Radium Isotopes and Nutrients in Razdolnaya River Estuary (Amur Bay, the Sea of Japan) in the Period of Summer Flood

Semkin, P. Yu.; Tishchenko, P. Ya.; Tishchenko, P. Ya.; Pavlova, G. Yu.; Anisimova, E. V.; Barabanshchikov, Yu. A.; Mikhailic, T. A.; Charakin, A. N.; Shvetsova, M. G.

doi:10.1134/s0097807822030137

Cited by 2 publications

(2 citation statements)

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“…It has been reported that saline waters interact with sediments, which are a source of radium isotopes, through various processes such as erosion, diffusion, and bio irrigation for the coastal embayment [25]. Other studies confirm that the contribution of 228 Ra due to erosion remains the main one for the shelf [45], including our results obtained for the summer flood in the Razdolnaya River Estuary [46]. The role of SW-GW interaction in the export of short-lived radium isotopes in the Razdolnaya River Estuary increases in some of the deepest areas, for example, the 224 Ra maximum at St. 4 (Table 2).…”

Section: Identification and Control Factorsof Sw-gw Interactionsupporting

confidence: 84%

“…The role of SW-GW interaction in the export of short-lived radium isotopes in the Razdolnaya River Estuary increases in some of the deepest areas, for example, the 224 Ra maximum at St. 4 (Table 2). However, the contribution of pore exchange to the export of 224 Ra for ichthyofauna exists in the Razdolnaya River Estuary [46]. The listed factors suggest careful use of 223 Ra, 224 Ra, and 228 Ra as groundwater tracers if there are no additional evident indicators, such as water temperature in our case.…”

Section: Identification and Control Factorsof Sw-gw Interactionmentioning

confidence: 82%

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Radium Isotopes and Hydrochemical Signatures of Surface Water-Groundwater Interaction in the Salt-Wedge Razdolnaya River Estuary (Sea of Japan) in the Ice-Covered Period

Semkin

Charkin

Pavlova

et al. 2023

Water

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The interaction of surface water and groundwater is important in the ecology of coastal basins, affecting hydrological conditions, oxygen regime, carbon, and nutrient exchange. This study demonstrates a dynamic connection between the salt-wedge region and its underlying aquifer in the eutrophic estuary. In winter, this estuary is covered with ice, and the river flow is at its lowest; that is why the specific response to groundwater discharge is best marked in this season. Groundwater admixture was detected in the salt-wedge region by highly active radium isotopes: 223Ra—4.80 ± 0.42 dpm 100 L−1, 224Ra—55.37 ± 1.1 dpm 100 L−1, and 228Ra—189.71 ± 4.66 dpm 100 L−1. The temperature of groundwater and river water was about +4 °C and 0 °C, respectively; that of seawater was −1.6 °C, and temperature increased up to +2.3 °C in the surface water–groundwater interaction region. Groundwater admixture is accompanied by a lower level of oxygen concentration of 52 μmol/kg; at that time, the maximum oxygen concentration in the salt-wedge region was 567 μmol/kg. In waters with a high activity of radium isotopes, there was a maximum partial pressure of CO2—4454 μatm at the range 100–150 μatm in the salt-wedge region and also observed extremum of NH4+, NO2−, and dissolved phosphorus. The surface water–groundwater interaction through anoxic sediment can form localized anaerobic areas despite the general oxygen supersaturation of eutrophic estuary waters and also cause local recycling of nutrients from bottom sediments.

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Section: Identification and Control Factorsof Sw-gw Interactionsupporting

confidence: 84%

Section: Identification and Control Factorsof Sw-gw Interactionmentioning

confidence: 82%