Spatio-temporal dynamics of methane content in the Sevastopol Bay and its emission to the atmosphere
Abstract
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.
Keywords
methane,
emission into the atmosphere,
stratification,
headspace method,
gas chromatography,
Sevastopol Bay,
Black Sea
Supporting agencies: The study was carried out under the state task «Molismological and biogeochemical bases of marine ecosystems homeostasis» of A.O. Kovalevsky Institute of Biology of Southern Seas of the RAS (state registration number АААА-А18-118020890090-2).
About the Authors
T. V. Malakhova
A.O. Kovalevsky Institute of Biology of Southern Seas of the RAS
Russian Federation
Senior Scientific Researcher, PhD. in Biology
Russian Federation
Senior Scientific Researcher, PhD. in Biology
L. V. Malakhova
A.O. Kovalevsky Institute of Biology of Southern Seas of the RAS
Russian Federation
Leading Scientific Researcher, PhD. in Biology
Russian Federation
Leading Scientific Researcher, PhD. in Biology
A. A. Budnikov
Lomonosov Moscow State University
Russian Federation
Department of Physics, Senior Scientific Researcher, PhD. in Physics and Mathematics
Russian Federation
Department of Physics, Senior Scientific Researcher, PhD. in Physics and Mathematics
I. N. Ivanova
Lomonosov Moscow State University
Russian Federation
Department of Physics, Senior Scientific Researcher, PhD. in Physics and Mathematics
Russian Federation
Department of Physics, Senior Scientific Researcher, PhD. in Physics and Mathematics
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Review
For citations:
Malakhova T.V., Malakhova L.V., Budnikov A.A., Ivanova I.N. Spatio-temporal dynamics of methane content in the Sevastopol Bay and its emission to the atmosphere. Vestnik Moskovskogo universiteta. Seriya 5, Geografiya. 2020;(3):73-80. (In Russ.)
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