Regional Oceanographic Database
The measurement data presented in this index can be divided into several groups:
- depending on the way of measuring: stationary data (stations) and transects;
- depending on the topic: biology, sea bottom and gas bubbles(in polish);
- depending on the location: the Baltic Sea, Arctics (Spitsbergen, the Norwegian Sea) and Antarctics (the Southern Atlantic) ;
- depending on the methodology: single and multiple frequency (chirp-sonar, boomer);
calibration data.
Majority of our experimental research is based on the measurement of backscattered acoustic signals (echosignals or volume reverberation) by means of
different equipment, among it the echosounders SIMRAD, ATLAS-KRUPP or HONEYWELL-ELAC working at frequencies from 30 till 200 kHz. The sampled (digitised) echo envelopes are recorded on computer disc. Knowledge of the fundamental acoustic parameter - the backscattering strength - and its temporal and spacial distributions allows to determine different environmental parameters: biomass distribution, structure of the scattering layers, gas bubble concentrations, acoustic properties of the sea bottom. Each of the mentioned tasks requires the specialised methods of signal processing (automatic ellimination of disturbances, filtration, averaging, echo integration). Data were collected during several cruises and in the experimental tank.
This paper was made by:
M.Sc.Eng. Kazimierz Groza, Prof. Zygmunt Klusek, Dr Joanna Szczucka, Dr Jarosław Hrabia Tęgowski and M.Sc. Krzysztof Poraziński
Krzysztof Porazinski <kpp@iopan.gda.pl>, 02.03.1996
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