The significant eruption of the Hunga Tonga-Hunga Ha’apai submarine volcano in January 2022, situated in the Tongan archipelago of the southern Pacific Ocean, may have uncovered an unforeseen method for addressing methane emissions, one of the most potent greenhouse gases. This insight comes from a recent study published in Nature Communications, as reported by CNN.
This eruption is recognized as one of the most powerful in contemporary history, sending gas nearly 40 miles into the atmosphere. The explosion was estimated to be hundreds of times more forceful than the atomic bomb dropped on Hiroshima. It generated a tsunami and produced a sonic boom that reverberated around the globe twice. Surprisingly, researchers have indicated that the eruption may have inadvertently mitigated some of its own environmental impact.
The finding was derived from satellite data monitoring the eruption plume. Scientists identified an unexpectedly large concentration of formaldehyde, a substance typically produced when methane decomposes in the atmosphere.
“We detected a vast cloud of formaldehyde that shouldn’t ordinarily be present,” stated Maarten van Herpen, a physicist and executive director at Acacia Impact Innovation, a Dutch consulting firm and one of the study’s authors.
The research team posits that they witnessed a chemical reaction previously noted over the Atlantic Ocean. Earlier investigations indicated that Saharan dust carried over the Atlantic interacts with sea salt spray, leading to the formation of minute iron-based particles. When these particles are illuminated by sunlight, they produce chlorine atoms that react with and assist in degrading atmospheric methane.
The recent study suggests that a comparable reaction transpired after the Tonga eruption. The volcano released substantial quantities of salty water vapor into the stratosphere—equivalent to the volume of approximately 58,000 Olympic-sized swimming pools—alongside volcanic ash. Researchers hypothesize that sunlight interacting with this combination generated chlorine, which then contributed to the breakdown of methane that was emitted during the eruption.
Over a span of 10 days, scientists monitored the formaldehyde cloud. Given that formaldehyde typically lasts only a few hours in the atmosphere, its prolonged presence indicated ongoing methane degradation for more than a week.
The research team estimates that the eruption discharged around 330,000 tonnes of methane, with approximately 900 tonnes being decomposed daily.
Matthew Johnson, a chemistry professor at the University of Copenhagen and a co-author of the study, described the results as “new and entirely unexpected.”
This discovery holds considerable importance since methane is about 80 times more effective than carbon dioxide at trapping heat over a 20-year timeframe. It is accountable for around one-third of the current global warming, and atmospheric methane levels have doubled in the last two centuries.
While it remains crucial to reduce carbon dioxide emissions, which can linger in the atmosphere for centuries, minimizing methane is often regarded as a more immediate way to curb short-term warming due to its significantly shorter atmospheric lifespan.
The researchers propose that their findings may eventually lead to the development of innovative strategies for reducing methane emissions at their sources. They also suggest that this process could inform future geo-engineering initiatives aimed at cooling global temperatures.
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