HR: 08:00h
AN: B51F-01 INVITED    [Abstracts]
TI: Airborne measurements indicate large methane emissions from the Eastern Amazon Basin
AU: * Miller, J B
EM: john.b.miller@noaa.gov
AF: NOAA Earth System Research Laboratory, R/GMD1 325 Broadway, Boulder, CO 80305, United States
AU: * Miller, J B
EM: john.b.miller@noaa.gov
AF: CIRES, University of Colorado, UCB 216, Boulder, CO 80305, United States
AU: Gatti, L V
EM: lvgatti@ipen.br
AF: Insituto de Pesquisas Energéticas e Nucleares, Av. Lineu Pretes, 2242, Sao Paulo, SP 05508-900, Brazil
AU: d'Amelio, M
EM: monicatais@yahoo.com
AF: Insituto de Pesquisas Energéticas e Nucleares, Av. Lineu Pretes, 2242, Sao Paulo, SP 05508-900, Brazil
AU: Crotwell, A
EM: andrew.crotwell@noaa.gov
AF: NOAA Earth System Research Laboratory, R/GMD1 325 Broadway, Boulder, CO 80305, United States
AU: Crotwell, A
EM: andrew.crotwell@noaa.gov
AF: CIRES, University of Colorado, UCB 216, Boulder, CO 80305, United States
AU: Dlugokencky, E J
EM: ed.dlugokencky@noaa.gov
AF: NOAA Earth System Research Laboratory, R/GMD1 325 Broadway, Boulder, CO 80305, United States
AU: Bakwin, P
EM: peter.bakwin@noaa.gov
AF: NOAA Earth System Research Laboratory, R/GMD1 325 Broadway, Boulder, CO 80305, United States
AU: Artaxo, P
EM: artaxo@if.usp.br
AF: Instituto de Física, Universidade de São Paulo, Rua do Matao, Travessa R, 187, Sao Paulo, SP 05508-900, Brazil
AU: Tans, P P
EM: pieter.tans@noaa.gov
AF: NOAA Earth System Research Laboratory, R/GMD1 325 Broadway, Boulder, CO 80305, United States
AB: Recent results from laboratory, field and remote sensing measurements suggest the presence of large methane emissions from the Amazon basin. In this talk, we will present regionally integrative, direct trace gas observations from two sites that confirm the presence of large fluxes of methane in eastern Amazonia. Air samples collected on aircraft near Santarem (2.9 deg. S, 55.0 deg W) and Manaus (2.6 deg S, 60.0 deg W) in eastern and central Amazonia 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. Based on data from 2000 – 2007, we calculate emissions averaging 27 mg CH₄/m²/day from upwind sources. This estimate is substantially larger than "bottom- up" source estimates for individual sources likely to be contributors. Our measurements represent a substantial gradient between South America and adjacent oceans and a tropical bulge in the global north-south methane gradient that are not captured by sampling sites in the marine boundary layer.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0312 Air/sea constituent fluxes (3339, 4504)
DE: 0315 Biosphere/atmosphere interactions (0426, 1610)
DE: 0414 Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912)
DE: 0497 Wetlands (1890)
SC: Biogeosciences [B]
MN: 2007 Fall Meeting