Methane emissions from Amazonian Rivers and their contribution to the global methane budget

Autor(es)

Sawakuchi, Henrique O. ^[1] ; Bastviken, David ^[2] ; Sawakuchi, Andre O. ^[3] ; Krusche, Alex V. ^[1] ; Ballester, Maria V. R. ^[1] ; Richey, Jeffrey E. ^[4]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Ctr Nucl Energy Agr, Environm Anal & Geoproc Lab, BR-13400970 Piracicaba, SP - Brazil

^[2] Linkoping Univ, Dept Themat Studies Water & Environm Studies, SE-58183 Linkoping - Sweden

^[3] Univ Sao Paulo, Inst Geosci, Dept Sedimentary & Environm Geol, BR-05508080 Sao Paulo - Brazil

^[4] Univ Washington, Sch Oceanog, Seattle, WA 98195 - USA

• Tipo de documento: Artigo Científico
• Fonte: GLOBAL CHANGE BIOLOGY; v. 20, n. 9, p. 2829-2840, SEP 2014.
• Citações Web of Science: 45

Resumo

Methane (CH4) fluxes from world rivers are still poorly constrained, with measurements restricted mainly to temperate climates. Additional river flux measurements, including spatio-temporal studies, are important to refine extrapolations. Here we assess the spatio-temporal variability of CH4 fluxes from the Amazon and its main tributaries, the Negro, Solimoes, Madeira, Tapajos, Xingu, and Para Rivers, based on direct measurements using floating chambers. Sixteen of 34 sites were measured during low and high water seasons. Significant differences were observed within sites in the same river and among different rivers, types of rivers, and seasons. Ebullition contributed to more than 50% of total emissions for some rivers. Considering only river channels, our data indicate that large rivers in the Amazon Basin release between 0.40 and 0.58 Tg CH4 yr(-1). Thus, our estimates of CH4 flux from all tropical rivers and rivers globally were, respectively, 19-51% to 31-84% higher than previous estimates, with large rivers of the Amazon accounting for 22-28% of global river CH4 emissions. (AU)

• Processo FAPESP: 12/17359-9 - Fluxo de metano de rios e os diferentes métodos para estimar a produção e oxidação de metano de ecossistemas aquáticos continentais
• Beneficiário: Henrique Oliveira Sawakuchi
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 11/14502-2 - Fatores reguladores da emissão de metano (CH4) em ambientes deposicionais dos Rios Negro, Tapajós, Xingu e Amazonas
• Beneficiário: Henrique Oliveira Sawakuchi
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 11/06609-1 - Proveniência, transporte e estocagem de sedimentos nos rios amazônicos
• Beneficiário: André Oliveira Sawakuchi
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 08/58089-9 - The role of rivers on the regional carbon cycle
• Beneficiário: Maria Victoria Ramos Ballester
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático