METHANE EMISSIONS FROM THERMOKARST LAKES IN THE SOUTHERN TUNDRA OF WESTERN SIBERIA

Lakes are an important natural source of methane – significant greenhouse gas of the modern atmosphere. Monitoring of methane emission from lakes ofnorthern territoriesis needed to update the available estimates of CH4 emission intensity into the atmosphere and to obtain multi-year series of observa...

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Bibliographic Details
Published in:GEOGRAPHY, ENVIRONMENT, SUSTAINABILITY
Main Authors: Vladimir S. Kazantsev, Liudmila A. Krivenok, Maria Yu. Cherbunina
Format: Article in Journal/Newspaper
Language:English
Published: Lomonosov Moscow State University 2018
Subjects:
greenhouse gases
fluxes
methane
freshwater ecosystems
polar regions
geo
envir
nenets
Thermokarst
Tundra
Yamalo Nenets
Siberia
Online Access:https://doi.org/10.24057/2071-9388-2018-11-1-58-73
https://doaj.org/article/87b90ee069a342f49e00366fa1b7e110
Description
Summary:Lakes are an important natural source of methane – significant greenhouse gas of the modern atmosphere. Monitoring of methane emission from lakes ofnorthern territoriesis needed to update the available estimates of CH4 emission intensity into the atmosphere and to obtain multi-year series of observations. Field measurements of diffuse methane fluxes were carried out on lakes at different stages of thermokarst process located in Yamalo-Nenets Autonomous District (Western Siberia, Russia) during summer 2016 using static chamber method. Some statistical characteristics of measured fluxes were calculated (medians vary from 0.46 to 0.93 mgC-CH4∙m ∙h ), as well as annual diffuse emissions from studied lakes, which values are determined by the area of the lake’s water surface. Daily dynamics of methane fluxes were defined and approximation of fluxes with simple model was done, major factors are temperatures of lake bottom and of the surface air layer.

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