中国季风区石笋氧同位素气候指示意义:主要争议与几个重要问题

Paleoclimatic Interpretations of Speleothem δ^(18)O Record in Monsoonal China: Controversies and Some Key Issues

对近些年来国内外广泛争议的话题——中国季风区岩溶洞穴沉积氧同位素组成(δ^(18)O)的气候指示意义进行了梳理,简要介绍了有关争议各方的主要观点。同时针对中国季风区洞穴沉积δ^(18)O的研究提出了几个重要问题:同位素平衡分馏的检验问题、洞穴沉积δ^(18)O记录的相似性(重复性)与差异性,以及洞穴通风可能对洞穴沉积δ^(18)O记录的影响等。这些问题涉及到洞穴沉积δ^(18)O记录与气候指标之间的联系机制,对其探讨可能有助于解决有关争议。因此,建议在今后的研究中应该重点关注这些问题,因为洞穴沉积δ^(18)O与气候环境指标之间的联系机制是中国季风区内应用洞穴沉积δ^(18)O进行古气候古环境研究的基础。

The paleoclimatic interpretations of speleothem δ（18）O 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 δ（18）O in the SM area of China. Then we raised three key questions which may be crucial to the interpretations of speleothem δ（18）O 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 δ（18）O records, and the influence of cave ventilation on speleothem δ（18）O record. Those questions are closely related to the connecting mechanisms between speleothem δ（18）O 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 δ（18）O record in the SM area of China. Therefore, we suggest that more attention should be paid to those questions in future.