METHANE EMISSION TO THE HYDRO- AND ATMOSPHERE BY GAS BUBBLE STREAMS IN THE DNIEPER PALEO-DELTA, THE BLACK SEA
Keywords:
gas bubble streams, methane flux, Dnieper paleo-delta, Black SeaAbstract
To estimate methane flux from natural gas bubble streams (seepages) a combined approach was applied, inclusive of detailed echo survey of investigated area and data analysis with the use of specialized software, GIS technique and mathematic simulation. A precise location map of methane seepages in the Dnieper paleo-delta region was obtained. In total 2200 seepages were identified at the investigated area of 387.1 km2, which release 16.74 106 m3 at atmospheric pressure (STP), or 12.0 10-3 teragram (Tg) methane a year. Statistical distribution of individual seepage methane flux rates conforms to the lognormal law. We found that 1.9% of methane from gas bubble streams reaches the atmosphere in gas phase, while 98.1% dissolves in the water column. Thus, the most part of methane remains in sea water and enters into physical, chemical and biological transformation processes of carbon-containing compounds.
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