Changes in Late Pleistocene Dust Activity in the Southern Tibetan Plateau in Response to Orbital Precession and Mountain Glaciers

IF 3.5 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Journal of Geophysical Research: Earth Surface Pub Date : 2024-06-01 DOI:10.1029/2023JF007615
Liangqing Cheng, Hao Long, Zhi Zhang, Jingran Zhang, Zhong Chen, Yougui Song, Yubin Wu, Pingcuo Luobu, Linhai Yang, Zhibao Dong
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Abstract

The Tibetan Plateau (TP) serves not only as the “water tower” of Asia but also as an important source in the global atmospheric dust cycle. While our knowledge of modern dust activity and its impacts and interactions with climate change in the TP has greatly advanced in the past decades, the emission, transport, and deposition of dust on the geological time scale remains unclear. This study analyzed a 7.6-m thick sedimentary sequence consisting of loess and sand from the Yarlung Tsangpo River (YTR) valley in the southern TP. The sequence chronology was established using nineteen K-feldspar post-infrared infrared stimulated luminescence (pIRIR) ages, which ranged from 47.11 ± 1.95 to 116.65 ± 5.55 ka in a general stratigraphical order. The dust sedimentation rate and sorting coefficient of grain size were used to reflect dust activity and near-surface wind, respectively. The results indicated that dust activity in the southern TP is mainly regulated by the near-surface wind intensity and follows the variation pattern of precession, although the waxing and waning of mountain glaciers also affect the amplitude of dust activity. This pattern is not consistent with the Greenland dust record, which follows the variation pattern of obliquity. Therefore, dust accumulation in the southern TP is concluded to be primarily controlled by the South Asian winter monsoon (SAWM) forced by precession, whereas dust accumulation in Greenland is closely related to the intensity of the high-level westerlies forced by obliquity.

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青藏高原晚更新世尘埃活动的变化与轨道前移和高山冰川的关系
青藏高原不仅是亚洲的 "水塔",也是全球大气尘埃循环的重要来源。在过去的几十年中,我们对青藏高原现代尘埃活动及其与气候变化的影响和相互作用的认识有了很大的进步,但尘埃在地质时间尺度上的排放、迁移和沉积情况仍不清楚。本研究分析了大洋洲南部雅鲁藏布江(YTR)河谷的一个 7.6 米厚的沉积序列,该序列由黄土和砂土组成。利用 19 个 K 长石红外后激发发光(pIR)年龄建立了序列年代学,这些年龄按一般地层顺序介于 47.11 ± 1.95 ka 至 116.65 ± 5.55 ka 之间。尘埃沉积速率和粒度分选系数分别用来反映尘埃活动和近地表风。结果表明,南部TP地区的沙尘活动主要受近地面风力强弱的调节,并遵循前震变化规律,但山地冰川的消长也会影响沙尘活动的幅度。这一模式与格陵兰岛的尘埃记录不一致,后者遵循的是斜度变化规律。因此,可以得出结论,南部大洋洲的沙尘累积主要受南亚冬季季风的控制,而格陵兰岛的沙尘累积则与高纬度西风的强度密切相关。
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来源期刊
Journal of Geophysical Research: Earth Surface
Journal of Geophysical Research: Earth Surface Earth and Planetary Sciences-Earth-Surface Processes
CiteScore
6.30
自引率
10.30%
发文量
162
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