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

被引：17

作者：

梅西 ^{[1
,2
,3
]}

张训华 ^{[3
]}

郑洪波 ^{[4
]}

刘锐 ^{[3
]}

黄恩清 ^{[5
]}

机构：

[1] 中国科学院海洋研究所

[2] 中国科学院研究生院

[3] 国土资源部海洋油气资源与环境地质重点实验室

[4] 南京大学地球科学系表生地球化学研究所

[5] 同济大学海洋地质国家重点实验室

来源：

地球科学(中国地质大学学报) | 2010年 / 35卷 / 01期

关键词：

南海南部; 晚第四纪; 东亚夏季风; 轨道驱动; 有机碳; 碳酸钙; 海洋学;

D O I：

暂无

中图分类号：

P736.21 [海洋沉积];

学科分类号：

070706 [海洋地质学];

摘要：

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.

引用

页码：22 / 30

页数：9

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