant factor resulting in lower than anticipated aqueous δ98Moaque. values. Given the prevalence of suboxic and anoxic sediments in estuarine and coastal areas, such diagenetic release may substantially decrease the global riverine influx of aqueous Mo isotopes to the ocean. Additionally, particulate δ98MoSPM values exhibit an increasing trend (from 0.02 to 1.62‰) with increasing salinity in both seasons, suggesting that the terrestrial input particulate δ98MoSPM value would be heavier than the mean value for UCC. We hypothesize that the adsorption and desorption processes involving Fe (hydro) oxides predominantly influence this trend. This study advances our understanding of the mechanisms of aqueous and particulate Mo isotopic fractionation in estuarine systems and would be helpful in constraining Mo isotopic compositions of rivers and oceans.

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Section: Desorption From Particulate Mattersupporting

confidence: 87%

Section: Variations In Particulate δ 98 Mo Spm Values In Summersupporting

confidence: 80%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Diagenesis Decreasing the Mo Isotopic Composition in Estuarine Systems: Implications for Constraining Its Riverine Input to Ocean

Wang,

Ye,

et al. 2024

Geochem Geophys Geosyst

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“…-pH (Alkhatib et al, 2016;Gurumurthy et al, 2017;Lu and Allen, 2001;Peng et al, 2003;Shi et al, 1998;Tessier et al, 1989;Wang et al, 2017;White and Driscoll, 1987;Young and Harvey, 1992), -organic matter, generally defined by concentrations of dissolved and particulate organic carbon (Alkhatib et al, 2016;Zhang et al, 2013;Barreto et al, 2011;Lu and Allen, 2001;Mason and Sulliva, 1998;Naik and Hammerschmidt, 2011;Shafer et al, 1999),…”

mentioning

confidence: 99%

Kd distributions in freshwater systems as a function of material type, mass-volume ratio, dissolved organic carbon and pH

Tomczak

Boyer

Krimissa

et al. 2019

Applied Geochemistry

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“…Mandovi-Zuari (MZ) estuary is a tropical estuarine system that lies at the western Indian continental margin and marks a zone of mixing of freshwater brought by west-Cowing rivers and saline water due to incursion of Arabian Sea (Bgure 1) (Gaonkar et al 2013;Gurumurthy et al 2017). The region experiences variable seasonal freshwater supply mainly due to the river runoA following rainfall in the catchment and saline seawater intrusion due to tidal inCuence.…”

Section: Introductionmentioning

confidence: 99%

Seasonal freshwater flux estimation using mollusc from the tropical Mandovi Zuari estuary, Goa, India

et al. 2021

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Seawater incursion and freshwater discharges into the tropical Mandovi Zuari (MZ) estuary is investigated here using stable oxygen isotope data on monthly water samples from locations spatially separated within the estuary. Surface water samples were analysed for d 18 O and salinity relationship, d 18 O ¼ 0:0843 Â S À 2:1; where freshwater end member is designated as À2.1%; similar to the composition recorded for the rain water. We have estimated percentage of monthly freshwater Cuxes into the estuary using mass balance equation adopting an isotopic value of seawater end member. Our estimates showed freshwater contribution to the estuary water during monsoon time was 63%, while in the postmonsoon season the fraction drops to 34.7%. The contribution of the freshwater registered a minimum value of 6.8% during the pre-monsoon season. Further, we analysed the seasonal growth band secreted by the mollusc from the same estuary to understand the potential of mollusc as a recorder of seasonal water composition. The d 18 O of mollusc shell growth layers varied over a range between À4.3% and À2.1%. We interpreted this as seasonal signal assuming the growth rate from the culture experiment. The d 18 O of estuary water and observed temperature are used to simulate the isotopic composition of seasonal growth bands. The lighter d 18 O value of À4.3% precipitated during the month of July 2010, which coincides with the time of low productivity (d 13 C = À3.5%). While the heavier d 18 O (À2.1%) is recorded in the growth layer generated during November 2010 deBning the period of post-monsoon growth.

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Impact of water-particle interactions on molybdenum budget in humid tropical rivers and estuaries: insights from Nethravati, Gurupur and Mandovi river systems

Cited by 9 publications

References 53 publications

Diagenesis Decreasing the Mo Isotopic Composition in Estuarine Systems: Implications for Constraining Its Riverine Input to Ocean

Diagenesis Decreasing the Mo Isotopic Composition in Estuarine Systems: Implications for Constraining Its Riverine Input to Ocean

Kd distributions in freshwater systems as a function of material type, mass-volume ratio, dissolved organic carbon and pH

Seasonal freshwater flux estimation using mollusc from the tropical Mandovi Zuari estuary, Goa, India

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