Seasonality and interannual variability of CHsub(4) fluxes from the eastern Amazon Basin inferred from atmospheric mole fraction profiles
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Journal of Geophysical Research: Atmospheres
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The Amazon Basin is an important region for global CH4 emissions. It hosts the largest area of
humid tropical forests, and around 20% of this area is seasonally flooded. In a warming climate it is possible
that CH4 emissions from the Amazon will increase both as a result of increased temperatures and precipitation.
To examine if there are indications of first signs of such changes we present here a 13 year (2000–2013)
record of regularly measured vertical CH4 mole fraction profiles above the eastern Brazilian Amazon, sensitive
to fluxes from the region upwind of Santarém (SAN), between SAN and the Atlantic coast. Using a simple
mass balance approach, we find substantial CH4 emissions with an annual average flux of 52.8 ± 6.8 mg
CH4 m 2 d 1 over an area of approximately 1 × 106 km2
. Fluxes are highest in two periods of the year: in the
beginning of the wet season and during the dry season. Using a CO:CH4 emission factor estimated from
the profile data, we estimated a contribution of biomass burning of around 15% to the total flux in the dry
season, indicating that biogenic emissions dominate the CH4 flux. This 13 year record shows that CH4
emissions upwind of SAN varied over the years, with highest emissions in 2008 (around 25% higher than in
2007), mainly during the wet season, representing 19% of the observed global increase in this year.
Como referenciar
BASSO, LUANA S.; GATTI, LUCIANA V.; GLOOR, MANUEL; MILLER, JOHN B.; DOMINGUES, LUCAS G.; CORREIA, CAIO S.C.; BORGES, VIVIANE F. Seasonality and interannual variability of CHsub(4) fluxes from the eastern Amazon Basin inferred from atmospheric mole fraction profiles. Journal of Geophysical Research: Atmospheres, v. 121, n. 1, p. 168-184, 2016. Disponível em: http://repositorio.ipen.br/handle/123456789/25774. Acesso em: 30 Jun 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.