Sorting characteristics and its implication of the grain size of modern atmospheric dust deposition near the surface of the Cele Oasis， Xinjiang， China

doi:10.7522/j.issn.1000-694X.2021.00140

Journal of Desert Research ›› 2022, Vol. 42 ›› Issue (1): 139-146.DOI: 10.7522/j.issn.1000-694X.2021.00140

Sorting characteristics and its implication of the grain size of modern atmospheric dust deposition near the surface of the Cele Oasis， Xinjiang， China

Yongchong Lin¹(), Guijin Mu², Liling Chen¹, Chuna Wu¹, Lishuai Xu³^,⁴()

^1.School of History and Geography，Minnan Normal University，Zhangzhou 363500，Fujiang，China
^2.State Key Laboratory of Desert and Oasis Ecology，Xinjiang Institute of Ecology and Geography，Chinese Academy of Sciences，Urumqi 830011，China
^3.College of Resources and Environment，Shanxi Agricultural University，Taigu 030801，Shanxi，China
^4.Institute of Desert Meteorology，China Meteorological Administration，Urumqi 830002，China

Received:2021-07-19 Revised:2021-10-09 Online:2022-01-20 Published:2022-01-28
Contact: Lishuai Xu

Abstract

Abstract:

Aeolian deposits often exhibit bimodal grain size distribution characteristics， and different sub-peaks indicate different sedimentary sorting processes. It has not been confirmed by modern atmospheric dust fall observations that whether the grain size characteristics， being caused by sedimentary sorting， exhibits stability. This study attempts to reveal the spatial variation characteristics of aeolian deposits by sampling two phases atmospheric dust falls at 11 spots at 3 m and 0.5 m heights and analyzing the grain size characteristics. The results show that in both periods of atmospheric dust fall， the grain size ranges from 0.4 μm to 250 μm at the two heights， and the deposited dusts exhibit typical bimodal grain size distribution characteristics， which with main modal size of 67-75 μm and secondary modal size of 12-21 μm. The coarse-grained peaks （or fine-grained peaks） show consistent grain size distribution characteristics at 11 spots and two heights. This indicates that they experience stable and consistent sedimentary sorting in the near-surface. Therefore， the grain size characteristics of aeolian deposits are suitable for indicating regional sedimentary dynamic environments， and multi-modal separation analysis may indicate environmental information clearer.

Key words: atmospheric dust deposition, grain size, multimodality, sorting

CLC Number:

Yongchong Lin, Guijin Mu, Liling Chen, Chuna Wu, Lishuai Xu. Sorting characteristics and its implication of the grain size of modern atmospheric dust deposition near the surface of the Cele Oasis， Xinjiang， China[J]. Journal of Desert Research, 2022, 42(1): 139-146.

Figures/Tables 6

Fig.1 The study region and distribution of sampling points

Fig.2 Sedimentary flux of atmospheric dust fall during T1 and T2

Fig.3 Grain size distribution curves of atmospheric dust fall during T1 and T2

Fig.4 Fitting and separating result of grain size distribution curves of the atmospheric dust fall

Fig.5 Grain size parameter characteristics of atmospheric dust fall during T1 in 0.5 m and 3 m heights

Fig.6 Grain size parameter characteristics of atmospheric dust fall during T2 in 0.5 m and 3 m heights.

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Sorting characteristics and its implication of the grain size of modern atmospheric dust deposition near the surface of the Cele Oasis， Xinjiang， China

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