Preprints
https://doi.org/10.5194/bg-2017-254
https://doi.org/10.5194/bg-2017-254
17 Jul 2017
 | 17 Jul 2017
Status: this preprint has been retracted.

226Ra and 228Ra in the stratified estuary of the Krka River (Adriatic Sea, Croatia): implications for submarine groundwater discharge and its derived nutrients

Jianan Liu, Jinzhou Du, Blaženka Gašparović, Milan Čanković, Enis Hrustić, Neven Cukrov, Zhuoyi Zhu, and Ruifeng Zhang

Abstract. We conducted a field survey in the Krka River and its estuary (Croatia) in September 2014 to study the significance of submarine groundwater discharge (SGD) and derived nutrients. During the sampling period, the exchange time of the brackish water above the halocline in the Krka River Estuary (KRE) was calculated to be 8.3 ± 3.5 days. Three approaches of three end-member model, mass balance model and time series observation in tidal period based on Ra isotopes were used to evaluate the SGD fluxes in the KRE surface layer. We estimated the SGD flux to be (1.3–7.8) × 105 m3 d−1, which was approximately 2.7–16.1 % of the Krka River discharge into the estuary. By establishing the nutrient budgets in the KRE surface layer, SGD dominated the nutrient sources, followed by Krka River. SGD-derived dissolved inorganic nitrogen (DIN) and dissolved orthosilicate (DSi) contributed 26.8–68.6 % and 9.5–38.3 % to the total DIN and DSi fluxes into the surface waters of KRE, respectively. This indicates that SGD was likely a major external source of those nutrients in the KRE. We have identified that SGD-derived nutrients and their high N : P ratios may affect the ecosystem productivity in the KRE and nearby Adriatic.

This preprint has been retracted.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
Jianan Liu, Jinzhou Du, Blaženka Gašparović, Milan Čanković, Enis Hrustić, Neven Cukrov, Zhuoyi Zhu, and Ruifeng Zhang

Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
Jianan Liu, Jinzhou Du, Blaženka Gašparović, Milan Čanković, Enis Hrustić, Neven Cukrov, Zhuoyi Zhu, and Ruifeng Zhang
Jianan Liu, Jinzhou Du, Blaženka Gašparović, Milan Čanković, Enis Hrustić, Neven Cukrov, Zhuoyi Zhu, and Ruifeng Zhang

Viewed

Total article views: 1,505 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
1,031 418 56 1,505 60 72
  • HTML: 1,031
  • PDF: 418
  • XML: 56
  • Total: 1,505
  • BibTeX: 60
  • EndNote: 72
Views and downloads (calculated since 17 Jul 2017)
Cumulative views and downloads (calculated since 17 Jul 2017)

Viewed (geographical distribution)

Total article views: 1,458 (including HTML, PDF, and XML) Thereof 1,454 with geography defined and 4 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 20 Jul 2024
Download

This preprint has been retracted.

Short summary
In this manuscript, we evaluated the submarine groundwater discharge (SGD) by three approaches and its derived nutrients in the highly stratified Krka River Estuary (KRE), Croatia based on radium isotopes. By establishing the water and nutrient budgets in the KRE surface layer, even if SGD accounted for a small portion of the total water input, nutrient fluxes through SGD were significant, especially the high N : P ratios in SGD have the notable potential to impact the ecosystem of the KRE.
Altmetrics