南海南部50万年以来碳酸钙和有机碳记录及其揭示的东亚夏季风演化

为了解南海南部第四纪冰期旋回中表层生产力的变化与东亚夏季风的演化关系，通过对南海南部MD05-2897孔晚第四纪500ka以来碳酸钙和有机碳含量及堆积速率高分辨率的研究发现，碳酸钙含量及堆积速率表现出明显的冰期-间冰期旋回变化，而有机碳的含量及堆积速率则主要呈现频率更高的周期性变化.碳酸钙和有机碳含量及堆积速率都在间冰期时增加，冰期时降低，反映了间冰期时夏季风的增强导致上升流的加强和营养物质的增加，促使表层生产力提高.碳酸钙和有机碳含量及堆积速率具有100ka偏心率周期、40ka斜率周期、20ka岁差和10ka半岁差周期等最为丰富的频谱，显示出低纬海区对轨道周期响应的特色.碳酸钙和有机碳的堆积速率与北半球低纬夏季日射量吻合较好，说明岁差相关的北半球低纬夏季太阳辐射量的变化可能是东亚夏季风强度变化的主要控制因素，而与全球冰量相关的气候变化可能是次要因素. 

500000-Year Records of Carbonate and Organic Carbon from the Southern South China Sea and Implication for East Asian Summer Monsoon Evolution

In order to understand the relation between surface productivity changes and the evolution of the East Asian summer monsoon during the Quaternary glacial cycles in southern South China Sea, high-resolution study on content and accumulation rate of calcium carbonate and organic carbon of Core MD05-2897 were done to draw the conclusions as follows: the content and accumulation rate of calcium carbonate showed significant glacial-interglacial cycle change while organic carbon mainly showed a higher frequency o...