南海最近2400年来的古海洋学变化与历史气候资料的比较  

PALEOCEANOGRAPHIC CHANGES IN THE SOUTH CHINA SEA OVER THE LAST 2400 YEARS AND THEIR COMPARISON WITH THE HISTORICAL PALEOCLIMATICAL RECORDS

作　　者：边叶萍[1] 翦知湣[1] 

机构地区：[1]同济大学海洋地质国家重点实验室,上海200092

出　　处：《海洋地质与第四纪地质》2005年第4期73-78,共6页Marine Geology & Quaternary Geology

基　　金：国家重点基础研究发展规划项目(G2000078502);国家自然科学基金项目(40125015;40321603)

摘　　要：对南海南、北陆坡两个箱式柱状样中91个沉积物样品进行了高分辨率的稳定同位素和有机碳分析,获得最近2 400年以来上部海水温度和表层古生产力的记录,发现晚全新世南海的表层海水温度和温跃层呈现阶段性变化,且有小冰期等短期气候事件.有机碳分析南海北部近900年来古生产力呈上升趋势,南部则为下降趋势.结合历史气候变化,得到东亚古气候变化的海陆记录具有很好的可比性.频谱分析显示南海晚全新世温跃层具有～175、～210和～360 a等百年尺度的周期,与太阳活动周期一致,说明百年尺度的短期气候变化可能与太阳活动有关.Based on the high-resolution analysis of planktonic foraminiferal isotope and organic carbon of 91 sediment samples from two box cores located respectively in the southern and northern slopes of the South China Sea （SCS）, the changes of sea surface temperature and paleoproductiviy of the past 2 400 years were reconstructed. The sea surface temperature and the depth of thermocline varied in different stages during the late Holocene, with some short-term climate events such as the Little Ice Age. The organic carbon accumulation rates indicate that the paleoproductivity increased in the northern SCS and decreased in the southern SCS during the past 900 years. Comparison with the historical climate changes shows a good correlation between the marine and continental records of the East Asian paleoclimate changes. The spectral analysis shows that the thermocline depth oscillated in the centennial-scale cycles of -175 a, -210 a and -360 a during the late Holocene, probably indicating the association between the centennial scale climate changes and the solar activities.

关 键 词：温跃层 短期气候事件 历史资料 晚全新世 南海 

分 类 号：P532[天文地球—古生物学与地层学]