Mapping Deep-Water Gas Emissions With Sidescan Sonar

Physics – Geophysics

Scientific paper

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Marine Geology And Geophysics: Seafloor Morphology, Geology, And Geophysics, Marine Geology And Geophysics: Gas And Hydrate Systems

Scientific paper

Emissions of methane gas from cold seeps on the seafloor have a strong impact on a number of biogeochemical processes. These processes include the development of deep-sea benthic ecosystems via the process of anaerobic oxidation of methane [Boetius et al., 2000] or the precipitation of carbonates [Ritger et al., 1987]. The fluxes of other chemical species associated with methane emissions may even influence the chemical composition of seawater [Aloisi et al., 2004]. Such gas emissions may have been much more intensive in the past with a strong impact onglobal climate [Dickens, 1999], as suggested bycarbon isotope data. Many international and national research projects, such as the METRO collaborative project (Methane and Methane Hydrates Within the Black Sea: Structural Analyses, Quantification and Impact of a Dynamic Methane Reservoir), part of the German research and development program Geotechnologien, focus on these cold seep sites and stimulate interdisciplinary work between a variety of scientific groups.

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