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Showing content from https://doi.org/10.1111/j.1600-0889.2010.00494.x below:

Continuous measurements of methane from a tower network over Siberia

• M. Sasakawa
• K. Shimoyama
• T. Machida
• N. Tsuda
• H. Suto
• M. Arshinov
• D. Davydov
• A. Fofonov
• O. Krasnov
• T. Saeki
• Y. Koyama
• S. Maksyutov

We have been conducting continuous measurements of Methane (sCH₄) concentration from an expanding network of towers (JR-STATION: Japan–Russia Siberian Tall Tower Inland Observation Network) located in taiga, steppe and wetland biomes of Siberia since 2004. High daytime means (>2000 ppb) observed simultaneously at several towers during winter, together with in situ weather data and NCEP/NCAR reanalysis data, indicate that high pressure systems caused CH₄ accumulation at subcontinental scale due to the widespread formation of an inversion layer. Daytime means sometimes exceeded 2000 ppb, particularly in the summer of 2007 when temperature and precipitation rates were anomalously high over West Siberia, which implies that CH₄ emission from wetlands were exceptionally high in 2007. Many hot spots detected by MODIS in the summer of 2007 illustrate that the contribution of biomass burning also cannot be neglected. Daytime mean CH₄ concentrations from the Siberian tower sites were generally higher than CH₄ values reported at NOAA coastal sites in the same latitudinal zone, and the difference in concentrations between two sets of sites was reproduced with a coupled Eulerian–Lagrangian transport model. Simulations of emissions from different CH₄ sources suggested that the major contributor to variation switched from wetlands during summer to fossil fuel during winter.

Submitted on Dec 28, 2009

Accepted on Jul 6, 2010

Published on Jan 1, 2010

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