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dc.contributor.author Moquet, J. S.
dc.contributor.author Cruz, F. W.
dc.contributor.author Novello, V. F.
dc.contributor.author Stríkis, N. M.
dc.contributor.author Deininger, M.
dc.contributor.author Karmann, I.
dc.contributor.author Ventura Santos, R.
dc.contributor.author Millo, C.
dc.contributor.author Apaestegui, J.
dc.contributor.author Guyot, J. L.
dc.contributor.author Siffedine, A.
dc.contributor.author Vuille, M.
dc.contributor.author Cheng, H.
dc.contributor.author Edwards, R. L.
dc.contributor.author Santini, W.
dc.date.accessioned 2018-08-08T16:24:48Z
dc.date.available 2018-08-08T16:24:48Z
dc.date.issued 2016-04
dc.identifier.govdoc index-oti2018
dc.identifier.issn 09218181
dc.identifier.uri http://repositorio.igp.gob.pe/handle/IGP/2318
dc.description En: Global and Planetary Change, v. 139, (April 2016), p. 151-164.
dc.description.abstract "δ18O in speleothems is a powerful proxy for reconstruction of precipitation patterns in tropical and sub-tropical regions. The aim of this study is to calibrate the δ18O record of speleothems against historical precipitation and river discharge data in central Brazil, a region directly influenced by the Southern Atlantic Convergence Zone (SACZ), a major feature of the South American Monsoon System (SAMS). The present work is based on a sub-annual resolution speleothem record covering the last 141 years (the period between the years 1870 and 2011) from a cave in central Brazil. The comparison of this record with instrumental hydroclimate records since 1921 allows defining a strong relationship between precipitation variability and stable oxygen isotope ratios from speleothems. The results from a monitoring program of climatic parameters and isotopic composition of rainfall and cave seepage waters performed in the same cave, show that the rain δ18O variability is dominated by the amount effect in this region, while δ18O drip water remains almost constant over the monitored period (1.5 years). The δ18O of modern calcite, on the other hand, shows clear seasonal variations, with more negative values observed during the rainy season, which implies that other factors also influence the isotopic composition of carbonate. However, the relationship between δ18O of carbonate deposits and rainwater is supported by the results from the comparison between speleothem δ18O records and historical hydroclimate records. A significant correlation between speleothem δ18O and monsoon rainfall variability is observed on sub-decadal time scales, especially for the monsoon period (DJFM and NDJFM), once the rainfall record have been smoothed with a 7–9 years running mean. This study confirms that speleothem δ18O is directly associated with monsoon rainfall variability in central Brazil. The relationship between speleothem δ18O records and hydroclimatic historical records allows approximation of the absolute changes in mean annual rainfall during the last millennia in the SACZ/SAMS domain." es_ES
dc.format application/pdf es_ES
dc.language.iso en es_ES
dc.publisher Instituto Geofísico del Perú es_ES
dc.relation.uri https://www.sciencedirect.com/science/article/pii/S0921818116300376 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 Espeleotemas es_ES
dc.subject Lluvia y precipitación es_ES
dc.subject Isótopos estables en la investigación ecológica es_ES
dc.subject Hidrometeorología--Brasil es_ES
dc.subject Paleoclimatología--Brasil es_ES
dc.title Calibration of speleothem δ18O records against hydroclimate instrumental records in Central Brazil es_ES
dc.type info:eu-repo/semantics/article es_ES
dc.subject.ocde Brasil es_ES
dc.subject.ocde Precipitación es_ES
dc.subject.ocde Climatología es_ES
dc.subject.ocde Ríos es_ES
dc.subject.ocde Amazonía es_ES
dc.identifier.journal Global and Planetary Change es_ES
dc.description.peer-review Por pares es_ES
dc.identifier.doi 10.1016/j.gloplacha.2016.02.001 es_ES

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