Methane Fluxes in West Siberia: 3-D Regional Model Simulation |
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| Authors: | Jagovkina S V Karol I L Zubov V A Lagun V E Reshetnikov A I Rozanov E V |
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| Institution: | (1) Main Geophysical Observatory, St.-Petersburg, Russia;(2) Arctic and Antarctic Research Institute, St.-Petersburg, Russia;(3) Research Centre for Atmospheric Remote Sensing, St.-Petersburg, Russia;(4) University of Illinois at Urbana-Champaign, Urbana, U.S.A |
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| Abstract: | The West Siberian region is one of the main contributors of theatmospheric greenhouse gas methane due to the large areas ofwetlands, rivers, lakes and numerous gas deposits situated there.But there are no reliable estimations of integral methane flux fromthis area into the atmosphere. For assessment of methane fluxes inWest Siberia the specially constructed 3-D regional chemicaltransport model was applied. The 3-D distribution of methane iscalculated on the basis of the current meteorological data fields(wind, temperature, geopotential) updated 4 times a day. The methaneconcentrations measured near the main gas fields of West Siberia inthe summer season of 1999, were used for correction of methane fluxintensity estimates obtained previously by comparison ofmeasurements carried out in summer 1993 and 1996 with modelledmethane mixing ratio distribution. This set of field and modelexperiments confirmed the preliminary conclusion about low leakageintensity: anthropogenic methane flux does not exceed 5–15% oftotal summer methane flux, estimated as 11–12 Mt CH4 in summer from this region, in spite of the large areas of gas deposits located there. |
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| Keywords: | 3-D regional modelling methane emissions wetland and anthropogenic sources |
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