Mostrar el registro sencillo del ítem Apaéstegui Campos, James Emiliano William Cruz, Francisco Vuille, Mathias Fohlmeister, Jens Espinoza, Jhan Carlo Sifeddine, Abdselfettah Strikis, Nicolas Guyot, Jean Loup Ventura, Roberto Cheng, Hai Edwards, R. Lawrence 2018-08-01T12:38:06Z 2018-08-01T12:38:06Z 2018-07-15
dc.identifier.govdoc index-oti2018
dc.identifier.issn 0012821X
dc.description En: Earth and Planetary Science Letters, v. 494, (July 2018), p. 124-134.
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 Instituto Geofísico del Perú es_ES
dc.relation.uri es_ES
dc.rights info:eu-repo/semantics/restrictedAccess es_ES
dc.rights.uri info:eu-repo/semantics/restrictedAccess es_ES
dc.source Repositorio institucional - IGP es_ES
dc.subject Geología estratigráfica--Bolivia
dc.subject Espeleotemas es_ES
dc.subject Estalactitas y estalagmitas es_ES
dc.subject Isótopos estables en la investigación ecológica es_ES
dc.subject Monzones es_ES
dc.subject Lluvia y precipitación--Bolivia es_ES
dc.subject Circulación atmosférica es_ES
dc.subject Paleoclimatología--Bolivia--Investigación 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 Geología
dc.subject.ocde Precipitación es_ES
dc.subject.ocde Bolivia es_ES
dc.subject.ocde Región andina es_ES
dc.subject.ocde Geomorfología es_ES
dc.subject.ocde Climatología es_ES
dc.subject.ocde Petrología es_ES
dc.subject.ocde Minerología es_ES
dc.subject.ocde Ciencias de la tierra es_ES
dc.identifier.journal Earth and Planetary Science Letters es_ES
dc.description.peer-review Por pares es_ES
dc.identifier.doi 10.1016/j.epsl.2018.04.048 es_ES




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