Status: this preprint has been withdrawn by the authors.
δ13C values in stalagmites from tropical South America for the last two millennia
Valdir Felipe Novello,Francisco William da Cruz,Mathias Vuille,José Leandro Pereira Silveira Campos,Nicolás Misailidis Stríkis,James Apáestegui,Jean Sebastien Moquet,Vitor Azevedo,Angela Ampuero,Giselle Utida,Xianfeng Wang,Gustavo Macedo Paula-Santos,Plinio Jaqueto,Luiz Carlos Ruiz Pessenda,Daniel O. Breecker,and Ivo Karmann
Jackson School of Geosciences, University of Texas,Austin,2305,USA
Institute of Geosciences, University of São Paulo, São Paulo, 05508-080, Brazil
Abstract. Due to the many factors controlling δ13C values in stalagmites, complicating their paleoclimatic and paleoenvironmental interpretation, most studies do not present δ13C values, but instead focus mainly on δ18O values. This is also the case for most cave studies from tropical South America, where many new δ18O stalagmite records covering the last millennia were recently published. Here, we test the influence of local hydroclimate, altitude, temperature and changing vegetation types on δ13C values in stalagmites, by employing a new dataset (named δ13C_2k_SA, https://doi.pangaea.de/10.1594/PANGAEA.919050) composed of published and unpublished carbon isotope records from various sites in tropical South America. Most locations were dominated by C3 plants over the last two millennia and are characterized by speleothem δ13C values more depleted than −6 ‰. The main factors influencing δ13C values are associated with the local hydroclimate, followed by minor effects from temperature. Most of the isotopic records show a significant correlation between the δ13C and δ18O values, indicating a close relationship between local hydroclimate and atmospheric convective processes related to the South American Monsoon System.
This preprint has been withdrawn.
How to cite. Novello, V. F., da Cruz, F. W., Vuille, M., Campos, J. L. P. S., Stríkis, N. M., Apáestegui, J., Moquet, J. S., Azevedo, V., Ampuero, A., Utida, G., Wang, X., Paula-Santos, G. M., Jaqueto, P., Pessenda, L. C. R., Breecker, D. O., and Karmann, I.: δ13C values in stalagmites from tropical South America for the last two millennia, Earth Syst. Sci. Data Discuss. [preprint], https://doi.org/10.5194/essd-2020-184, 2020.
Measurements of carbon isotope (δ13C) ratios are essential for (paleo)environmental studies, such as those regarding the carbon cycle, past food consumption by pre-historic societies, paleo-vegetation reconstructions, soil dynamics and aspects regarding animal migration, etc. Here, we test the influence of local hydroclimate, altitude, temperature and changing vegetation types on δ13C values in stalagmites by employing a new dataset from South America covering the last 2 millennia.
Measurements of carbon isotope (δ13C) ratios are essential for (paleo)environmental studies,...