Geo-Marine Letters

, Volume 24, Issue 2, pp 75–85

Hydroacoustic experiments to establish a method for the determination of methane bubble fluxes at cold seeps


DOI: 10.1007/s00367-003-0165-7

Cite this article as:
Greinert, J. & Nützel, B. Geo-Mar Lett (2004) 24: 75. doi:10.1007/s00367-003-0165-7


Hydroacoustic methods are particularly suitable for investigations of the occurrence, cyclicity and amount of bubbles released at cold seeps without disturbing them. Experiments with a horizontally looking single beam transducer (40 and 300 kHz) directed towards artificially produced bubbles show that the backscattering strength of the bubbles increases with the gas flux rate independently of the bubble radii distribution. It is demonstrated that an acoustic system can be calibrated in such a way that gas flux rates of bubble-size spectra, as observed at natural seeps, can be directly related to the echo level of a known, acoustically insonified volume. No system-specific parameters have to be known except the beam width.

Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  1. 1.Leibniz-Institute of Marine Sciences (IFM-GEOMAR)24148 KielGermany
  2. 2.Federal Armed Forces Underwater Acoustics and Marine Geophysics Research Institute24148 KielGermany

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