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首页> 外文期刊>Journal of Asian earth sciences >The processes and mechanisms of severe sandstorm development in the eastern Hexi Corridor China, during the Last Glacial period
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The processes and mechanisms of severe sandstorm development in the eastern Hexi Corridor China, during the Last Glacial period

机译：冰川末期河西走廊东部严重沙尘暴发展的过程和机制

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摘要

Dust transported by sandstorms has been an important feedback in climate change in the past, and its environmental effects are predicted to have a great impact on future global climatic change. Investigating the grain-size classes and the standard deviations of the modern sandstorm samples, and the samples in the Shagou section (situated in the eastern Hexi Corridor), lead us to suggest that the sand fraction within the range of 275.4-550 um in this section can be used as a sensitive indicator of severe sandstorms. We selected the size range in the L1 stratum of the Shagou loess section as indicative of temporal changes in sandstorm intensity in the eastern Hexi Corridor and found that during the Last Glacial period, severe sandstorms in the eastern Hexi Corridor occurred with high frequency during these periods: Ⅰ (70-54 ka B.P.), Ⅱ (51-48 ka B.P.), Ⅲ (45-42 ka B.P.), Ⅳ (38-33 ka B.P.), Ⅴ (31-28 ka B.P.) and Ⅵ (26-12 ka B.P.) In general, the frequency and intensity of dust storms in the early (MIS 4) and late (MIS 2) periods were both high but they were reduced in the middle period (MIS 3). The primary factors controlling severe sandstorms are hydrology and wind power, followed by the expansion of the source extent. Reduced precipitation caused the source region of sandstorms to expand; in addition, wind speeds also increased at this time. These factors may have directly contributed to the abundance of severe sandstorms. Based on the grain size from a loess section (the Shagou section) in the eastern Hexi Corridor, we propose an evolutionary sequence of the severe sandstorms during the Last Glacial period. This sequence is consistent with the dust records in the Arctic, the Antarctic and low-latitude (the central equatorial Pacific) areas. Thus globally synchronous periods of high dust activity occurred in the Last Glacial period. The strong winds proposed here provide a potential explanation for the global consistency of dust flux changes during the Last Glacial period.
机译：过去，沙尘暴运送的粉尘已成为气候变化的重要反馈，并且其环境影响预计将对未来的全球气候变化产生巨大影响。对现代沙尘暴样品以及沙沟断面（位于河西走廊以东）的样品的粒度等级和标准偏差进行调查后，我们建议在此范围内，沙粒含量在275.4-550 um范围内该区域可以用作严重沙尘暴的敏感指示。我们选择了沙沟黄土剖面L1地层的大小范围，以指示河西走廊东部沙尘暴强度的时间变化，并发现在最后一次冰期期间，河西走廊东部严重沙尘暴发生频率较高：Ⅰ（70-54 ka BP），Ⅱ（51-48 ka BP），Ⅲ（45-42 ka BP），Ⅳ（38-33 ka BP），Ⅴ（31-28 ka BP）和Ⅵ（26- 12 ka BP）通常，沙尘暴在早期（MIS 4）和后期（MIS 2）的频率和强度都很高，但在中期（MIS 3）有所减少。控制严重沙尘暴的主要因素是水文和风力，其次是震源范围的扩大。降水减少导致沙尘暴的源区扩大。另外，此时风速也有所提高。这些因素可能直接导致了严重的沙尘暴。基于河西走廊东部黄土剖面（沙沟剖面）的颗粒大小，我们提出了末次冰河时期严重沙尘暴的演变序列。该顺序与北极，南极和低纬度（赤道中部太平洋）地区的尘埃记录一致。因此，在上一个冰期发生了全球同步的高尘埃活动时期。这里提出的强风为上一次冰川期尘埃通量变化的整体一致性提供了可能的解释。

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  • 来源
    《Journal of Asian earth sciences》 |2013年第30期|769-775|共7页
  • 作者

    Qingyu Guan; Baotian Pan; Jing Yang; Lijuan Wang; Shilei Zhao; Hongjie Gui;

  • 作者单位

    Key Laboratory of Western China's Environmental Systems, Ministry of Education, College of Earth and Environmental Science, Lanzhou University, Lanzhou, Cansu 730000, PR China;

    Key Laboratory of Western China's Environmental Systems, Ministry of Education, College of Earth and Environmental Science, Lanzhou University, Lanzhou, Cansu 730000, PR China;

    Key Laboratory of Western China's Environmental Systems, Ministry of Education, College of Earth and Environmental Science, Lanzhou University, Lanzhou, Cansu 730000, PR China;

    Key Laboratory of Western China's Environmental Systems, Ministry of Education, College of Earth and Environmental Science, Lanzhou University, Lanzhou, Cansu 730000, PR China;

    Key Laboratory of Western China's Environmental Systems, Ministry of Education, College of Earth and Environmental Science, Lanzhou University, Lanzhou, Cansu 730000, PR China;

    Key Laboratory of Western China's Environmental Systems, Ministry of Education, College of Earth and Environmental Science, Lanzhou University, Lanzhou, Cansu 730000, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    last glacial period; hexi corridor; severe sandstorms; loess;

    机译：最后冰川期;河西走廊沙尘暴;黄土;

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