VARIATIONS OF DUST FLUX IN THE LOESS PLATEAU DURING 6.5～2.2 MaBP:IMPLICATIONS FOR EAST ASIAN WINTER MONSOON EVOLUTION AND ASIAN ARIDITY
VARIATIONS OF DUST FLUX IN THE LOESS PLATEAU DURING 6.5～2.2 MaBP:IMPLICATIONS FOR EAST ASIAN WINTER MONSOON EVOLUTION AND ASIAN ARIDITY
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发表时间：
2003
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通讯作者：
C. Jun
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作者：
C. Jun
黄土高原红粘土沉积物中的沙尘通量与北太平洋ODP 885/886站的沙尘通量在万年尺度上的变化趋势一致。大陆和海洋风成沉积物中粉尘通量的变化反映了6 ~ 15 MaBP以来亚洲内陆干旱化和东亚冬季风环流的历史。6 ~ 15 MaBP以来，亚洲内陆地区变干，沙尘产生量增加。与此同时，东亚冬季风环流发展，携带大量沙尘物质进入黄土高原。5 ~3年6 MaBP，源区变湿，冬季风环流强度相对减弱，沙尘通量大幅减少。在3 ~ 206 MaBP期间，青藏高原隆升导致亚洲沙尘源区再次干旱化，冬季风环流增强，沙尘通量迅速增加。但在红粘土和深海沉积物中记录的沙尘通量的变化有所不同，这意味着沙尘在区域和全球尺度上的传输方式不同。
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.