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The "Aqua Alta" Oceanographic Tower (AAOT), located in the North Adriatic Sea, is used to perform optical and bio-geo-chemical measurements. The three AAOT deployment systems were designed to support activities for the development and validation of ocean colour products derived from satellite imagery.

The VDS is a multi-sensor deployment system that since 1995 is used to collect profiles of optical, bio-geological and physical data from a fixed point close to the AAOT. The LDDS was designed to ensure an easy deployment of free-falling profilers at a selectable distance from the AAOT. Its major advantage is the possibility of fully controlling its deployment point under any sea state condition. A disadvantage is the tilt that may affect optical measurements when strong currents act on the profiler. The HDS major feature is to ensure the deployment of a sensor pack of around 10kg up to a distance of 12m from the main AAOT superstructure using a tubular horizontal mast sliding within fixed supports.

Additional information

Authors: VAN DER LINDE D W, European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra, (IT)
Bibliographic Reference: EUR 20548 EN (2003), pp.13. Free of charge
Availability: Available from European Commission, JRC Knowledge Management Unit, Ispra (IT) Tel: +39 033278 9843 or +39 033278 9864 Fax: +39 033278 9623 E-mail:
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