Record number :
2327582
Title of article :
Pleistocene seasonal temperature variations recorded in the δ18O of Bison priscus teeth
Author/Authors :
Bernard، نويسنده , , Aurélien and Daux، نويسنده , , Valérie and Lécuyer، نويسنده , , Christophe and Brugal، نويسنده , , Jean-Philip and Genty، نويسنده , , Dominique and Wainer، نويسنده , , Karine and Gardien، نويسنده , , Véronique and Fourel، نويسنده , , François and Jaubert، نويسنده , , Jacques، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2009
Pages :
11
From page :
133
To page :
143
Abstract :
Oxygen isotope analysis of phosphate in tooth enamel of mammals (δ18Op) constitutes a valuable method to reconstruct past air temperatures in continental environments. The method is based on interdependent relationships between the δ18O of apatite phosphate, body fluids, environmental waters and air temperatures. Continuous tooth growth and absence of enamel remodelling in bovid teeth ensures a reliable record of the intra-annual variability of air temperature through an incremental δ18O analysis from apex to cervix. This method has been applied to Bison priscus dental remains of the late Middle Pleistocene from the fossiliferous layer of a cave at Coudoulous I in South-Western France (Layer 4). The stacked oxygen isotope signal obtained by combining 9 bison teeth shows sinusoidal variations (15.0‰ to 19.1‰ V-SMOW) of seasonal origin over 2.5 yr. The corresponding computed MAT of 9 ± 3 °C is about 4 °C lower than at present. Seasons appear more contrasted in Coudoulous I during Layer 4 deposition with summers as warm as present ones (19 ± 3 °C) and significantly colder winters about 0 ± 3 °C compared to 6 ± 1 °C at present.
Keywords :
Pleistocene , steppe bison , climate , Seasonality , Oxygen isotope , apatite
Journal title :
Earth and Planetary Science Letters
Serial Year :
2009
Link To Document :
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