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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Seasonality and interannual variability of CH4 fluxes from the eastern Amazon Basin inferred from atmospheric mole fraction profiles

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Basso, Luana S. [1] ; Gatti, Luciana V. [1] ; Gloor, Manuel [2] ; Miller, John B. [3] ; Domingues, Lucas G. [1] ; Correia, Caio S. C. [1] ; Borges, Viviane F. [1]
Total Authors: 7
[1] Comissao Nacl Energia Nucl, Inst Pesquisas Energet & Nucl, Atmospher Chem Lab, Sao Paulo - Brazil
[2] Univ Leeds, Sch Geog, Leeds LS2 9JT, W Yorkshire - England
[3] NOAA, Global Monitoring Div, Earth Syst Res Lab, Boulder, CO - USA
Total Affiliations: 3
Document type: Journal article
Source: JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES; v. 121, n. 1, p. 168-184, JAN 16 2016.
Web of Science Citations: 7

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 13year (2000-2013) record of regularly measured vertical CH4 mole fraction profiles above the eastern Brazilian Amazon, sensitive to fluxes from the region upwind of Santarem (SAN), between SAN and the Atlantic coast. Using a simple mass balance approach, we find substantial CH4 emissions with an annual average flux of 52.86.8mg CH4 m(-2)d(-1) over an area of approximately 1x10(6)km(2). 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 13year 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. (AU)

FAPESP's process: 08/58120-3 - Carbon tracker and water availability controls of land use and climate changes
Grantee:Humberto Ribeiro da Rocha
Support type: Research Program on Global Climate Change - Thematic Grants