Net Submarine Groundwater‐Derived Dissolved Inorganic Nutrients and Carbon Input to the Oligotrophic Stratified Karstic Estuary of the Krka River (Adriatic Sea, Croatia)

Submarine groundwater discharge (SGD) is a signi fi cant source of biogenic elements in estuaries, and relevant studies in karstic estuaries are scarce. Krka River Estuary (KRE), located on the eastern Adriatic Sea (Croatia), is a typical oligotrophic strati fi ed karstic estuary. In this study, based on 226 Ra and 228 Ra, the total SGD fl ux into the KRE surface layer was estimated to be (12.8 – 16.2) × 10 5 m 3 /day. A conservative estimation of the fresh groundwater fl ux was (5.0 – 8.3) × 10 5 m 3 /day, which accounts for 10 – 17% of the Krka River discharge into the estuary. By establishing water and nutrient budgets in the KRE surface layer, we found that SGD dominated the nutrient sources, although it accounted for a small portion of the total in fl ow water. Speci fi cally, net SGD ‐ derived dissolved inorganic nitrogen (DIN) and silicates contributed 58 – 90% and 24 – 64%, respectively, to the total input fl uxes. These results indicate that SGD was a major external nutrient source, in which net SGD ‐ derived high DIN fl ux and high DIN to dissolved inorganic phosphorus ratio may affect productivity in the KRE ecosystem and nearby Adriatic

• Publication year

  2019

• Venue

  Journal of Geophysical Research: Oceans

• Publication date

  2019-06-01

• Fields of study

  Environmental Science

• Identifiers
  DOI 10.1029/2018JC014814
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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