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

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Apaestegui, J. ^{[1, 2, 3]} ; Cruz, F. W. ^[4] ; Sifeddine, A. ^{[1, 3, 5]} ; Vuille, M. ^[6] ; Espinoza, J. C. ^{[2, 7]} ; Guyot, J. L. ^[8] ; Khodri, M. ^{[1, 9]} ; Strikis, N. ^[4] ; Santos, R. V. ^[10] ; Cheng, H. ^{[11, 12]} ; Edwards, L. ^[12] ; Carvalho, E. ^[10] ; Santini, W. ^[8]

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^[1] Univ Fed Fluminense, Dept Geoquim, LMI PALEOTRACES URD UFF Uantof Chili, Niteroi, RJ - Brazil

^[2] Inst Geofis Peru, Lima - Peru

^[3] Univ Fed Fluminense, Dept Geoquim, Niteroi, RJ - Brazil

^[4] Univ Sao Paulo, Inst Geociencias, BR-01498 Sao Paulo - Brazil

^[5] UPMC, MNHN, IRD, LOCEAN, CNRS, Bondy - France

^[6] SUNY Albany, Albany, NY 12222 - USA

^[7] Univ Agr La Molina, Lima - Peru

^[8] OMP, CNRS IRD UPS, UMR GET IRD Geosci Environm Toulouse, Toulouse - France

^[9] IRD UPMC CNRS MNHN, UMR LOCEAN, Paris - France

^[10] Univ Brasilia, Inst Geociencias, Brasilia, DF - Brazil

^[11] Xi An Jiao Tong Univ, Inst Global Environm Change, Xian 710049 - Peoples R China

^[12] Univ Minnesota, Dept Geol & Geophys, Minneapolis, MN - USA

• Tipo de documento: Artigo Científico
• Fonte: Climate of the Past; v. 10, n. 6, p. 1967-1981, 2014.
• Citações Web of Science: 37

Resumo

In this paper we explore a speleothem delta O-18 record from Palestina cave, northwestern Peru, at a site on the eastern side of the Andes cordillera, in the upper Amazon Basin. The delta O-18 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 (similar to 65 years), especially during dry periods such as the MCA. Composite analyses, applied to evaluate the influence of the AMO on the Palestina cave delta O-18 and other delta O-18-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. (AU)

• Processo FAPESP: 12/50260-6 - Estruturação e evolução da biota amazônica e seu ambiente: uma abordagem integrativa
• Beneficiário: Lúcia Garcez Lohmann
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Temático