Title
Prefacing unexplored archives from Central Andean surface-to-bedrock ice cores through a multifaceted investigation of regional firn and ice core glaciochemistry
Date Issued
03 August 2023
Access level
open access
Resource Type
journal article
Author(s)
Clifford H.M.
Potocki M.
Rodda C.
Dixon D.
Birkel S.
Handley M.
Korotkikh E.
Introne D.
Schwanck F.
Tavares F.A.
Bernardo R.T.
Lindau F.G.L.
Gomez O.V.
Jara-Infantes H.
Perry L.B.
Maurer J.
Seimon A.
Schwikowski M.
Casassa G.
Hou S.
Kurbatov A.V.
Miner K.R.
Simões J.C.
Mayewski P.A.
Publisher(s)
Cambridge University Press
Abstract
Shallow 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.
Start page
693
End page
707
Volume
69
Issue
276
Language
English
OCDE Knowledge area
Meteorología y ciencias atmosféricas Investigación climática Geografía física
Scopus EID
2-s2.0-85167738618
Source
Journal of Glaciology
ISSN of the container
00221430
Sponsor(s)
This research is part of the Joint Brazil, Peru, US project with permission granted by Peru funded by NSF P2C2 AGS-1600018 (Mayewski and Birkel), and the Brazilian grants - CNPq 404002/2013-7 and 465680/2014-13; FAPERGS 17/2551-0000518-0 (Simes). All ice core analyses presented in this paper were conducted in the Climate Change Institute's W. M. Keck Laser Ice Facility and their ICP-MS laboratory at the University of Maine. We gratefully acknowledge support for this facility from the W. M. Keck Foundation and the National Science Foundation (PLR-1042883, PLR-1203640 and PLR-1417476). The Quelccaya (QU-18 and QNB-18) ice cores were collected by a joint team effort of Climate Change Institute at the University of Maine, Centro Polar e Climatico, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil, Unidad de Glaciología y Recursos Hídricos, Universidad Nacional de San Antonio de Abad del Cusco (UNSAAC), Autoridad Nacional de Agua and National Research Institute for Glaciers and Mountains Ecosystems (INAIGEM). Illimani ice core (IL-17) was recovered by the team of the Ice Memory project (drill manager P. Ginot), and supported by IRD, CNRS, UGA Foundation and local Bolivian institutions (Universidad Mayor San Andrés - La Paz). We thank Adrian Ccahuana Condori and his team for field support as well as Nilton Montoya and Maxwell Rado for their assistance in the export of the ice. We thank the driller Mike Waszkiewicz and Dan Dixon for their efforts during the drilling campaign. Additional support in ice core processing and analysis was provided by Ling Fang (Paul Scherrer Institute) and the Alfred-Wegener-Institut (Bremerhaven, Germany) and the Climate and Environmental Physics Institute, University of Bern. We gratefully acknowledge their support.
Sources of information: Directorio de Producción Científica Instituto Nacional de Investigación en Glaciares y Ecosistemas de Montaña Instituto Nacional de Investigación en Glaciares y Ecosistemas de Montaña