Detailed gasometric investigations in the Kara Sea (August - September
, 1993) in the 49-th cruise of the R/V ''Dmitriy Mendeleev'' provided
to discover a methane plume for the first time in the water column of
the Baidara Guba (Bay). Peculiarities of methane content distribution
in the mixed zones of marine and Ob and Yenisei river waters were stud
ied. Large gradients of methane concentrations in the sediments indica
te the presence of hydrocarbon fluxes.