Precipitation changes over the eastern Bolivian Andes inferred from speleothem (δ¹⁸O) records for the last 1400 years

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dc.contributor.authorApaéstegui Campos, James Emiliano
dc.contributor.authorWilliam Cruz, Francisco
dc.contributor.authorVuille, Mathias
dc.contributor.authorFohlmeister, Jens
dc.contributor.authorEspinoza, Jhan Carlo
dc.contributor.authorSifeddine, Abdelfettah
dc.contributor.authorStrikis, Nicolas
dc.contributor.authorGuyot, Jean Loup
dc.contributor.authorVentura, Roberto
dc.contributor.authorCheng, Hai
dc.contributor.authorEdwards, R. Lawrence
dc.coverage.spatialBolivia
dc.coverage.spatialSudamérica
dc.date.accessioned2018-08-01T12:38:06Z
dc.date.available2018-08-01T12:38:06Z
dc.date.issued2018-07-15
dc.description.abstractHere we present high-resolution δ¹⁸ records obtained from speleothems collected in the eastern Bolivian Andes. The stable isotope records are related to the regional- to large-scale atmospheric circulation over South America and allow interpreting changes in δ¹⁸ during the last 1400 yr as a function of changes in precipitation regimes over the southern tropical Andes. Two distinct phases with more negative δ¹⁸ values, interpreted as periods of increased convective activity over the eastern Andean Cordillera in Bolivia are observed concomitantly with periods of global climate anomalies during the last millennium, such as the Medieval Climate Anomaly (MCA) and the Little Ice Age (LIA) respectively. Changes in the Bolivian δ¹⁸ record during the LIA are apparently related to a southward displacement of the Intertropical Convergence Zone (ITCZ), which acts as a main moisture driver to intensify convection over the tropical continent. During the MCA, however, the increased convective activity observed in the Bolivian record is likely the result of a different mechanism, which implies moisture sourced mainly from the southern tropical Atlantic. This interpretation is consistent with paleoclimate records further to the north in the tropical Andes that show progressively drier conditions during this time period, indicating a more northerly position of the ITCZ. The transition period between the MCA and the LIA shows a slight tendency toward increased δ¹⁸ values, indicating weakened convective activity. Our results also reveal a non-stationary anti-phased behavior between the δ¹⁸ reconstructions from Bolivia and northeastern Brazil that confirms a continental-scale east–west teleconnection across South America during the LIA.es_ES
dc.description.peer-reviewPor pareses_ES
dc.formatapplication/pdfes_ES
dc.identifier.citationApaéstegui, J., William Cruz, F., Vuille, M., Fohlmeister, J., Espinoza, J. C., Sifeddine, A., ... Edwards, R. L. (2018). Precipitation changes over the eastern Bolivian Andes inferred from speleothem (δ18O) records for the last 1400 years.==$Earth and Planetary Science Letters, 494,$==124-134. https://doi.org/10.1016/j.epsl.2018.04.048es_ES
dc.identifier.doihttps://doi.org/10.1016/j.epsl.2018.04.048es_ES
dc.identifier.govdocindex-oti2018
dc.identifier.journalEarth and Planetary Science Letterses_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12816/2162
dc.language.isoenges_ES
dc.publisherElsevieres_ES
dc.relation.ispartofurn:issn:0012-821X
dc.rightsinfo:eu-repo/semantics/closedAccesses_ES
dc.subjectSpeleothemses_ES
dc.subjectStable isotopeses_ES
dc.subjectMCAes_ES
dc.subjectLIAes_ES
dc.subjectBoliviaes_ES
dc.subjectSouth American Monsoones_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.00es_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.09es_ES
dc.titlePrecipitation changes over the eastern Bolivian Andes inferred from speleothem (δ¹⁸O) records for the last 1400 yearses_ES
dc.typeinfo:eu-repo/semantics/articlees_ES

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