摘要
黄土高原红粘土沉积与北太平洋885/886孔深海沉积记录的亚洲粉尘沉积通量对比显示,海陆风尘记录万年尺度的变化趋势一致,指示了6 5Ma以来亚洲内陆干旱化和冬季风环流变化的历史:6 5MaBP粉尘源区出现一定程度的干旱化,粉尘通量增加,为红粘土的形成提供了物质基础;5 2～3 6MaBP源区气候较为湿润,冬季风环流偏弱,导致粉尘通量大幅下降;3 6～2 6MaBP,由于青藏高原加速隆升,导致源区气候迅速干旱,冬季风环流发展,粉尘通量急剧增加。但海陆粉尘通量变化也存在差异,显示出区域及半球或全球尺度上粉尘输送方式的不同。
The comparison of dust flux recorded in the red clay sediments in the Loess Plateau with that from ODP sites 885/886 in the North Pacific exhibits the same variation trends on the tenthousandyear scale. The variations of dust flux in continental and marine aeolian sediments indicate the history of Asian inland drying evolution and East Asian winter monsoon circulation since 65 MaBP. Since 65 MaBP, Asian inland region became dry and the dust production increased. Meanwhile, the East Asian winter monsoon circulation developed and entrained vast dust materials into the Loess Plateau. The source regions turned wet and the intensity of winter monsoon circulation relatively weakened during 52～36 MaBP, which led to a large decrease of dust flux. During 36～26 MaBP, the Tibetan Plateau uplifting resulted in an increasing aridity in Asian dust source regions again and also the enhancement of winter monsoon circulation, so dust flux increased rapidly. But the variations of dust fluxes recorded in the red clay and deepsea sediments were somewhat different, implying different ways of dust transport on regional and global scales.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
2003年第3期97-101,共5页
Marine Geology & Quaternary Geology
基金
科技部重大基础研究前期研究专项"我国大陆干旱区和季风区环境科学钻探试验"(2001CCB00100)
