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南海西沙大砗磲高分辨率Sr/Ca温度计及其意义
  • 期刊名称：地球环境学报
  • 时间：0
  • 页码：381-386
  • 语言：中文
  • 分类：P532[天文地球—古生物学与地层学;天文地球—地质学]
  • 作者机构：[1]中国科学技术大学地球和空间科学学院极地环境研究室,合肥230026
  • 相关基金：国家自然科学基金重点项目（40730107）;国家重点基础研究发展计划（2010CB428902）
  • 相关项目：全新世南极南海典型岛屿对全球变化的生态响应与对比
作者： 孙立广|
关键词： 砗磲, 南海, Sr/Ca, SST, 古气候, Tridacna , South China Sea , Sr/Ca , SST , paleoclimate
中文摘要：

本文对采自南海西沙的现代大砗磲（AD1994--2005）进行高分辨率Sr／Ca比值分析。结果表明．与其他海洋双壳类Sr／Ca的不规律变化特征不同，南海砗磲St／Ca比值呈现出很好的年周期变化，且与实测SST形成很好的对应。通过全年对应和极端对应两种方法，建立了月分辨率砗磲Sr／Ca与SST的相关方程，分别为：Sr／Ca（mmol·mol-1）=3．595—0．0487×SST（℃）和Sr／Ca（mmol·mol-1）=3．842—0．0578×SST（℃）。后报结果对比分析显示两个方程在后报年平均温度上没有明显的差异，都较为准确。但是在后报极端月份温度上，极端对应方法更为准确。本研究为应用大砗磲探讨全新世SST的变化提供了新的依据。

英文摘要：

In this study, we collected a modern Tridacna gigas specimen from Xisha Islands of South China Sea, analyzed the high resolution Sr/Ca ratios of its inner shell. It was found, for the first time, that the Sr/Ca of Tridacna gigas displays regular seasonal variations and is well correlated with the SST. Different calculations are discussed for calibrating Sr/Ca with sea surface temperature （SST）. Calibrations Sr/Ca against instrumental SST yield the following equations： Sr/Ca （mmol mol-1） = 3. 595 - 0. 0487 ×SST （ ℃ ） （ using monthly data） and Sr/Ca （ mmol mol -1） = 3. 842 - 0. 0578×SST （℃） （using only extremes）. We show that the method using only extremes is slightly more accurate and is also more reliable.

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全新世南极南海典型岛屿对全球变化的生态响应与对比
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