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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Rock magnetic and grain size evidence for intensified Asian atmospheric circulation since 800,000 years B.P. related to Tibetan uplift
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Rock magnetic and grain size evidence for intensified Asian atmospheric circulation since 800,000 years B.P. related to Tibetan uplift

机译：自公元前800,000年以来，岩石磁性和晶粒度证据表明亚洲大气环流加剧。与藏族隆起有关

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摘要

Paleomagnetic, rock magnetic, and grain size studies of a thick loess sequence in the West Qin Ling (mountain range) show that loess deposition there began about 800 ka. The data reveal a progressively increasing coarse grain size fraction upwards into the Holocene. The averages of these coarse size fractions are higher than in the central Loess Plateau, which was apparently farther from the source area, and slightly lower than those of the western Loess Plateau and the eastern Tibetan Plateau, which were therefore closer to the source area. The coarsening and source area location suggest (1) that Asian air circulation may have changed and intensified at about 800 ka resulting in dust deposition in West Qin Ling; (2) that dust-carrying winds were driven not only by the Asian winter monsoon, but included also the westerlies and a winter monsoon caused by the Tibetan Plateau High, and (3) that intensification of all these air circulation systems continues to the present. Increased elevation of the Tibetan Plateau so that it reached into the cryosphere by about 800 ka and a subsequent persistent uplift of the plateau may have been the mechanisms to trigger a change and intensify the air circulation system. Moreover, this circulation shift and intensification, simultaneous with a shift in Milankovitch periodicity, may have contributed to global climate changes such as the 15% increase in global ice volume at ca. 800 ka.
机译：对西秦岭（山脉范围）厚黄土序列的古磁性，岩石磁性和粒度研究表明，那里的黄土沉积开始于大约800 ka。数据表明，向上进入全新世的粗晶粒度分数逐渐增加。这些粗粒级分的平均值高于中部黄土高原，显然距源区较远，但略低于西部黄土高原和青藏高原的东部，因此较接近源区。粗化和源区的位置表明：（1）亚洲空气环流可能在800 ka左右发生变化并加剧，导致西秦岭的尘埃沉积; （2）扬尘风不仅是由亚洲冬季风驱动的，而且还包括由青藏高原引起的西风和冬季风，以及（3）所有这些空气循环系统的强化作用一直持续到现在。 。青藏高原的海拔升高，使其到达冰冻圈约800 ka，随后高原的持续隆升可能是引发变化和加强空气循环系统的机制。此外，这种循环的变化和加剧，以及米兰科维奇周期的变化，可能导致了全球气候变化，例如全球冰量增加了15％。 800 ka。

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