TROPICAL GEOGRAPHY ›› 2016, Vol. 36 ›› Issue (3): 448-456.doi: 10.13284/j.cnki.rddl.002835

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Paleoclimatic Interpretations of Speleothem δ18O Record in Monsoonal China: Controversies and Some Key Issues

ZHOU Houyun,LIU Shuhua,PENG Xiaotao,DENG Xiaomin,CHEN Qiong,MI Xiaojian   

  1. (School of Geography,South China Normal University,Guangzhou 510631,China)
  • Online:2016-05-05 Published:2016-05-05

Abstract: The paleoclimatic interpretations of speleothem δ18O in the summer monsoon (SM) area of China are widely disputed in recent years. In this paper, we first simply introduce the major viewpoints about the paleoclimatic implications of speleothem δ18O in the SM area of China. Then we raised three key questions which may be crucial to the interpretations of speleothem δ18O record in the SM area of China, such as the test of calcite precipitation under isotope equilibrium conditions, the similarity and variability of different speleothem δ18O records, and the influence of cave ventilation on speleothem δ18O record. Those questions are closely related to the connecting mechanisms between speleothem δ18O records and climate environment in the SM area of China. Answer to those questions may be helpful to settling of the disputation on paleoclimatic interpretations of speleothem δ18O record in the SM area of China. Therefore, we suggest that more attention should be paid to those questions in future.

Key words: speleothem, δ18O, summer monsoon, isotope equilibrium fractionation, cave ventilation