南海现代砗磲壳体高分辨率元素地球化学记录及其对南海表层碳酸盐系统的指示意义

探索海洋碳酸盐系统的变化规律与大气CO2浓度之间的关系及反馈机制对于我们理解碳循环与全球气候变化之间的关系尤为重要。本研究拟以南海南沙现代活体砗磲为研究对象，成对测试其壳体的地球化学元素和同位素（δ18O、Sr/Ca、B/Ca、δ11B），尝试建立适用于重建高分辨率海水表层pH值的替代指标，探索南海南沙现代表层碳酸盐体系对持续升高的大气CO2浓度以及厄尔尼诺-南方涛动（El Niño-Southern Oscillation，ENSO）的响应；为重建地质历史时期大气CO2浓度和探索海水表层碳酸盐体系的演化提供工具。

Exploring the relationship between changes in the marine carbonate system and CO2 concentration as well as feedback mechanism are critical for understanding the relationship between carbon cycle and global climate change. In this study, we try to establish a proxy for high resolution sea surface pH construction using coupled geochemical elements and isotopes (δ18O、Sr/Ca、B/Ca、δ11B) in the living tridacna gigas shell, to probe the response of modern sea surface carbonate system in the South China Sea (Nansha Island) to the rising atmospheric CO2 concentration and the El Niño-Southern Oscillation, as well as providing a tool for reconstructing the CO2 concentration and evolution of sea surface carbonate system over geological time.