Ice core analysis reveals greater historical equatorial contributions to global methane levels, indicating a stronger role for tropical regions in atmospheric models.
The first record of global methane in the tropics, collected from the summit of the mountain Nevado Huascarán in Peru, fills a crucial gap in historical methane data sets. It improves our understanding of the contribution of tropical sources to the past and current global methane distribution. An ice core from a tropical mountain shows that the equatorial input to methane levels was greater than previously thought.
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