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Related Experiment Videos

A stable isotope aridity index for terrestrial environments.

Naomi E Levin1, Thure E Cerling, Benjamin H Passey

  • 1Department of Geology and Geophysics, University of Utah, 135 South 1460 East, Salt Lake City, UT 84112, USA.

Proceedings of the National Academy of Sciences of the United States of America
|July 15, 2006
PubMed
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Researchers developed a new method to measure aridity using oxygen isotopes in mammal teeth. This approach distinguishes between evaporation-sensitive and evaporation-insensitive species to reconstruct past environmental conditions.

Area of Science:

  • Paleoclimatology
  • Isotope Geochemistry
  • Paleontology

Background:

  • Oxygen isotopes in bioapatite are sensitive to water sources and evaporation.
  • Understanding environmental aridity is crucial for reconstructing past climates and ecosystems.
  • Mammalian tooth enamel records environmental information through oxygen isotopes.

Purpose of the Study:

  • To develop a proxy for terrestrial aridity using oxygen isotopic composition of mammalian tooth enamel.
  • To classify mammalian species based on their sensitivity to environmental aridity.
  • To establish a method for reconstructing past aridity in Eastern Africa.

Main Methods:

  • Analysis of oxygen isotopic composition (delta(18)O) in tooth enamel from 14 mammalian species across 18 locations in Eastern Africa.

Related Experiment Videos

  • Classification of species into evaporation-sensitive (ES) and evaporation-insensitive (EI) groups based on their isotopic responses to aridity.
  • Quantification of aridity by measuring the oxygen isotope enrichment between ES and EI animals.

    • Main Results:

    • Tooth enamel delta(18)O values of ES animals correlate positively with environmental aridity.
    • Tooth enamel delta(18)O values of EI animals reflect local meteoric water delta(18)O.
    • The difference in delta(18)O values between ES and EI animals serves as a direct indicator of aridity.

    Conclusions:

    • The distinction between evaporation-sensitive and evaporation-insensitive species allows for a robust proxy for terrestrial aridity.
    • Oxygen isotope composition of bioapatite can be used as an index of past environmental aridity.
    • This method provides a novel tool for paleoclimate reconstructions in regions with limited instrumental data.