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Preprints
https://doi.org/10.5194/essd-2020-184
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/essd-2020-184
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  30 Jul 2020

30 Jul 2020

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This preprint is currently under review for the journal ESSD.

δ13C values in stalagmites from tropical South America for the last two millennia

Valdir Felipe Novello1, Francisco William da Cruz1, Mathias Vuille2, José Leandro Pereira Silveira Campos1, Nicolás Misailidis Stríkis3, James Apáestegui4, Jean Sebastien Moquet5, Vitor Azevedo1, Angela Ampuero3, Giselle Utida1, Xianfeng Wang6, Gustavo Macedo Paula-Santos7, Plinio Jaqueto8, Luiz Carlos Ruiz Pessenda9, Daniel O. Breecker10, and Ivo Karmann1 Valdir Felipe Novello et al.
  • 1Institute of Geosciences, University of São Paulo, São Paulo, 05508-080, Brazil
  • 2Department of Atmospheric and Environmental Sciences, University at Albany, Albany, 2222, USA
  • 3Departamento de Geoquímica, Universidade Federal Fluminense, Niterói, 24020-141, Brazil
  • 4Instituto Geofísico del Perú, Lima, 15012, Peru
  • 5Institut des Sciences de la Terre d'Orléans, Orléans, 45100, France
  • 6Earth Observatory of Singapore, Nanyang Technological University, Jurong West, 639798, Singapore
  • 7Institute of geoscience Umiversity of Campinas, 13083-85
  • 8Instituto de Astronomia, Geofísica e Ciências Atmosféricas, University of São Paulo, São Paulo, 05508-090, Brazil
  • 9Center for Nuclear Energy in Agriculture (CENA), University of São Paulo, São Paulo, 13416-000, Brazil
  • 10Jackson School of Geosciences, University of Texas,Austin,2305,USA

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by employing a new dataset (named δ13C_2k_SA, https://doi.pangaea.de/10.1594/PANGAEA.919050) composed of published and unpublished carbon isotope records from various sites in tropical South America.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.

Valdir Felipe Novello et al.

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Valdir Felipe Novello et al.

Valdir Felipe Novello et al.

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Short summary
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,...
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