HR: 09:45h
AN: B51F-08    [Abstracts]
TI: Trends and Patterns in a New Time Series of Natural and Anthropogenic Methane Emissions, 1980-2000
AU: * Matthews, E
EM: ematthews@giss.nasa.gov
AF: NASA Goddard Institute for Space Studies, 2880 Broadway, New York, NY 10025, United States
AU: Bruhwiler, L
EM: Lori.Bruhwiler@noaa.gov
AF: NOAA ESRL GMD, 325 Broadway, Boulder, CO 80305, United States
AU: Themelis, N J
EM: njt1@columbia.edu
AF: Earth Engineering Center, Columbia University, 500 W. 120 St., New York, NY 10027, United States
AB: We report on a new time series of methane (CH₄) emissions from anthropogenic and natural sources developed for a multi-decadal methane modeling study (see following presentation by Bruhwiler et al.). The emission series extends from 1980 through the early 2000s with annual emissions for all countries has several features distinct from the source histories based on IPCC methods typically employed in modeling the global methane cycle. Fossil fuel emissions rely on 7 fuel-process emission combinations and minimize reliance on highly-uncertain emission factors. Emissions from ruminant animals employ regional profiles of bovine populations that account for the influence of variable age- and size-demographics on emissions and are ~15% lower than other estimates. Waste-related emissions are developed using an approach that avoids using of data-poor emission factors and accounts for impacts of recycling and thermal treatment of waste on diverting material from landfills and CH₄ capture at landfill facilities. Emissions from irrigated rice use rice-harvest areas under 3 water-management systems and a new historical data set that analyzes multiple sources for trends in water management since 1980. A time series of emissions from natural wetlands was developed by applying a multiple-regression model derived from full process-based model of Walter with analyzed meteorology from the ERA-40 reanalysis.
DE: 0365 Troposphere: composition and chemistry
DE: 0426 Biosphere/atmosphere interactions (0315)
DE: 0466 Modeling
DE: 0497 Wetlands (1890)
SC: Biogeosciences [B]
MN: 2007 Fall Meeting