Currents and CTD measurements data in the vicinity of Keri Island in 2018

Data description of currents and temperature and salinity profiles in the vicinity of Keri Island in the Gulf of Finland in the Baltic Sea in summer/autumn 2018.

Oceanographic measurements, encompassing currents, water temperature, and salinity, were conducted at two proximate locations near Keri Island. The bottom-mounted ADCP (Acoustic Doppler Current Profiler, Workhorse Sentinel, Teledyne RDI, 300 kHz) measured current profiles for two months, from August to September 2018, at the KeriN measurement station, approximately 2 km north of Keri Island. Simultaneously, temperature and salinity profiles were recorded for nearly one month by a bottom-mounted autonomous CTD profiler (Flydog Solutions) at the KeriN from 26 July 2018 to 17 August 2018. CTD (Conductivity, Temperature, Depth) profiles were recorded from 3 to 98 meters at 3-hour intervals and ADCP data from 8 to 106 meters at 1-hour intervals. The horizontal separation between the locations of CTD and ADCP profilers was 60 m.

The bottom-mounted RDCP (Recording Doppler Current Meter, Aanderaa Data Instruments AS) measured current profiles for one month, spanning 28 August to 2 October 2018, at the KeriS measurement station, approximately 1.1 km east of the island. Simultaneously, temperature and salinity profiles were obtained for two months by a buoy-mounted automatic CTD profiler (Idronaut) at the KeriS from 28 August 2018 to 5 October 2018. CTD data, available at 6-hour intervals, covered depths from 2 to 44 meters, and RDCP data spanned depths from 6.8 to 42 meters at 1-hour intervals. The separation between the locations of CTD and RDCP profilers was 300 m.

High-resolution wind data for the measurement period were obtained from the Tallinnamadal Lighthouse, about 20 km west of the measurement site. Wind speed and direction sensors (Aanderaa) at a height of 31 m recorded data every 5 minutes.