越南岸外上升流区45万年来上层海水变化的颗石藻证据

苏翔; 刘传联; 李建如

越南岸外上升流区45万年来上层海水变化的颗石藻证据

同济大学海洋地质国家重点实验室, 上海 200092

基金项目:

国家自然科学基金项目(40376019,40676029,40331002,40621063)

详细信息

作者简介:
苏翔(1984-),男,硕士生,从事微体化石与古海洋学研究,E-mail:022845@smail.tongji.edu.cn

中图分类号: P736.2
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出版历程
- 收稿日期: 2006-01-31
- 修回日期: 2007-02-18

COCCOLITH EVIDENCE FOR VARIATIONS IN UPPER OCEAN WATER IN UPWELLING AREA OFF THE COAST OF VIETNAM FOR THE PAST 450 000 YEARS

State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China

摘要

摘要: 对位于南海西部越南岸外的MD05-2901柱状样45万年以来深海沉积样品进行了颗石藻分析,通过Florisphaera profunda百分含量讨论了营养跃层深度变化的趋势,并利用Beaufort等的经验公式计算了初级生产力。结果表明,45万年以来越南岸外上升流区海水营养跃层深度和初级生产力都经历了4个比较明显的变化阶段。频谱分析表明该区F.profunda百分含量和初级生产力都受到岁差和半岁差周期的控制。与南海南部ODP1143站研究资料对比表明,两地区上层海水变化趋势基本一致,都受到东亚夏季风和地球轨道岁差和半岁差周期的驱动。
- 颗石藻 /
- 上层海水 /
- 上升流 /
- 晚第四纪 /
- 南海
Abstract: Florisphaera profunda is one of the lower euphotic zone species of coccolithophores. Using its percentage we can reconstruct the variations in the upper ocean water such as the depth of nutricline and the primary productivity. Coccolith analysis has been carried out for the past 450 ka sediment from core MD05-2901 off the Vietnam coast in the western South China Sea. The results show that the depth of nutricline and primary productivity of surface water have experienced significant changes. The spectral analysis indicates that the percentage of F. profunda is influenced by low latitude process such as precession and half-precession. Comparison of F. profuuda percentage and primary productivity between the present core and ODP Site 1143 of the southern South China Sea indicates that the two sites have a similar trend in the upper ocean water change since 450 ka which are controlled by changes of Asian monsoon and orbital forcing.
- coccolithophores /
- upper ocean water /
- upwelling /
- late Quaternary /
- South China Sea

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参考文献(15)

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