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Article: Tidal Pumping-Induced Nutrients Dynamics and Biogeochemical Implications in an Intertidal Aquifer
Title | Tidal Pumping-Induced Nutrients Dynamics and Biogeochemical Implications in an Intertidal Aquifer |
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Authors | |
Keywords | Tidal fluctuation Nutrient dynamics Coastal groundwater mixing zone Biogeochemistry |
Issue Date | 2017 |
Publisher | American Geophysical Union, co-published with Wiley. The Journal's web site is located at http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)2169-8961 |
Citation | Journal of Geophysical Research: Biogeosciences, 2017, v. 122 n. 12, p. 3322-3342 How to Cite? |
Abstract | Tidal pumping is a major driving force affecting water exchange between land and sea, biogeochemical reactions in the intertidal aquifer, and nutrient loading to the sea. At a sandy beach of Tolo Harbour, Hong Kong, the nutrient (NH4+, NO2−, NO3−, and PO43−) dynamic in coastal groundwater mixing zone (CGMZ) is found to be fluctuated with tidal oscillation. Nutrient dynamic is mainly controlled by tidal pumping‐induced organic matter that serves as a reagent of remineralization in the aquifer. NH4+, NO2−, and PO43− are positively correlated with salinity. Both NH4+ and PO43− have negative correlations with oxidation/reduction potential. NH4+ is the major dissolved inorganic nitrogen species in CGMZ. The adsorption of PO43− onto iron oxides occurs at the deep transition zone with a salinity of 5–10 practical salinity unit (psu), and intensive N‐loss occurs in near‐surface area with a salinity of 10–25 psu. The biogeochemical reactions, producing PO43− and consuming NH4+, are synergistic effect of remineralization‐nitrification‐denitrification. In CGMZ, the annual NH4+ loss is estimated to be ~ 4.32 × 105 mol, while the minimum annual PO43− production is estimated to be ~ 2.55 × 104 mol. Applying these rates to the entire Tolo Harbour, the annual NH4+ input to the harbor through the remineralization of organic matters is estimated to be ~ 1.02 × 107 mol. The annual NH4+ loss via nitrification is 1.32 × 107 mol, and the annual PO43− production is ~ 7.76 × 105 mol. |
Persistent Identifier | http://hdl.handle.net/10722/264101 |
ISSN | 2023 Impact Factor: 3.7 2023 SCImago Journal Rankings: 1.459 |
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 | 2018-10-22T07:49:35Z | - |
dc.date.available | 2018-10-22T07:49:35Z | - |
dc.date.issued | 2017 | - |
dc.identifier.citation | Journal of Geophysical Research: Biogeosciences, 2017, v. 122 n. 12, p. 3322-3342 | - |
dc.identifier.issn | 2169-8953 | - |
dc.identifier.uri | http://hdl.handle.net/10722/264101 | - |
dc.description.abstract | Tidal pumping is a major driving force affecting water exchange between land and sea, biogeochemical reactions in the intertidal aquifer, and nutrient loading to the sea. At a sandy beach of Tolo Harbour, Hong Kong, the nutrient (NH4+, NO2−, NO3−, and PO43−) dynamic in coastal groundwater mixing zone (CGMZ) is found to be fluctuated with tidal oscillation. Nutrient dynamic is mainly controlled by tidal pumping‐induced organic matter that serves as a reagent of remineralization in the aquifer. NH4+, NO2−, and PO43− are positively correlated with salinity. Both NH4+ and PO43− have negative correlations with oxidation/reduction potential. NH4+ is the major dissolved inorganic nitrogen species in CGMZ. The adsorption of PO43− onto iron oxides occurs at the deep transition zone with a salinity of 5–10 practical salinity unit (psu), and intensive N‐loss occurs in near‐surface area with a salinity of 10–25 psu. The biogeochemical reactions, producing PO43− and consuming NH4+, are synergistic effect of remineralization‐nitrification‐denitrification. In CGMZ, the annual NH4+ loss is estimated to be ~ 4.32 × 105 mol, while the minimum annual PO43− production is estimated to be ~ 2.55 × 104 mol. Applying these rates to the entire Tolo Harbour, the annual NH4+ input to the harbor through the remineralization of organic matters is estimated to be ~ 1.02 × 107 mol. The annual NH4+ loss via nitrification is 1.32 × 107 mol, and the annual PO43− production is ~ 7.76 × 105 mol. | - |
dc.language | eng | - |
dc.publisher | American Geophysical Union, co-published with Wiley. The Journal's web site is located at http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)2169-8961 | - |
dc.relation.ispartof | Journal of Geophysical Research: Biogeosciences | - |
dc.rights | Copyright 2017 American Geophysical Union. To view the published open abstract, go to https://doi.org/10.1002/2017JG004017. | - |
dc.subject | Tidal fluctuation | - |
dc.subject | Nutrient dynamics | - |
dc.subject | Coastal groundwater mixing zone | - |
dc.subject | Biogeochemistry | - |
dc.title | Tidal Pumping-Induced Nutrients Dynamics and Biogeochemical Implications in an Intertidal Aquifer | - |
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 | 10.1002/2017JG004017 | - |
dc.identifier.scopus | eid_2-s2.0-85040692075 | - |
dc.identifier.hkuros | 294637 | - |
dc.identifier.volume | 122 | - |
dc.identifier.issue | 12 | - |
dc.identifier.spage | 3322 | - |
dc.identifier.epage | 3342 | - |
dc.identifier.isi | WOS:000423221300014 | - |
dc.publisher.place | United States | - |
dc.identifier.issnl | 2169-8953 | - |