Пространственно-временная изменчивость содержания метана в Севастопольской бухте и его эмиссии в атмосферу

Concentrations of methane (CH4) in marine water of the Sevastopol Bay were measured during different seasons of 2017–2018 and its emissions from water to the atmosphere were calculated. The CH4 content in water was measured by headspace method using the HP 5890 gas chromatograph. The CH4 surface concentration varied over a wide range, from 2 to 210 nmol L–1, and the CH4 saturation level was 61 to 6814% as compared to the equilibrium values. It was found that CH4 concentration depends on the season. The lowest values were found in June, and the highest in November. The water of Sevastopol Bay appeared to be a source of CH4 for the atmosphere during the whole period of survey averaging from 17 to 112 µmol m–2 a day. The estimated time of dissolved methane emission turnover in the Sevastopol Bay ranges from 12 to 37 days.