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Airborne measurements indicate large methane emissions from the eastern Amazon basin
NOAA Earth System Research Laboratory, Boulder, Colorado, USA
Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA
Divisao de Quimica Ambiental, Laboratorio de Quimica Atmosferica, Insituto de Pesquisas Energéticas e Nucleares, São Paulo, Brazil
Divisao de Quimica Ambiental, Laboratorio de Quimica Atmosferica, Insituto de Pesquisas Energéticas e Nucleares, São Paulo, Brazil
NOAA Earth System Research Laboratory, Boulder, Colorado, USA
Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA
NOAA Earth System Research Laboratory, Boulder, Colorado, USA
NOAA Earth System Research Laboratory, Boulder, Colorado, USA
Instituto de Física, Universidade de São Paulo, São Paulo, Brazil
NOAA Earth System Research Laboratory, Boulder, Colorado, USA
Recent results from laboratory, field and remote sensing measurements suggest the presence of large methane emissions from the Amazon basin. Here we present regionally integrative, direct trace gas observations from two sites that confirm the presence of large fluxes of methane in eastern Amazônia. Air samples collected on aircraft near Santarém (2.9°S, 55.0°W) and Manaus (2.6°S, 60.0°W) in eastern and central Amazônia show large enhancements of CH4 that are not seen at the NOAA/ESRL background sites in the tropical Atlantic Ocean. From the surface to about four km, enhancements averaging 34 ppb and up to 200 ppb occur throughout the year and we calculate emissions averaging 27 mg CH4/m2/day from upwind sources.
Received 27 December 2006; accepted 24 April 2007; published 25 May 2007.
Citation: (2007), Airborne measurements indicate large methane emissions from the eastern Amazon basin, Geophys. Res. Lett., 34, L10809, doi:10.1029/2006GL029213.
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