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A 2,300-year-long annually resolved record of the South American summer monsoon from the Peruvian Andes

Open access
Bird, Broxton W., Abbott, Mark B., Vuille, Mathias, Rodbell, Donald T., Stansell, Nathan D., Rosenmeier, Michael F.·2011·Proceedings of the National Academy of Sciences

Abstract

Decadal and centennial mean state changes in South American summer monsoon (SASM) precipitation during the last 2,300 years are detailed using an annually resolved authigenic calcite record of precipitation δ 18 O from a varved lake in the Central Peruvian Andes. This unique sediment record shows that δ 18 O peaked during the Medieval Climate Anomaly (MCA) from A.D. 900 to 1100, providing evidence that the SASM weakened considerably during this period. Minimum δ 18 O values occurred during the Little Ice Age (LIA) between A.D. 1400 and 1820, reflecting a prolonged intensification of the SASM that was regionally synchronous. After the LIA, δ 18 O increased rapidly, particularly during the current warm period (CWP; A.D. 1900 to present), indicating a return to reduced SASM precipitation that was more abrupt and sustained than the onset of the MCA. Diminished SASM precipitation during the MCA and CWP tracks reconstructed Northern Hemisphere and North Atlantic warming and a northward displacement of the Intertropical Convergence Zone (ITCZ) over the Atlantic, and likely the Pacific. Intensified SASM precipitation during the LIA follows reconstructed Northern Hemisphere and North Atlantic cooling, El Niño-like warming in the Pacific, and a southward displacement of the ITCZ over both oceans. These results suggest that SASM mean state changes are sensitive to ITCZ variability as mediated by Western Hemisphere tropical sea surface temperatures, particularly in the Atlantic. Continued Northern Hemisphere and North Atlantic warming may therefore help perpetuate the recent reductions in SASM precipitation that characterize the last 100 years, which would negatively impact Andean water resources.

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Metadata

Authors
Bird, B. W., Abbott, M. B., Vuille, M., Rodbell, D. T., Stansell, N. D., & Rosenmeier, M. F.
Venue
Proceedings of the National Academy of Sciences
Published
2011-05-09
Volume
108
Issue
21
Pages
8583-8588
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2010954606
Cited by
295
References
41
FWCI
11.81
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: A 2,300-year-long annually resolved record of the South American summer monsoon from the Peruvian Andes. https://app.cochat.ai/papers/10.1073/pnas.1003719108
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Bird, B. W., Abbott, M. B., Vuille, M., Rodbell, D. T., Stansell, N. D., & Rosenmeier, M. F. (2011). A 2,300-year-long annually resolved record of the South American summer monsoon from the Peruvian Andes. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.1003719108

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