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末次冰消期南海南部的普林虫低值事件 被引量:13

Pulleniatina Minimum Event during the last deglaciation in the southern South China Sea
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摘要 通过对中法合作"马可·波罗"航次在南海南部陆坡采集的MD05-2894柱状样(7°2.25′N,111°33.11′E,水深1982m)进行浮游有孔虫定量分析,结果表明,末次冰消期距今16.0~14.9calkaBP之间,浮游有孔虫Pulleniatinaobliquiloculata(斜室普林虫)的丰度急剧降低至几乎为零.这次普林虫低值事件在南海南部普遍存在,发生时间介于17.0~14.8calkaBP之间,可以作为地层划分对比的良好标志.对浮游有孔虫表层种Globigerinoides和次表层种P.obliquiloculat的壳体进行Mg/Ca比值分析,再造表层和次表层海水的温度进一步揭示末次冰消期普林虫低值事件时,表层海水的温度变化不大,而次表层海水的温度明显下降~2℃,使得温跃层深度随之变浅.这次普林虫低值事件在时间上相当于H1的气候变冷事件,反映了南海南部热带海区上部水体垂向结构的巨大变化,为研究末次冰消期变暖过程中的快速气候变化提供了重要依据.
作者 安阳 翦知湣
出处 《科学通报》 EI CAS CSCD 北大核心 2009年第17期2527-2532,共6页 Chinese Science Bulletin
基金 国家重点基础研究发展计划(编号:2007CB815900) 国家自然科学基金(批准号:40621063) 大洋协会"十一五"课题(编号:DY115-01-2-3)资助项目
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