Regional variability in Amazon methane emissions based on lower-troposphere observations
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2022
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EGU General Assembly
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After a period where atmospheric methane (CH4) levels were nearly steady, its levels have been
rapidly raising since 2007, but the main reasons remains uncertain. Increases in wetlands
emissions could be one possible reason, mainly at tropical regions like Amazonia, which host some
of the largest wetlands/seasonally flooded areas on the globe. Based on 590 lower troposphere
vertical profiles of CH4 and carbon monoxide (CO) observations over four sites at Amazon (at the
northeast, southeast, northwest-central and southwest-central regions) we estimated that Amazon
region contributes with 8% of global CH4 emissions, and wetlands are the mainly CH4 source to the
atmosphere (Basso et al., 2021). Vertical profiles are sampled using light aircraft, high-precision
greenhouse gas and CO analysis of flask air, fortnightly between 2010 and 2018. We observed an
unexpected east-west gradient in CH4 emissions, with higher emissions in northeast Amazon
region. The higher emissions are mainly from wetlands and are not explained by biomass burning
and anthropogenic emissions (like enteric fermentation), but its causes remains unclear. In the
other three sites located further downwind along the main air-stream the CH4 emissions
represents approximately 24-36% of what is observed in the northeast region. Our wetlands
emission estimates of each region were compared to analogous fluxes from the WetCharts
wetland model ensemble (Bloom et al., 2017). The estimates were similar except for the northeast
region, where WetCharts does show substantial emissions, but still just 40% of our estimates
based on the lower troposphere observations (Basso et al., 2021).
Como referenciar
BASSO, LUANA; GATTI, LUCIANA; MARANI, LUCIANO; MILLER, JOHN; GLOOR, MANUEL; MELACK, JOHN; CASSOL, HENRIQUE; TEJADA, GRACIELA; DOMINGUES, LUCAS; ARAI, EGIDIO; SANCHEZ, ALBER; CORREA, SERGIO; ANDERSON, LIANA; ARAGAO, LUIZ; CORREIA, CAIO; CRISPIM, STEPHANIE; NEVES, RAIANE. Regional variability in Amazon methane emissions based on lower-troposphere observations. In: EGU General Assembly, May 23-27, 2022, Vienna, Austria. Abstract... Göttingen, Germany: Copernicus, 2022. Disponível em: http://repositorio.ipen.br/handle/123456789/33252. Acesso em: 20 Apr 2024.
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.