Radiative forcing of methane fluxes offsets net carbon dioxide uptake for a tropical flooded forest.

Wetlands are important sources of methane (CH ) and sinks of carbon dioxide (CO ). However, little is known about CH and CO fluxes and dynamics of seasonally flooded tropical forests of South America in relation to local carbon (C) balances and atmospheric exchange. We measured net ecosystem fluxes of CH and CO in the Pantanal over 2014-2017 using tower-based eddy covariance along with C measurements in soil, biomass and water.