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  Teleconnection between tree growth in the Amazonian floodplains and the El Niño-Southern Oscillation effect

Schöngart, J., Junk, W. J., Piedade, M. T. F., Ayres, J. M., Hüttermann, A., & Worbes, M. (2004). Teleconnection between tree growth in the Amazonian floodplains and the El Niño-Southern Oscillation effect. Global Change Biology, 10(5), 683-692. doi:10.1111/j.1529-8817.2003.00754.x.

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Schöngart, Jochen1, Autor           
Junk, Wolfgang J.1, Autor           
Piedade, Maria Teresa F.1, Autor           
Ayres, José Marcio, Autor
Hüttermann, Aloys, Autor
Worbes, Martin1, Autor           
Affiliations:
1Working Group Tropical Ecology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976549              

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Schlagwörter: Amazon; annual tree rings; dendrochronology; El Niño-Southern Oscillation; floodplain forest; paleoclimatology
 Zusammenfassung: There is a limited knowledge about the El Niño-Southern Oscillation (ENSO) effects on the Amazon basin, the world's largest tropical rain forest and a major factor in the global carbon cycle. Seasonal precipitation in the Andean watershed annually causes a several month-long inundation of the floodplains along the Amazon River that induces the formation of annual rings in trees of the flooded forests. Radial growth of trees is mainly restricted to the nonflooded period and thus the ring width corresponds to its duration. This allows the construction of a tree-ring chronology of the long-living hardwood species Piranhea trifoliata Baill. (Euphorbiaceae). El Niño causes anomalously low precipitation in the catchment that results in a significantly lower water discharge of the Amazon River and consequently in an extension of the vegetation period. In those years tree rings are significantly wider. Thus the tree-ring record can be considered as a robust indicator reflecting the mean climate conditions of the whole Western Amazon basin. We present a more than 200-year long chronology, which is the first ENSO-sensitive dendroclimatic proxy of the Amazon basin and permits the dating of preinstrumental El Niño events. Time series analyses of our data indicate that during the last two centuries the severity of El Niño increased significantly.

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Sprache(n): eng - English
 Datum: 2004-05
 Publikationsstatus: Erschienen
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 Identifikatoren: eDoc: 173927
DOI: 10.1111/j.1529-8817.2003.00754.x
Anderer: 2285/S 38160
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Titel: Global Change Biology
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 10 (5) Artikelnummer: - Start- / Endseite: 683 - 692 Identifikator: ISSN: 1354-1013