南海北部沉积物中浮游有孔虫Globigerinoides ruber壳体氧同位素指示的冬季表层海水温度

发布时间：2018-04-17 12:09

本文选题：浮游有孔虫 + 氧同位素　；参考：《海洋地质与第四纪地质》2016年02期

【摘要】：有孔虫壳体的氧同位素值(δ18 O)是由其生长时海水δ18 O和温度决定的,在海水δ18 O已知的情况下,可以由壳体的δ18 O值估算海水温度。本文以南海北部沿岸地区9个站位的柱状沉积物中浮游有孔虫Globigerinoides ruber为研究对象,测试了其壳体的δ18 O值。分别以相应站点夏季与冬季表层海水的实测δ18 O值代入温度公式,估算了对应的夏季与冬季的海水温度值。然后把计算结果与World Ocean Atlas(WOA)数据库相应站点的海水温度数据作比较。结果表明,计算出的夏季海水温度与WOA的夏季温度有较大差别,而计算出的冬季海水温度则与WOA的冬季海水温度基本相当。这说明δ18 Oruber记录的是该区域冬季表层海水的温度,此区域内G.ruber这一属种的生产力和沉积通量在东亚冬季风盛行期间出现了最高值。
[Abstract]:The oxygen isotope value (未 18 O) of foraminifera shell is determined by the 未 18 O and temperature of seawater during its growth. When 未 18 O is known in seawater, the temperature of seawater can be estimated from 未 18 O of the shell.The 未 18 O values of planktonic foraminifera (Globigerinoides ruber) in the columnar sediments of 9 stations along the northern coast of the South China Sea were measured.Based on the measured 未 18 O values of surface seawater in summer and winter, the corresponding temperature values in summer and winter are estimated.Then the calculated results are compared with the seawater temperature data of the corresponding stations in the World Ocean Atlas WOAB database.The results show that the calculated sea water temperature in summer is quite different from that in WOA, while the calculated sea water temperature in winter is similar to that of WOA in winter.This indicates that 未 18 Oruber records the temperature of the surface sea water in this region in winter, and the productivity and deposition flux of the genus G.ruber in this region are the highest during the prevailing winter monsoon of East Asia.
【作者单位】：中国科学院广州地球化学研究所;广西大学海洋学院;广西大学珊瑚礁研究中心;同济大学海洋地质国家重点实验室;
【基金】：国家重点基础研究发展计划项目(2009CB421206)
【分类号】：P736.22

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