Methane dynamics in large Amazonian Rivers - Sawakuchi, Henrique Oliveira; Bastviken, David; Sawakuchi, André Oliveira; Borges, C. D.; Tsai, Siu Mui; Ward, Nicholas D.; Richey, Jeffrey Edward; Ballester, Maria Victoria Ramos; Krusche, Alex Vladimir (AGU Fall Meeting 2014, 2014)