Tropical Lakes May Emit More Methane


Methane is not the most abundant greenhouse gas in our atmosphere, but it is among the most potent. Roughly a quarter of global methane emissions come from natural sources, and freshwater ecosystems are the largest source of atmospheric methane. Most of the data on methane dynamics in aquatic ecosystems come from boreal and temperate environments. Less is known about the fate of methane in tropical lakes.

To fill that gap, Mendoza-Pascual et al. tracked methane storage and other physiochemical properties in three volcanic crater lakes in the Philippines—Yambo, Pandin, and Calibato—where the northeast and southwest monsoons drive the regional climate. The team examined the impact of both weather…



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