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Climate of the Past An interactive open-access journal of the European Geosciences Union
Clim. Past, 10, 1967-1981, 2014
https://doi.org/10.5194/cp-10-1967-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
19 Nov 2014
Hydroclimate variability of the northwestern Amazon Basin near the Andean foothills of Peru related to the South American Monsoon System during the last 1600 years
J. Apaéstegui1,3,4, F. W. Cruz2, A. Sifeddine3,4,12, M. Vuille5, J. C. Espinoza1,6, J. L. Guyot8, M. Khodri3,7, N. Strikis2, R. V. Santos9, H. Cheng10,11, L. Edwards11, E. Carvalho9, and W. Santini8 1Instituto Geofísico del Perú, Lima, Peru
2Instituto de Geociências, Universidade de São Paulo, São Paulo, Brazil
3LMI "PALEOTRACES" (URD/UFF/Uantof-Chili), Departamento de Geoquimica-UFF, Niterói-RJ, Brazil
4Departamento de Geoquimica, Universidade Federal Fluminense, Niterói-RJ, Brazil
5University of Albany, SUNY, Albany, NY, USA
6Universidad Agraria La Molina, Lima, Peru
7UMR LOCEAN (IRD/UPMC/CNRS/MNHN), Paris-Jussieu, France
8UMR GET (IRD) Géosciences Environnement Toulouse, CNRS-IRD-UPS, OMP, Toulouse, France
9Instituto de Geociências, Universidade de Brasilia, Brasilia, DF, Brazil
10Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an, China
11Department of Geology and Geophysics, University of Minnesota, Twin Cities, Minneapolis, Minnesota, USA
12LOCEAN (CNRS, IRD, MNHN, UPMC), Bondy, France
Abstract. In this paper we explore a speleothem δ18O record from Palestina cave, northwestern Peru, at a site on the eastern side of the Andes cordillera, in the upper Amazon Basin. The δ18O record is interpreted as a proxy for South American Summer Monsoon (SASM) intensity and allows the reconstruction of its variability during the last 1600 years. Two periods of anomalous changes in the climate mean state corresponding to the Medieval Climate Anomaly (MCA) and the Little Ice Age (LIA) periods identified in the Northern Hemisphere are recognized in the record, in which decreased and increased SASM activity, respectively, have been documented. Variations in SASM activity between the MCA and the LIA seem to be larger over the northern part of the continent, suggesting a latitudinal dependence of the MCA footprint. Our results, based on time series, composite and wavelet analyses, suggest that the Atlantic Multidecadal Oscillation (AMO) plays an relevant role for SASM modulation on multidecadal scales (∼65 years), especially during dry periods such as the MCA. Composite analyses, applied to evaluate the influence of the AMO on the Palestina cave δ18O and other δ18O-derived SASM reconstructions, allow insight into the spatial footprints of the AMO over tropical South America and highlight differences between records during key studied periods. This work also reveals that replicating regional climate signals from different sites, and using different proxies is absolutely essential for a comprehensive understanding of past changes in SASM activity.

Citation: Apaéstegui, J., Cruz, F. W., Sifeddine, A., Vuille, M., Espinoza, J. C., Guyot, J. L., Khodri, M., Strikis, N., Santos, R. V., Cheng, H., Edwards, L., Carvalho, E., and Santini, W.: Hydroclimate variability of the northwestern Amazon Basin near the Andean foothills of Peru related to the South American Monsoon System during the last 1600 years, Clim. Past, 10, 1967-1981, https://doi.org/10.5194/cp-10-1967-2014, 2014.
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In this paper we explore a speleothem δ18O record from Palestina cave, northwestern Peru, on the eastern side of the Andes cordillera, in the upper Amazon Basin. The δ18O record is interpreted as a proxy for South American Summer Monsoon (SASM) intensity and allows the reconstruction of its variability during the last 1600 years. Replicating regional climate signals from different sites and using different proxies is essential for a comprehensive understanding of past changes in SASM activity.
In this paper we explore a speleothem δ18O record from Palestina cave, northwestern Peru, on...
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