15Ma以来海陆记录的轨道-构造尺度东亚季风的演化以及西北内陆的干旱化

被引:25
作者
马小林
田军
机构
[1] 同济大学海洋地质国家重点实验室
关键词
D O I
暂无
中图分类号
P532 [古气候学];
学科分类号
摘要
通过对比分析中国内陆、南海和西北太平洋15Ma以来的构造和气候记录,本文探讨了构造和轨道尺度上东亚季风和西北内陆的干旱化历史。构造尺度上,在中中新世以来全球变冷的格局下,东亚冬季风逐步增强。而东亚夏季风表现出从10Ma开始逐渐减弱,4Ma再次增强的阶段性变化。我们推测在11.16~7.00Ma,由于青藏高原向东北方向的扩张,导致高原东北缘和西秦岭之间可能存在水汽通道,夏季风降水可以通过水汽通道到达青藏高原的东北缘。7~8Ma之后水汽通道可能全部关闭,加上全球变冷和夏季风的减弱,西北内陆全面干旱,同时高原东北缘的隆升也提供了粉尘物源,风尘开始大面积堆积。2.75Ma以来,在冰期-间冰期旋回上,夏季风变化领先冬季风约30ka,分析表明冬季风与北极冰盖的强迫联系紧密,而夏季风同时受到高纬冰盖和低纬过程的驱动。
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页码:1320 / 1330
页数:11
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