造礁珊瑚δ^(18)O记录的过去气候研究进展

Developments in the Study of Reef Coral δ^(18)O Recorded Past-Climate

造礁珊瑚是研究热带海洋环境变化的极好材料,珊瑚骨骼δ^(18)O分析是提示其所记录的环境信息的重要手段。近年来该领域发展很快,主要表现在:(1)δ^(18)O分析的分辨率和分析精度都大大提高,时间分辨率一般可达李,高者已达到月和周,δ^(18)O的分析精确度一般在0.008％以下.(2)认识到影响骨骼δ^(18)O的因素主要为海水表层温度(SST)、海水δ^(18)O组分、珊瑚生长率和取样技术等,不同生长区域,影响珊瑚骨骼δ^(18)O的主要因素和影响程度不一致。(3)通过对珊瑚δ^(18)O的分析,揭示和重建SST、降雨、El Nino等多种环境信息。关于南海造礁珊瑚δ^(18)O的研究工作正在进行之中。

Reef coral has proved to be an excellent material with which to research into the tropical ocean environment, and its skeletonδ18O is an important tracer for analyzing the recorded environmental information. The recent developments in this field are significant, and they are summarized in this paper as:a) Improvement in coral sampling resolution and measuring precisionThe present resolution in coral δ18O analysis is seasonal, monthly or weekly, the precision is better than 0.008%.b) Full understanding of the factors influencing coralδ18OThe factors influencing coral δ18O are sea surface temperature (SST), seawater δ18O , coral growth rate, sampling and measuring techniques et al. The dominated factor and the degree of influencing coralδ18O vary with coral reef areas.c) Environmental information revealed and reconstructed by coral δ18O Based on the coral δ18O data, much information, such as SST, rainfall, El Nino Southern Oscillation (ENSO) can be and have been reconstructed.Our research work the reef corals of the South China Sea is in progress.