Major Research Issues
Monitoring of freshwater and climate research
Short Technical Description
The Lake Langtjern buoy measures water temperature using a thermocouple at 8 different depths (0.5m, 1m, 1.5 m, 2m, 3m, 4m, 6m, 8m). Oxygen saturation is measured with a Aanderaa Optode 4175 at depths of 1m and 8m. At the lake outlet temperature is measured in air, water and soil (10 cm) using a thermocouple. pH is measured with a Honeywell Durafet II and conductivity with a Honeywell graphite electrode, both having a direct line transmitter (4-20 mA). Water level is measured with a pressure cell. Coloured dissolved organic matter (CDOM) is measured with a TriOS Microflu-CDOM (ex 370nm/em 460nm) (D, small sensor) and UV-absorption with a TriOS ProPS (190-360 nm) (D, large sensor) with a 1 cm light path.
Both have mechanical wipers to remove biofilm. Additionally water flow is measured at the inlet LAE03. A new weather station was installed at Langtjern in November 2012, replacing a station from 2011. Air temperature and relative humidity is measured using a Campbell Scientific CD215. Global radiation with a Apogee SP-212 sensor. A Young Model 05103-5 measures wind speed and direction. In addition a web camera is installed at the station (Campbell Scientific CC5MPX). A sensor monitoring precipitation (Geonor T-200B) will be installed at the station in the near future. For power generation in this remote area solar panels and a methanol fuel cell have been installed. A small cabin is set up by the outlet to house various instruments.
Specific Features
The catchment has not been disturbed by any direct human interference since early in the 20th century.
Options And Conditions
Please enquire for more information.
Unit Cost Of Use
On demand
Contact Content
Dr. Heleen De Wit
Research Manager
Phone: +47 954 34 360
Email: heleen.de.wit@niva.no