Lake Page of EMU
Development of this webpage is supported by the EU through the European Regional Development Fund, programme "Research Internationalisation" project LIMNO (3.2.0601.11- 0001). Data collection is supported by the EU through the European Regional Development Fund, Environmental Conservation and Environmetntal Technology R&D Programme project VeeOBS (3.2.0802.11-0043).
Please read before proceeding:
Attention! Raw data. The data is provided as it is automatically received from the sensors without quality control, warranty or condition of any nature. EMU does not warrant the quality, accuracy, or completeness of any information, data or product from these web pages.
If you want to use the data from this website or need a wider acess to the data, please contact Alo.Laas@emu.ee
Estonian lakes equipped with automated buoy systems are site members of the Global Lake Ecological Observatory Network. GLEON is a world-wide grassroots network of people, institutions, programs, and data dedicated to understanding, predicting, and communicating the impact of natural and anthropogenic influences on lakes.
Lake Võrtsjärv automatic weather station was established in late 2009 on the pier of the Centre for Limnology (N 58.211151, E 26.108136). The original station contaied Vaisala Weather Transmitter WXT520 and Star Pyranometer 8101. and the data collection was controlled with a Gealog SG Alphanumeric (V1.0) data logger.
At the end of 2018 the station was renovated. Current measurements are done by Airmar 200WX weather station and Star Pyranometer 8101 and the data collection is controlled by the Flydog Marine datalogger. Parameters collected at 5-minutes intervals include: air temperature, air pressure, humidity, wind speed and direction, and solar irradiance.
Lake Võrtsjärv Buoy was deployed in the summer of 2010 near the deepest point of the lake (N 58.211798, E 26.103163) to gather high resolution data on meteorology and water quality of the lake. YSI EMM 700 bay buoy has been used for float. YSI 6600 V2-4 multisonde (at 1 meter) and two Li-Cor (LI-192) underwater PAR sensors were fixed at 0.5 and 1 meter depth for underwater measurements.
The buoy is equipped with a Vaisala Weather Transmitter WXT520 and a Li-Cor pyranometer (LI-200) for weather parameters. Data collection was controlled with Campbell CR1000 datalogger. System was renewed in 2021. Current underwater measurements are collected with EXO2 multisond and data collection is controlled by Flydog Marine datalogger.
Collected parameters include: water temperature, dissolved oxygen saturation, chlorophyll fluorescence, phycocyanin fluorescence, pH, conductivity, turbidity, air temperature, air pressure, humidity, precipitation, wind speed and direction, and solar radiation. All parameters are collected at 10 minutes interval.
Lake Saadjärv profiling buoy was established in summer 2015 (N 58.295689, E 26.421284) to gather high resolution data on meteorology and water quality of the lake. Flydog Marine coastal profiler „Oscar“ collects underwater data with EXO2 multisonde form 2 to 20 meters depths.
Collected parameters include: water temperature, dissolved oxygen saturation, chlorophyll fluorescence, phycocyanin fluorescence, pH, conductivity, turbidity and fDOM data. All parameters are collected at 30 minutes interval.
Lake Saadjärv profiling buoy is also equipped with an Airmar 200WX weather station and a Li-Cor quantum sensor (LI-190SZ) for weather parameters. Measurements for air temperature, air pressure, humidity, wind speed and direction, and PAR are collected at 1 minutes interval.
Lake Põrmujärv buoy station was installed on the water body in May 2024 (N57.877630, E 26.961661). The automatic station is used on the lake during the ice-free period.
For in-water measurements, sensors from the French company AQUALABO (earlier Ponsel) are mounted on the buoy. At a depth of 0.5 meters water pH, temperature, dissolved oxygen and turbidity is recorded; at a depth of 1.5 meters, changes in water temperature and dissolved oxygen are collected over time. The sensors measure every 30 minutes. On the website you can see the measurements of the selected parameters at different depths.
Lake Põrmujärv buoy is also equipped with an Airmar 200WX multiweather station for weather parameters. Measurements for air temperature, air pressure, humidity, wind speed and direction are collected at every 2 minutes intervals.
The automated environmental data collection in Lake Põrmujärv is funded by the Estonian- Latvian Interreg project BioFloat. The aim of the project is to improve biodiversity and the health of aquatic ecosystems in the urban environment. This will be done by carefully developing and testing three new green infrastructure elements, as well as by actively involving target groups in Latvia and Estonia. More detailed information about the BioFloat project can be found here - BioFloat - Floating islands as biodiversity pit stops and pollution cutouts towards more resilient cities (BioFloat) - LHEI