南海北部珊瑚Sr/Ca和Mg/Ca温度计及高分辨率SST记录重建尝试  

CORALLINE Sr/Ca and Mg/Ca THERMOMETER FOR THE NORTHERN SOUTH CHINASEA:CALIBRATION AND PRIMARY APPLICATION ON HIGH-RESOLUTIONSST RECONSTRUCTING

作　　者：韦刚健[1] 余克服[2] 李献华[1] 赵建新[1,3] 孙亚莉[4] 孙敏[4] 聂宝符[2] 

机构地区：[1]中国科学院广州地球化学研究所,广州510640 [2]中国科学院南海海洋研究所,广州510301 [3]澳大利亚昆士兰大学,布里斯班Qld4072 [4]香港大学地球科学系,中国香港

出　　处：《第四纪研究》2004年第3期325-331,共7页Quaternary Sciences

基　　金：国家自然科学基金项目 (批准号 :4980 3 0 0 3 ;40 0 2 83 0 2和 40 2 3 10 0 9)资助

摘　　要：利用全谱直读等离子体光谱 (ICP AES)的分析方法精确分析了南海珊瑚的Sr Ca和Mg Ca比值 ,结合实测表层海水温度 (SST) ,标定了海南岛南部三亚海域和西沙海域两个滨珊瑚的Sr Ca和Mg Ca温度计。在此基础上 ,尝试对两个南海北部全新世时期的珊瑚进行SST记录重建。结果显示约 5 4 0aB .P .(小冰期 )西沙海域夏季月均SST较现代低约 1℃ ,而约 6 5 0 0aB .P .(大暖期 )海南岛三亚海域夏季月均SST则高出现代 1.0～ 1.5℃。The method for precisely and simultaneously measuring the coralline Sr/Ca and Mg/Ca ratios was established using inductively coupled plasma atomic emission spectrometry (ICP-AES). Using this method, the high-resolution Sr/Ca and Mg/Ca ratios of two Porites lutea from Sanya, South Hainan Island and Xisha Islands were measured. By comparing to the instrumentally measured sea surface temperatures in these two areas, the coralline Sr/Ca thermometer and the Mg/Ca thermometer were calibrated. These two thermometers can provide SST records with an error bar < 0.2℃, and they are suitable for high-resolution SST reconstructions in these areas. Based on these two thermometers, two short SST records were reconstructed from two Holocene Porites corals of the northern South China Sea. The results indicated that the monthly summer SSTs in Xisha Islands at about 540 years ago (the Little Ice Age) were 1℃ lower than that at present, and the monthly summer SSTs in Sanya, southern Hainan Island at 6 500 years ago (the Megathermal) were about 1℃ to 1 5℃ higher than that at present.

关 键 词：造礁珊瑚 Sr/Ca和Mg/Ca比值 SST记录 南海 

分 类 号：P736[天文地球—海洋地质]