Scientists discover hidden ocean methane source that could worsen global warming

A newly discovered microbial process in nutrient-starved ocean waters threatens to release vast quantities of methane, creating a potent climate feedback loop. | Contesto: cronaca

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• Scientists discover hidden ocean methane source that could worsen global warming

Contesto

Scientists have identified a previously unknown source of methane in the open ocean, a discovery that could significantly alter projections of future global warming. The research, published this week, reveals that specific microbes produce the potent greenhouse gas under nutrient-poor conditions, solving a decades-old mystery of why methane levels are high in vast, oxygen-rich areas of the sea. This finding directly links oceanic biology to atmospheric chemistry in a new and concerning way. For years, the presence of methane in the sunlit, oxygenated surface ocean—a phenomenon termed the "ocean methane paradox"—has puzzled researchers. Methane production was traditionally associated with oxygen-free environments, like wetlands or the guts of ruminants. The new study demonstrates that in the vast, nutrient-limited stretches of the open ocean, certain bacteria and archaea have a metabolic pathway that allows them to generate methane as a byproduct. This process occurs even in the presence of oxygen, fundamentally challenging previous assumptions about where and how this gas is formed in marine systems. The implications of this discovery are profound because of the mechanics of ocean warming. Climate change is increasing sea surface temperatures, which in turn strengthens the stratification of ocean layers. A warmer, more stratified ocean experiences less vertical mixing, preventing nutrient-rich waters from the depths from rising to feed plankton and other life in the sunlit zone. The new research suggests that this shift toward more stable, nutrient-poor conditions in the surface ocean is precisely what could allow these methane-producing microbes to flourish. This sets the stage for a dangerous climate feedback loop. As the planet warms, ocean stratification increases, creating more favorable conditions for these microbes. Their increased activity would lead to greater methane emissions from the ocean surface into the atmosphere. Since methane is over 80 times more effective at trapping heat than carbon dioxide over a 20-year period, these additional emissions would accelerate atmospheric warming, which would then further warm and stratify the oceans,...

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Categoria: cronaca