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首页> 外文期刊>Theoretical and applied climatology >Observed particle sizes and fluxes of Aeolian sediment in the near surface layer during sand-dust storms in the Taklamakan Desert
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Observed particle sizes and fluxes of Aeolian sediment in the near surface layer during sand-dust storms in the Taklamakan Desert

机译：塔克拉玛干沙漠沙尘暴过程中近地表风沙沉积物的粒径和通量

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摘要

Monitoring, modeling and predicting the formation and movement of dust storms across the global deserts has drawn great attention in recent decades. Nevertheless, the scarcity of real-time observations of the wind-driven emission, transport and deposition of dusts has severely impeded progress in this area. In this study, we report an observational analysis of sand-dust storm samples collected at seven vertical levels from an 80-m-high flux tower located in the hinterland of the great Taklamakan Desert for ten sand-dust storm events that occurred during 2008-2010. We analyzed the vertical distribution of sandstorm particle grain sizes and horizontal sand-dust sediment fluxes from the near surface up to 80 m high in this extremely harsh but highly representative environment. The results showed that the average sandstorm grain size was in the range of 70 to 85 mu m. With the natural presence of sand dunes and valleys, the horizontal dust flux appeared to increase with height within the lower surface layer, but was almost invariant above 32 m. The average flux values varied within the range of 8 to 14 kg m(-2) and the vertical distribution was dominated by the wind speed in the boundary layer. The dominant dust particle size was PM100 and below, which on average accounted for 60-80 % of the samples collected, with 0.9-2.5 % for PM0-2.5, 3.5-7.0 % for PM0-10, 5.0-14.0 % for PM0-20 and 20.0-40.0 % for PM0-50. The observations suggested that on average the sand-dust vertical flux potential is about 0.29 kg m(-2) from the top of the 80 m tower to the upper planetary boundary layer and free atmosphere through the transport of particles smaller than PM20. Some of our results differed from previous measurements from other desert surfaces and laboratory wind-dust experiments, and therefore provide valuable observations to support further improvement of modeling of sandstorms across different natural environmental conditions.
机译：近几十年来，监视，建模和预测沙尘暴在全球沙漠中的形成和移动已经引起了极大的关注。然而，由于缺乏对风的尘埃排放，运输和沉积的实时观测的严重限制，阻碍了这一领域的发展。在这项研究中，我们报告了从位于塔克拉玛干沙漠腹地的80米高通量塔中七个垂直高度采集的沙尘暴样本的观测分析，该沙尘暴样本是针对2008- 2010。我们分析了在这种极其恶劣但具有代表性的环境中，沙尘暴颗粒尺寸的垂直分布和从近地表到80 m高的水平沙尘沉积物通量。结果表明，沙尘暴的平均粒径在70至85微米之间。由于沙丘和山谷的自然存在，水平尘埃通量似乎随着下表层内高度的增加而增加，但在32 m以上几乎不变。平均通量值在8至14 kg m（-2）的范围内变化，垂直分布受边界层中的风速支配。主要灰尘颗粒尺寸为PM100及以下，平均占收集样品的60-80％，其中PM0-2.5为0.9-2.5％，PM0-10为3.5-7.0％，PM0-为5.0-14.0％对于PM0-50为20和20.0-40.0％。观测结果表明，从80 m塔的顶部到行星上边界层和自由大气，通过传输小于PM20的颗粒，平均沙尘垂直通量势约为0.29 kg m（-2）。我们的某些结果与之前在其他沙漠表面和实验室风尘实验中得到的测量结果不同，因此提供了宝贵的观察结果，以支持在不同自然环境条件下沙尘暴建模的进一步改进。

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  • 来源
    《Theoretical and applied climatology》 |2017年第4期|735-746|共12页
  • 作者

    Huo Wen; He Qing; Yang Fan; Yang Xinghua; Yang Qing; Zhang Fuyin; Mamtimin Ali; Liu Xinchun; Wang Mingzhong; Zhao Yong; Zhi Xiefei;

  • 作者单位

    Nanjing Univ Informat Sci & Technol, Key Lab Meteorol Disaster, Minist Educ KLME, Nanjing 210044, Jiangsu, Peoples R China|China Meteorol Adm, Inst Desert Meteorol, Urumqi 830002, Peoples R China|Taklamakan Desert Atmosphere & Environm Observat, Xinjiang, Tazhong, Peoples R China;

    China Meteorol Adm, Inst Desert Meteorol, Urumqi 830002, Peoples R China|Taklamakan Desert Atmosphere & Environm Observat, Xinjiang, Tazhong, Peoples R China;

    China Meteorol Adm, Inst Desert Meteorol, Urumqi 830002, Peoples R China|Taklamakan Desert Atmosphere & Environm Observat, Xinjiang, Tazhong, Peoples R China;

    Nanjing Univ Informat Sci & Technol, Key Lab Meteorol Disaster, Minist Educ KLME, Nanjing 210044, Jiangsu, Peoples R China|China Meteorol Adm, Inst Desert Meteorol, Urumqi 830002, Peoples R China|Taklamakan Desert Atmosphere & Environm Observat, Xinjiang, Tazhong, Peoples R China;

    China Meteorol Adm, Inst Desert Meteorol, Urumqi 830002, Peoples R China|Taklamakan Desert Atmosphere & Environm Observat, Xinjiang, Tazhong, Peoples R China;

    Nanjing Univ Informat Sci & Technol, Key Lab Meteorol Disaster, Minist Educ KLME, Nanjing 210044, Jiangsu, Peoples R China;

    China Meteorol Adm, Inst Desert Meteorol, Urumqi 830002, Peoples R China|Taklamakan Desert Atmosphere & Environm Observat, Xinjiang, Tazhong, Peoples R China;

    China Meteorol Adm, Inst Desert Meteorol, Urumqi 830002, Peoples R China|Taklamakan Desert Atmosphere & Environm Observat, Xinjiang, Tazhong, Peoples R China;

    China Meteorol Adm, Inst Desert Meteorol, Urumqi 830002, Peoples R China|Taklamakan Desert Atmosphere & Environm Observat, Xinjiang, Tazhong, Peoples R China;

    China Meteorol Adm, Inst Desert Meteorol, Urumqi 830002, Peoples R China|Taklamakan Desert Atmosphere & Environm Observat, Xinjiang, Tazhong, Peoples R China;

    Nanjing Univ Informat Sci & Technol, Key Lab Meteorol Disaster, Minist Educ KLME, Nanjing 210044, Jiangsu, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Sandstorm; Taklamakan desert; Grain size; Vertical profiles;

    机译：沙尘暴;塔克拉玛干沙漠;粒度;垂直剖面;

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