First HYPOX observatory deployed in the Koljö Fjord area, Sweden

Per Hall, Anders Tengberg, and coworkers from the HYPOX team at Gothenburg University (UGOT) deployed the first HYPOX observatory in the Havstens Fjord. Havstens Fjord is located in the Koljö Fjord area and supplies the Koljö Fjord with water. After successful testing in October 2009 a string type observatory was deployed on 3.11.2009. The deployment is planned to continue until at least March 2010.
The string observatory hosts three oxygen optodes and four sensors for conductivity (salinity) distributed at water depths between 6 and 18m. At the lower end of the string (at ca 25 m water depth) there is a recording current meter (“Seaguard”, AADI, Norway), measuring currents and pressure (depth and sea level change), and logging all sensor data. Temperature is measured at all depths. For future deployments, a total of fourteen sensors can be connected to the string at seven different depths at a vertical distance of 3m. To prevent damage from ice cover in winter the string is deployed without surface buoy.


The string-type observatory on deck of the UGOT R/V Skagerak just before deployment (photo: Per Hall, UGOT).