Methane emissions reduce the radiative cooling effect of a subtropical estuarine mangrove wetland by half.

The role of coastal mangrove wetlands in sequestering atmospheric carbon dioxide (CO ) and mitigating climate change has received increasing attention in recent years. While recent studies have shown that methane (CH ) emissions can potentially offset the carbon burial rates in low-salinity coastal wetlands, there is hitherto a paucity of direct and year-round measurements of ecosystem-scale CH flux (F ) from mangrove ecosystems. In this study, we examined the temporal variations and biophysical drivers of ecosystem-scale F in a subtropical estuarine mangrove wetland based on 3 years of eddy covariance measurements.