Sulphur hexafluoride and helium-3 as sea-water tracers: deployment techniques and continuous underway analysis for sulphur hexafluoride

Add time:09/27/2019    Source:sciencedirect.com

Methods are described for the preparation and release of sulphur hexafluoride (SF6) and 3He to surface sea water for studies of gas exchange and as oceanographic tracers. Known amounts of the tracers (0.28 mol SF6 and 0.05 mol 3He, measured by gas chromatography with thermal conductivity detection) were dissolved in 1000 l of sea water in a gas-tight steel tank and later released at a depth of 10 m without modification of the initial 3He: SF6 ratio, by excluding all air from the tank. Techniques for deploying the tracers as a discrete patch in shallow, tidally active waters (30 ± 2 m, S.E. North Sea) and the labelling of the patch with drifter buoys are also given, Concentrations of SF6 in the patch were mapped from a survey vessel using an analysis system that determined concentrations in surface water by purge and trap followed by gas chromatography with electron-capture detection, in a fully automated, continuous sequence of analyses with a 3-min repeat time. Data were computer-matched with the ship's navigational data and used to construct a near real-time plot of the tracer patch in a reference frame which moved with the water mass. The plot was used to aid further navigation of the ship around the patch. The results from a typical mapping exercise are presented.

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