700,000 years of tropical Andean glaciation

D. T. Rodbell, R. G. Hatfield, M. B. Abbott, C. Y. Chen, A. Woods, J. S. Stoner, D. McGee, P. M. Tapia, M. Bush, B. L. Valero-Garcés, S. B. Lehmann, S. Z. Mark, N. C. Weidhaas, A. L. Hillman, D. J. Larsen, G. Delgado, S. A. Katz, K. E. Solada, A. E. Morey, M. FinkenbinderB. Valencia, A. Rozas-Davila, N. Wattrus, S. M. Colman, M. G. Bustamante, J. Kück, S. Pierdominici

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Our understanding of the climatic teleconnections that drove ice-age cycles has been limited by a paucity of well-dated tropical records of glaciation that span several glacial–interglacial intervals. Glacial deposits offer discrete snapshots of glacier extent but cannot provide the continuous records required for detailed interhemispheric comparisons. By contrast, lakes located within glaciated catchments can provide continuous archives of upstream glacial activity, but few such records extend beyond the last glacial cycle. Here a piston core from Lake Junín in the uppermost Amazon basin provides the first, to our knowledge, continuous, independently dated archive of tropical glaciation spanning 700,000 years. We find that tropical glaciers tracked changes in global ice volume and followed a clear approximately 100,000-year periodicity. An enhancement in the extent of tropical Andean glaciers relative to global ice volume occurred between 200,000 and 400,000 years ago, during sustained intervals of regionally elevated hydrologic balance that modified the regular approximately 23,000-year pacing of monsoon-driven precipitation. Millennial-scale variations in the extent of tropical Andean glaciers during the last glacial cycle were driven by variations in regional monsoon strength that were linked to temperature perturbations in Greenland ice cores1; these interhemispheric connections may have existed during previous glacial cycles.

Original languageEnglish (US)
Pages (from-to)301-306
Number of pages6
JournalNature
Volume607
Issue number7918
DOIs
StatePublished - Jul 14 2022

Bibliographical note

Funding Information:
We recognize the late G. O. Seltzer for his foundational work on the Lake Junín Drilling Project. We are grateful to Project members for their contributions to fieldwork and data collection, the International Continental Scientific Drilling Program (ICDP) for logistical support, the authorities of the Reserva Nacional de Junín for their assistance, and DOSECC Exploration Services (USA) and Geotec (Perú) for drilling expertise. We thank LacCore for access to facilities, core curation, multisensor core logging and XRF data, and data management. We thank D. Schnurrenberger, A. Myrbo, S. Loeffler, M. Shapley, J. Bartle, C. Oballe and C. Casey for their assistance during drilling; K. Brady and A. Noren for their work managing and coordinating fieldwork and LacCore-based analyses. This research was supported by grants from the ICDP (02-2012) and from the US National Science Foundation (D.T.R., EAR-1402076; M.B.A., EAR-1404113; J.S.S., EAR-1400903; D.M., EAR-1404414; M.B., EAR-1402054).

Funding Information:
We recognize the late G. O. Seltzer for his foundational work on the Lake Junín Drilling Project. We are grateful to Project members for their contributions to fieldwork and data collection, the International Continental Scientific Drilling Program (ICDP) for logistical support, the authorities of the Reserva Nacional de Junín for their assistance, and DOSECC Exploration Services (USA) and Geotec (Perú) for drilling expertise. We thank LacCore for access to facilities, core curation, multisensor core logging and XRF data, and data management. We thank D. Schnurrenberger, A. Myrbo, S. Loeffler, M. Shapley, J. Bartle, C. Oballe and C. Casey for their assistance during drilling; K. Brady and A. Noren for their work managing and coordinating fieldwork and LacCore-based analyses. This research was supported by grants from the ICDP (02-2012) and from the US National Science Foundation (D.T.R., EAR-1402076; M.B.A., EAR-1404113; J.S.S., EAR-1400903; D.M., EAR-1404414; M.B., EAR-1402054).

Publisher Copyright:
© 2022, The Author(s).

PubMed: MeSH publication types

  • Journal Article
  • Research Support, U.S. Gov't, Non-P.H.S.
  • Research Support, Non-U.S. Gov't

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