Mostrar el registro sencillo del ítem Moquet, Jean Sébastien Cruz, F. W. Novello, V. F. Stríkis, N. M. Deininger, M. Karmann, I. Ventura Santos, R. Millo, C. Apaéstegui Campos, James Emiliano Guyot, J. L. Siffedine, A. Vuille, M. Cheng, H. Edwards, R. L. Santini, W.
dc.coverage.spatial Brasil 2018-08-08T16:24:48Z 2018-08-08T16:24:48Z 2016-04
dc.identifier.citation Moquet, J. S., Cruz, F. W., Novello, V. F., Stríkis, N. M., Deininger, M., Karmann, I., ... Santini, W. (2016). Calibration of speleothem δ18O records against hydroclimate instrumental records in Central Brazil.==$Global and Planetary Change, 139,$==151-164. es_ES
dc.identifier.govdoc index-oti2018
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 eng es_ES
dc.publisher Elsevier es_ES
dc.relation.ispartof urn:issn:0921-8181
dc.rights info:eu-repo/semantics/restrictedAccess es_ES
dc.subject Speleothem es_ES
dc.subject Climate calibration es_ES
dc.subject Stable isotopes es_ES
dc.subject SAMS–SACZ es_ES
dc.subject Central Brazil 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 es_ES
dc.subject.ocde es_ES
dc.identifier.journal Global and Planetary Change es_ES
dc.description.peer-review Por pares es_ES
dc.identifier.doi es_ES




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