First Amazon Methane budget based in atmospheric long term data provided by aircraft vertical profiles measurements
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2020
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AGU FALL MEETING
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The overall Methane (CH4) budget remains highly uncertain even with the efforts to improve the estimates and contributions of its many sources (natural and anthropogenic) and few sinks. Wetland emissions are considered the primary natural CH4 source but with large uncertainty in estimations. Tropical regions like the Amazon, host some of the largest wetlands areas on the globe. However, these regions are still poorly observed with large-scale integrating observations. Here we present the first long term (2010-2018) atmospheric sampling of the lower troposphere over the Amazon using regular vertical profile (300m to 4.4km height) observations of CH4 and carbon monoxide (CO) at four sites. The sampling was nearly biweekly using small aircrafts, to provide solid seasonal and annual CH4 budgets with large spatial resolution. Was calculated a CO/CH4 ratio to estimate CH4 emissions from biomass burning. An increase in emissions mainly during the dry season at all sites from biomass burning was observed. The results show a regional variation in biogenic CH4 emissions (total minus biomass burning emissions). There are comparably high emissions from the Amazon northeast region (SAN) exhibiting strong seasonality, with particularly high CH4 fluxes one month before (February/March) the wet season peak. The second period of high emissions occurs during the beginning of the dry season (August). In the other three sites (ALF, RBA and TAB_TEF) located further downwind along the main air-stream, it were observed lower emissions, which represents approximately 20-33 % of what was observed in the northeast region and with a clear annual seasonality. Besides, we discuss how these data vary throughout the years and how it can be correlated to climate variables (temperature, precipitation and equivalent water thickness) and with human-driven influence (biomass burning), which both could be impacting this variability and annual seasonality.
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BASSO, LUANA S.; GATTI, LUCIANA V.; MARANI, LUCIANO; CASSOL, HENRIQUE L.G.; TEJADA, GRACIELA; CORREA, SERGIO M.; MILLER, JOHN B.; GLOOR, MANUEL; DOMINGUES, LUCAS G.; ARAI, EGIDIO; SANCHEZ, ALBER; ARAGÃO, LUIZ E.O.C.; CORREIA, CAIO S. de C.; NEVES, RAIANE A.L.; CRISPIM, STEPHANE P. First Amazon Methane budget based in atmospheric long term data provided by aircraft vertical profiles measurements. In: AGU FALL MEETING, December 1-17, 2020, Online. Abstract... Washington, DC, USA: American Geophysical Union, 2020. Disponível em: http://repositorio.ipen.br/handle/123456789/31847. Acesso em: 25 Apr 2024.
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