Ice cores are often relied on to be natural archives of past climate, capturing information that predates both our measurements and our greenhouse gas emissions. They’re a way of having records of the natural world that we don’t have a history of. However, natural archives like these can also act as records of human history, either directly (via fossils or artifacts) or indirectly. In mountainous regions, glacial ice doesn’t go as deep into the past as in Greenland or Antarctica, but it can tell stories of the recent past with excellent resolution. Airborne pollutants, for example, stand out sharply in measurements of the ice. They don’t say “pure as the driven snow” for nothing. Not much of this kind of work has been done in South America, though. Some lake sediment archives have shown the influence of local mining, but the timeline was fuzzy. In a new study, a team led by Chiara Uglietti , now at Switzerland’s Paul Scherrer Institute, has produced a detailed ice core record of air pollution from Peru’s Quelccaya Ice Cap that goes back to the year 793. Read 10 remaining paragraphs | Comments
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South American ice chemistry records rise of Incas, arrival of Spanish
