Cross-dating methods of coral annual bands for reconstructing oceanic climate change

重建海洋气候变化的珊瑚年带交叉年代测定方法

• 批准号: 21740362
• 负责人: MORIMOTO Maki
• 金额: $ 2.83万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21740362/
• 关键词: サンゴ骨格; 年輪; 年代決定; 酸素同位体比; 酵素同位体比; 年代測定

A cross-dating method for coral skeletons was examined by connecting plural reconstructed paleoclimate records to make their chronology longer. Holocene fossil corals were collected from Sekisei lagoon, Ryukyu, Japan, and their radiocarbon ages were determined, annual bands were counted, and oxygen isotope ratios were measured. These results indicate that more than 400-year paleoclimate record will be obtained from overlapped chronologies of some coral samples. Besides, to make oxygen isotope analysis simpler and quicker, the precision, analysis time and optimum conditions for coral samples were examined for GasBench/isotope ratio mass spectrometry.

通过连接多个重建的古气候记录，研究了珊瑚骨骼的交叉测年方法，使其年代学更长。在日本琉球关井潟湖采集了全新世珊瑚化石，测定了它们的放射性碳年龄、年带计数和氧同位素比值。这些结果表明，一些珊瑚样品的年代学重叠将获得400多年的古气候记录。此外，为了使氧同位素分析更简单、更快速，对珊瑚样品的精度、分析时间和最佳条件进行了GasBench/同位素比质谱分析。