HR: 1340h
AN: B53A-0938    [Abstracts]
TI: The isotope signature of methane emitted from plant matter upon irradiation with UV light
AU: * Vigano, I
EM: i.vigano@phys.uu.nl
AF: Institute of Marine and Atmospheric Research Utrecht, Utrecht University Princetonplein 5, Utrecht, 3584CC, Netherlands
AU: Holzinger, R
EM: r.holzinger@phys.uu.nl
AF: Institute of Marine and Atmospheric Research Utrecht, Utrecht University Princetonplein 5, Utrecht, 3584CC, Netherlands
AU: Röckmann, T
EM: t.roeckmann@phys.uu.nl
AF: Institute of Marine and Atmospheric Research Utrecht, Utrecht University Princetonplein 5, Utrecht, 3584CC, Netherlands
AB: New experiments show that dry and fresh leafs and other plant matter, as well as several structural plant components, emit methane upon irradiation with UV light and heating. We have determined the carbon and hydrogen isotopic composition of the produced methane in an experimental setup where plant matter is irradiated with UV light or heated in a quartz reactor. CH4 concentration, emission rate and isotopic composition are determined by measurements using an optical absorption technique (cavity ringdown spectroscopy), gas chromatography and isotope ratio mass spectrometry. We will present the source isotope signatures of the methane emitted from a range of natural plant materials. If the aerobic methane source from plants is indeed large, this has to be included in global isotope budgets.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0315 Biosphere/atmosphere interactions (0426, 1610)
DE: 0365 Troposphere: composition and chemistry
DE: 0414 Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912)
DE: 0454 Isotopic composition and chemistry (1041, 4870)
SC: Biogeosciences [B]
MN: 2007 Fall Meeting