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Article: Using Tidal Fluctuation-Induced Dynamics of Radium Isotopes (224Ra, 223Ra, and 228Ra) to Trace the Hydrodynamics and Geochemical Reactions in a Coastal Groundwater Mixing Zone
Title | Using Tidal Fluctuation-Induced Dynamics of Radium Isotopes (224Ra, 223Ra, and 228Ra) to Trace the Hydrodynamics and Geochemical Reactions in a Coastal Groundwater Mixing Zone |
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Authors | |
Keywords | Radium isotopes Tidal fluctuation Geochemical reactions Hydrodynamics Redox conditions Dissolved inorganic carbon Nutrients Trace metals |
Issue Date | 2018 |
Publisher | American Geophysical Union. The Journal's web site is located at http://www.agu.org/journals/wr/ |
Citation | Water Resources Research, 2018, v. 54 n. 4, p. 2909-2930 How to Cite? |
Abstract | The reactive transport of radium isotopes (224Ra, 223Ra, and 228Ra) in coastal groundwater mixing zones (CGMZs) is sensitive to shifts of redox conditions and geochemical reactions induced by tidal fluctuation. This study presents a spatial distribution and temporal variation of radium isotopes in the CGMZ for the first time. Results show that the activity of radium isotopes in the upper saline plume (USP) is comparatively low due to a short residence time and mixing loss induced by the infiltration of low radium seawater whereas the activity of radium isotopes in the salt wedge (SW) is comparatively high due to a long residence time in the aquifer. The spatial distribution of radium isotopes is determined by the partitioning of radium isotopes, groundwater residence time, and relative ingrowth rates of radium isotopes. In addition, the variation of radium isotopes in the USP lags slightly (∼0 h) whereas the fluctuation of radium isotopes in the SW lags significantly (∼12 h) behind sea level oscillation. Tidal fluctuation affects the partitioning of radium isotopes through controlling seawater infiltration and subsequently influences the dynamics of radium isotopes in the USP. Concurrently, seawater infiltration significantly affects geochemical processes such as the production of nutrients and total alkalinity. Therefore, radium dynamics in the USP have implications for these geochemical processes. The variation of radium isotopes in the USP also has potential implications for transformation of trace metals such as iron and manganese because of the close affinity of radium isotopes to manganese and iron oxides. |
Persistent Identifier | http://hdl.handle.net/10722/264098 |
ISSN | 2023 Impact Factor: 4.6 2023 SCImago Journal Rankings: 1.574 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Liu, Y | - |
dc.contributor.author | Jiao, JJ | - |
dc.contributor.author | Liang, W | - |
dc.contributor.author | Luo, X | - |
dc.date.accessioned | 2018-10-22T07:49:30Z | - |
dc.date.available | 2018-10-22T07:49:30Z | - |
dc.date.issued | 2018 | - |
dc.identifier.citation | Water Resources Research, 2018, v. 54 n. 4, p. 2909-2930 | - |
dc.identifier.issn | 0043-1397 | - |
dc.identifier.uri | http://hdl.handle.net/10722/264098 | - |
dc.description.abstract | The reactive transport of radium isotopes (224Ra, 223Ra, and 228Ra) in coastal groundwater mixing zones (CGMZs) is sensitive to shifts of redox conditions and geochemical reactions induced by tidal fluctuation. This study presents a spatial distribution and temporal variation of radium isotopes in the CGMZ for the first time. Results show that the activity of radium isotopes in the upper saline plume (USP) is comparatively low due to a short residence time and mixing loss induced by the infiltration of low radium seawater whereas the activity of radium isotopes in the salt wedge (SW) is comparatively high due to a long residence time in the aquifer. The spatial distribution of radium isotopes is determined by the partitioning of radium isotopes, groundwater residence time, and relative ingrowth rates of radium isotopes. In addition, the variation of radium isotopes in the USP lags slightly (∼0 h) whereas the fluctuation of radium isotopes in the SW lags significantly (∼12 h) behind sea level oscillation. Tidal fluctuation affects the partitioning of radium isotopes through controlling seawater infiltration and subsequently influences the dynamics of radium isotopes in the USP. Concurrently, seawater infiltration significantly affects geochemical processes such as the production of nutrients and total alkalinity. Therefore, radium dynamics in the USP have implications for these geochemical processes. The variation of radium isotopes in the USP also has potential implications for transformation of trace metals such as iron and manganese because of the close affinity of radium isotopes to manganese and iron oxides. | - |
dc.language | eng | - |
dc.publisher | American Geophysical Union. The Journal's web site is located at http://www.agu.org/journals/wr/ | - |
dc.relation.ispartof | Water Resources Research | - |
dc.rights | Copyright 2018 American Geophysical Union. To view the published open abstract, go to https://doi.org/10.1002/2017WR022456. | - |
dc.subject | Radium isotopes | - |
dc.subject | Tidal fluctuation | - |
dc.subject | Geochemical reactions | - |
dc.subject | Hydrodynamics | - |
dc.subject | Redox conditions | - |
dc.subject | Dissolved inorganic carbon | - |
dc.subject | Nutrients | - |
dc.subject | Trace metals | - |
dc.title | Using Tidal Fluctuation-Induced Dynamics of Radium Isotopes (224Ra, 223Ra, and 228Ra) to Trace the Hydrodynamics and Geochemical Reactions in a Coastal Groundwater Mixing Zone | - |
dc.type | Article | - |
dc.identifier.email | Jiao, JJ: jjiao@hku.hk | - |
dc.identifier.email | Luo, X: xinluo@hku.hk | - |
dc.identifier.authority | Jiao, JJ=rp00712 | - |
dc.identifier.authority | Luo, X=rp02606 | - |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.1002/2017WR022456 | - |
dc.identifier.scopus | eid_2-s2.0-85048000099 | - |
dc.identifier.hkuros | 294627 | - |
dc.identifier.volume | 54 | - |
dc.identifier.issue | 4 | - |
dc.identifier.spage | 2909 | - |
dc.identifier.epage | 2930 | - |
dc.identifier.isi | WOS:000434186400023 | - |
dc.publisher.place | United States | - |
dc.identifier.issnl | 0043-1397 | - |