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Virtasalo, Joonas J; Schröder, Jan F; Luoma, Samrit; Majaniemi, Juha; Mursu, Juha; Scholten, Jan Christoph (2019): Sea surface radon-222 concentration survey from the Hanko submarine groundwater discharge site, northern Baltic Sea, Finland. PANGAEA,, In supplement to: Virtasalo, JJ et al. (2019): Submarine groundwater discharge site in the First Salpausselkä ice-marginal formation, south Finland. Solid Earth, 10, 405-423,

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Sea surface radon-222 measurements were carried out onboard the research boat Gridi. The survey was run at 1.4 knots, with the boat position recorded by DGPS. Two pumps that continuously supplied water for the measurements were fixed at ca. 50 cm water depth with a Sea & Sun Technology CTD90M multiprobe that was recording pressure (depth), temperature and conductivity (salinity). The radon measurements were carried out using two identical systems in parallel, each equipped with a 3M MiniModule gas contractor that separates the dissolved gas from the continuously pumped water. The gas was dried with a Drierite gas-drying unit, and analysed with a Durridge RAD7 radon detector. The radon-in-water activity concentrations were calculated using the salinity and temperature dependent fractionation of radon-222 between air and water.
cesium; groundwater; loss on ignition; Oxygen; radon; Salinity; sand; seawater; submarine groundwater discharge; Temperature; turbidity
Median Latitude: 59.891313 * Median Longitude: 23.235984 * South-bound Latitude: 59.882700 * West-bound Longitude: 23.225350 * North-bound Latitude: 59.898220 * East-bound Longitude: 23.255970
Date/Time Start: 2018-05-23T12:05:00 * Date/Time End: 2018-05-23T17:36:00
Lappohja_bay (First Salpausselkä ice-marginal formation) * Latitude: 59.891000 * Longitude: 23.236000 * Location: Hanko Peninsula, Finland * Method/Device: Multiple investigations (MULT)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DATE/TIMEDate/TimeVirtasalo, Joonas JGeocode – UTC +3
2LATITUDELatitudeVirtasalo, Joonas JGeocode – ETRS-TM35FIN, decimal degrees
3LONGITUDELongitudeVirtasalo, Joonas JGeocode – ETRS-TM35FIN, decimal degrees
4Radon 222 activity222RnBq/m3Virtasalo, Joonas J3M MiniModule gas contractor, Drierite gas-drying unit and Durridge RAD7 radon detector
55 data points

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