Experimental analysis of dust deposition and physical weathering intensity in the Gobi Desert

IF 1.8 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Xunming Wang, Danfeng Li, Bingqi Zhu, Zhenting Wang, Caixia Zhang, Xin Geng, Likun Han, Yang Zheng, Diwen Cai
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Abstract

Surface soil materials from the Gobi Desert were sieved into fraction groups of 0.063–0.125, 0.125–0.25, 0.25–0.5, 0.5–1, and 1–2 mm. These samples were placed in a field for a physical weathering and dust deposition experiment. In the natural Gobi Desert environment, the dust-sized fractions (< 0.063 mm in diameter) produced by physical weathering and via dust deposition in the above groups were 1387 ± 124, 702 ± 70, 698 ± 47, 742 ± 101, and 769 ± 75 gm−2, respectively, from 18 October 2020 to 18 December 2021. Dust deposition during the same period was 611 ± 55 gm−2. For the same respective groups, 5.32 ± 0.76%, 0.58 ± 0.27%, 0.53 ± 0.18%, 0.80 ± 0.52%, and 0.98 ± 0.31% (by weight) of the bulk samples were weathered into dust-sized fractions during the experimental period. The physical weathering intensities were 23.95%, 14.96%, 8.90%, and 2.81% by weight for fraction groups of 2–4, 4–8, 8–16, and > 16 mm, respectively. The fine-grained materials of the gravel were more sensitive to physical weathering than coarse materials. In natural environments, the processes of dust deposition and physical weathering were key factors affecting the surface topographical equilibrium of the Gobi Desert and dust emission in Asia.

戈壁滩灰尘沉积和物理风化强度的实验分析
戈壁滩的表层土壤材料被筛分成 0.063-0.125 毫米、0.125-0.25 毫米、0.25-0.5 毫米、0.5-1 毫米和 1-2 毫米的颗粒组。这些样本被放置在野外进行物理风化和灰尘沉积实验。在戈壁滩自然环境中,2020 年 10 月 18 日至 2021 年 12 月 18 日期间,上述各组样品通过物理风化和粉尘沉积产生的粉尘粒径(< 0.063 mm)分别为 1387 ± 124、702 ± 70、698 ± 47、742 ± 101 和 769 ± 75 gm-2。同期的粉尘沉积量为 611 ± 55 gm-2。在实验期间,同一组样品中分别有 5.32 ± 0.76%、0.58 ± 0.27%、0.53 ± 0.18%、0.80 ± 0.52% 和 0.98 ± 0.31%(按重量计)的块状样品被风化成粉尘大小的馏分。按重量计,2-4、4-8、8-16 和 > 16 毫米馏分组的物理风化强度分别为 23.95%、14.96%、8.90% 和 2.81%。与粗粒材料相比,砾石中的细粒材料对物理风化更为敏感。在自然环境中,沙尘沉积和物理风化过程是影响亚洲戈壁滩地表地形平衡和沙尘排放的关键因素。
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来源期刊
Frontiers of Earth Science
Frontiers of Earth Science GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.50
自引率
5.00%
发文量
627
期刊介绍: Frontiers of Earth Science publishes original, peer-reviewed, theoretical and experimental frontier research papers as well as significant review articles of more general interest to earth scientists. The journal features articles dealing with observations, patterns, processes, and modeling of both innerspheres (including deep crust, mantle, and core) and outerspheres (including atmosphere, hydrosphere, and biosphere) of the earth. Its aim is to promote communication and share knowledge among the international earth science communities
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