Mostrar el registro sencillo del ítem Apaéstegui Campos, James Emiliano William Cruz, Francisco Vuille, Mathias Fohlmeister, Jens Espinoza, Jhan Carlo Sifeddine, Abdelfettah Strikis, Nicolas Guyot, Jean Loup Ventura, Roberto Cheng, Hai Edwards, R. Lawrence
dc.coverage.spatial Bolivia
dc.coverage.spatial Sudamérica 2018-08-01T12:38:06Z 2018-08-01T12:38:06Z 2018-07-15
dc.identifier.citation Apaéstegui, 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. es_ES
dc.identifier.govdoc index-oti2018
dc.description.abstract Here 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.format application/pdf es_ES
dc.language.iso eng es_ES
dc.publisher Elsevier es_ES
dc.relation.ispartof urn:issn:0012-821X
dc.rights info:eu-repo/semantics/closedAccess es_ES
dc.subject Speleothems es_ES
dc.subject Stable isotopes es_ES
dc.subject MCA es_ES
dc.subject LIA es_ES
dc.subject Bolivia es_ES
dc.subject South American Monsoon es_ES
dc.title Precipitation changes over the eastern Bolivian Andes inferred from speleothem (δ¹⁸O) records for the last 1400 years es_ES
dc.type info:eu-repo/semantics/article es_ES
dc.subject.ocde es_ES
dc.subject.ocde es_ES
dc.identifier.journal Earth and Planetary Science Letters es_ES
dc.description.peer-review Por pares es_ES
dc.identifier.doi es_ES




Mostrar el registro sencillo del ítem