Sand transport characteristics above gobi surface during a dust storm in northern China
Received date: 2022-05-25
Revised date: 2022-08-05
Online published: 2023-04-12
The effect of dust storm on human living and production do not speak for themselves. Dust storm occurrence days decreased in recently 70 years， but it had been obviously increased since 2021， and attracted a lot of attentions. However， all the published papers were based on simulation or dust geochemistry， and almost no field data. We used field measurement of sand transport， PM10 concentration and transported aeolian sediment grain size to explain the dust hazard in the dust sources during a strong dust storm. Our results indicated that： （1） Wind velocity was much larger in the dust sources than national weather station data. （2） PM10 concentration can reach to 100 mg·m-3， and is also larger than national measured data. （3） Sand transport reached to 10 kg·m-1·h-1， and dust can be transported longer distance. （4） The mean grain size of transported aeolian material was 0.07 mm， and coarse sand frequency can reach to 9%， and PM10 frequency can reach to 8%. Coarse sand impacted on erodible land surface and caused more dust come into air and supplemented dust concentration in the sources. （5） Sand transport rate increased about 2 times， PM10 concentration increased 2.90 time， and PM10 frequency increased 1.29 time on disturbed land surface than undisturbed land surface， which means that protected gobi land surface can greatly decreased dust material during dust storm.
Key words： dust storm; PM10; sand transport rate; grain size
Zhengcai Zhang , Kaijia Pan , Yan Zhang , Lanying Han . Sand transport characteristics above gobi surface during a dust storm in northern China[J]. Journal of Desert Research, 2023 , 43(2) : 130 -138 . DOI: 10.7522/j.issn.1000-694X.2022.00096
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