Quantifying the decrease in anthropogenic methane emissions in Europe and Siberia using modeling and atmospheric measurements of carbon dioxide and methane.

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Presentation transcript:

Quantifying the decrease in anthropogenic methane emissions in Europe and Siberia using modeling and atmospheric measurements of carbon dioxide and methane from Alert, Canada. D. Worthy 1, E. Chan 1, M. Ishizawa 1, D. Chan 1 & P. Bergamaschi 2 & I. Levin 3 1) Environment Canada, 4905 Dufferin Street, Toronto, Canada 2) Climate Change Unit Institute for Environment and Sustainability (IES) Joint Research Centre European Commission Ispra, Italy 3) Institut für Umweltphysik, University of Heidelberg (UHEI-IUP), Heidelberg, Germany

Canada’s GHG Air Sampling Network In situ and flask CO, CO 2, CH 4, N 2 O, SF 6; Flask H 2, and CO 2 isotopes Flask CO, CO 2, CH 4, N 2 O, H 2, SF 6 & CO 2 isotopes only (Estevan Point) Proposed CCP and IPY sites Aircraft vertical profiles (NOAA) Alert CO 2 Alert CH 4 Dr. Neil Trivett Global Atmosphere Watch Observatory

Alert CO 2 - Dec-Feb Alert CH 4 - Dec-Feb Day Time Series

1989/ /1998 Ratio of CH 4 to CO 2 (Long-term trend & seasonality removed)

Model Simulations (9 regions and 11 emission sources ) P. Bergamaschi et al. (2006: Satellite cartography of atmospheric methane by extending the CH 4 dataset retrieved from SCIAMACHY & inverse model simulations for 2003 (using NOAA flask CH 4 measurements & TM5 transport model).

Atmospheric CH 4 at Alert is simulated using the NIES atmospheric transport model and NCEP reanalysis meteorology

Relative CH 4 contribution by region In situ/model CH 4 comparison Jan. 1 to Feb

Western Siberia Temperate Asia Europe

Modeled CH 4 /CO 2 comparison

Western Siberian CH 4 source change of 3.4 Tg/yr changes the ratio by 1 ppb/ppm If change occurs only in Western Siberia this would result in a 14 Tg/yr source change European CH 4 source change of 8.36 Tg/yr changes the ratio by 1 ppb/ppm If change occurs only in Europe this would result in a 33 Tg/yr source change

[M*kg/grid] Change in anthropogenic CH 4 emissions: (source: EDGAR)

Change in anthropogenic CH 4 emissions (source: EDGAR) Europe (-14 Tg/yr) Energy : -8.1 Animal : -5.3 Waste : -0.5 W. Siberia (-2 Tg/yr) Energy : -1.6 Animal : -0.5 Waste : 0.02 E. Siberia (-0.08 Tg/yr) Energy : Animal : 0.02 Waste : 0.02 [M*kg/grid]

Summary : 1.The time series of CH 4 /CO 2 ratios at Alert observatory during well-defined episodes primarily originating from Siberian and/or European source regions dropped by ~ 40% from 1988 to Time series of modelled CH 4 /CO 2 ratios (using the NIES atmospheric transport model and NCEP reanalysis meteorology, along with annual reported CO 2 sources and individual CH 4 sources for 2003) showed no change over the same time period. 3.Partitioning the simulated CH 4 events into contributions by region showed that on average, fossil fuel emissions from Europe accounted for more than 50% of the signal with Western Siberia having the 2 nd largest contribution 4.To reproduce the trend in the ratio of CH 4 /CO 2 observed in the data requires a reduction in emissions of CH 4 on the order of 14 to 33 Tg/yr, depending on the regions contributing to this decrease. 5.If the EDGAR emissions changes for Europe of 14 Tg/yr are correct our analysis suggests a emissions change for Western Siberia of 7 Tg/yr. 6.If the Bousquet et al. estimate (see Poster) of emissions changes for Europe of about 30 Tg/yr is correct our data would agree and Edgar would be wrong by a factor of two 7.Study is still on-going.