Oehler, Till and Moosdorf, Nils (2018) Comparison of dissolved silica and Radon as tracers for submarine groundwater discharge in high energy environments. [Poster] In: Ra/Rn Conference. , July 2018, Delmenhorst .

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Abstract

Radon has widely been successfully used as a tracer for submarine groundwater discharge (SGD) in nearshore environments, as it is in general highly enriched in groundwater, depleted in seawater, and behaves largely conservative. However, in some coastal environments the applicability of Radon as a tracer is limited. Radon is prone to degassing and thus not applicable in areas with high wind speeds or in high energy beaches with a surf zone. Furthermore, along coasts with quartz sands and carbonates, Radon concentrations are typically low in groundwater. We therefore investigated dissolved silica (DSi) as an alternative tracer to Radon in high energy environments. The advantages of DSi are that it’s not prone to degassing, while sampling, transport and analysis are easy and cost effective. Only small sampling volumes (~1 mL) are needed for a highly accurate analysis, thus pore water samples with a high vertical resolution of millimeters to centimeters in the sediment can be obtained. The disadvantages of DSi are that it is utilized by benthic and pelagic microorganisms, mostly diatoms, and that automated measurements so far do not exist. We used DSi as an alternative tracer for SGD studies in nearshore high energy environments at the southern karstic coast of Java (Indonesia) and the surf beach zone along the south western coast of India. While Radon has failed as a tracer for SGD in these environments, mostly due to atmospheric evasion, DSi could be applied successfully to trace SGD in this environment.

Document Type: Conference or Workshop Item (Poster)
Research affiliation: Biogeochemistry and Geology > Submarine Groundwater Discharge
Date Deposited: 01 Sep 2020 12:57
Last Modified: 01 Oct 2020 13:01
URI: http://cris.leibniz-zmt.de/id/eprint/4123

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