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Dust-Driven Chlorine Chemistry Shortened Methane's Lifetime During the Last Glacial Maximum
Key Takeaways
- A study in Science (Volume 393, Issue 6817) reports that atmospheric methane's lifetime was reduced during the Last Glacial Maximum.
- The paper attributes the shorter lifetime to dust-mediated chlorine chemistry, making dust an active chemical participant rather than an inert aerosol.
- Because methane's climate impact depends on how long it survives, a shorter glacial lifetime implies past methane sources were stronger than ice-core concentrations alone suggest.
- The mechanism adds a chemical feedback to glacial-interglacial transitions, as falling dust loads would have lengthened methane's lifetime.
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DT Editorial Team··via science.org