Physics
Scientific paper
Oct 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.4377h&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 58, Issue 20, pp.4377-4388
Physics
12
Scientific paper
This study reports the first measurements of the 13 C of CH 4 emitted from seasonally flooded swamp forests in the southeastern United States. The seasonally averaged 13 C of CH 4 emitted from a north Florida swamp forest located in the St. Marks National Wildlife Refuge was -52.7 ± 6.11%. (error is ± one standard deviation throughout, n = 28), a value 13 C-enriched, relative to typical wetland emissions. In an Everglades cypress dome, the average 13 C of emitted CH 4 was -52.5 ± 6.7%.( n = 3). Consistent with attenuation of CH 4 emission by CH 4 oxidation in these environments, CH 4 emitted via diffusion from the St. Marks swamp forest was enriched in 13 C by 6.4 ± 5.8%. ( n = 28) and D by 57 ± 36%. ( n = 6) relative to sedimentary CH 4 . Methane emitted from the cypress dome had also been altered by oxidation, as it was enriched in 13 C by 12.1 ± 4.3%. relative to sedimentary CH 4 . Emission experiments, performed in situ with inhibitors of aerobic CH 4 oxidizing bacteria, were used to calculate the fractionation factors ( ) for stable carbon and hydrogen isotopes of CH 4 undergoing transport and oxidation. Values ranged from 1.003 to 1.021 and 1.050 to 1.129, respectively. The best estimates for carbon and hydrogen values were 1.020 and 1.068, respectively. The values of produced (sedimentary) CH 4 were relatively constant in the St. Marks subtropical swamp forest. Additionally, because the transport of CH 4 to the atmosphere was dominated by molecular diffusion, variations in the magnitude of CH 4 oxidation appeared to be the primary factor controlling the values of emitted CH 4 . This contrasts with systems dominated by bubble ebullition, where variations in CH 4 production mechanisms have been hypothesized to be the primary factor controlling the values of emitted CH 4 .
Chanton Jeffrey P.
Happell James D.
Showers William S.
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