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    Author(s): Janaina Braga do Carmo; Michael Keller; Jadson Dezincourt Dias; Plinio Barbosa de Camargo; Patrick Crill
    Date: 2006
    Source: GEOPHYSICAL RESEARCH LETTERS, VOL. 33, L04809, doi:10.1029/2005GL025436,
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (137 B)

    Description

    We sampled air in the canopy layer of undisturbed upland forests during wet and dry seasons at three sites in the Brazilian Amazon region and found that both methane(CH4) and carbon dioxide (CO2) mixing ratios increased at night. Such increases were consistent across sites and seasons. A canopy layer budget model based on measured soil-atmosphere fluxes of CO2 was constructed to estimate ecosystem CH4 emission. We estimate that net CH4 emission in upland forests ranged from 2 to 21 mg CH4 m2 d1. While the origin of this CH4 source is unknown, these ground based measurements are consistent with recent findings based on satellite observations that indicate a large, unidentified source of CH4 in tropical forest regions.

    Publication Notes

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    do Carmo, Janaina Braga; Keller, Michael; Dezincourt Dias, Jadson; Barbosa de Camargo, Plinio; Crill,Patrick. 2006. A source of methane from upland forests in the Brazilian Amazon. GEOPHYSICAL RESEARCH LETTERS, VOL. 33, L04809, doi:10.1029/2005GL025436,

    Keywords

    methane, forests, Brazilian Amazon

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