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While temperature variations, changes in tropical rainfall, and spikes in methane are known traits of climate shifts, until now, fires had not been part of the equation."The original goal was to figure out the cause of these abrupt but small increases in methane during recurring intervals of abrupt climate changes during the last glacial period."
Methane released into the atmosphere typically hangs about for around nine years before being broken down or removed. That's plenty of time to spread into all corners of the globe, where it can be trapped in small air pockets between layers of ice in places like the Riddell-Young's team saw moments in the ice core timeline where the methane's isotopic composition leapt far higher than even a geological source could achieve, implying the presence of gases from wildfires. Tellingly, these instances aligned with known moments of abrupt climate change, suggesting the fires are linked to these events.
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