Methane Hydrates and Related Phenomena

Methane hydrates are ice-like solids that lock vast quantities of methane within seafloor sediments under high pressure and low temperature, and understanding what happens to that methane—before and after it escapes—sits at the intersection of microbiology, chemistry, and climate science. Much of the methane released from these deposits is consumed by microbial communities before it ever reaches the water column, through a process called anaerobic oxidation of methane, in which archaea and their bacterial partners break down methane without oxygen, often coupling that reaction to sulfate reduction, denitrification, or nitrite-dependent pathways. Researchers are working to quantify how much methane these communities actually intercept, how destabilization of hydrate reservoirs under a warming ocean might outpace microbial consumption, and how novel metabolic pathways—such as nitrite-driven methane oxidation—reshape our understanding of carbon and nitrogen cycling in subseafloor environments. The stakes are high: methane hydrates represent one of the largest organic carbon reservoirs on Earth, and the microorganisms living within them may be a critical, and still poorly constrained, brake on greenhouse gas emissions from the deep sea.

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Keywords

Methane OxidationAnaerobicGas HydratesMicrobial CommunitiesSubseafloor SedimentsBiogeochemistry