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Prefacing unexplored archives from Central Andean surface-to-bedrock ice cores through a multifaceted investigation of regional firn and ice core glaciochemistry

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dc.date.accessioned2024-09-08T08:07:58Z
dc.date.available2024-09-08T08:07:58Z
dc.date.issued2023-08-03
dc.description.abstractShallow firn cores, in addition to a near-basal ice core, were recovered in 2018 from the Quelccaya ice cap (5470 m a.s.l) in the Cordillera Vilcanota, Peru, and in 2017 from the Nevado Illimani glacier (6350 m a.s.l) in the Cordillera Real, Bolivia. The two sites are ~450 km apart. Despite meltwater percolation resulting from warming, particle-based trace element records (e.g. Fe, Mg, K) in the Quelccaya and Illimani shallow cores retain well-preserved signals. The firn core chronologies, established independently by annual layer counting, show a convincing overlap indicating the two records contain comparable signals and therefore capture similar regional scale climatology. Trace element records at a ~1-4 cm resolution provide past records of anthropogenic emissions, dust sources, volcanic emissions, evaporite salts and marine-sourced air masses. Using novel ultra-high-resolution (120 m) laser technology, we identify annual layer thicknesses ranging from 0.3 to 0.8 cm in a section of 2000-year-old radiocarbon-dated near-basal ice which compared to the previous annual layer estimates suggests that Quelccaya ice cores drilled to bedrock may be older than previously suggested by depth-age models. With the information collected from this study in combination with past studies, we emphasize the importance of collecting new surface-to-bedrock ice cores from at least the Quelccaya ice cap, in particular, due to its projected disappearance as soon as the 2050s.
dc.identifier.doi10.1017/jog.2022.91
dc.identifier.scopus2-s2.0-85167738618
dc.identifier.urihttps://dev.cris.inaigem.gob.pe/handle/123456789/318
dc.relation.issn00221430
dc.subjectClimate change | glaciological instruments and methods | ice chemistry | ice core | mountain glaciers
dc.titlePrefacing unexplored archives from Central Andean surface-to-bedrock ice cores through a multifaceted investigation of regional firn and ice core glaciochemistry
dc.typeJournal
dspace.entity.typePublication
oaire.citation.endPage707
oaire.citation.issue276
oaire.citation.startPage693
oaire.citation.volume69

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