Impacts of Sand Weathers and Dust Devils on the Local Dust Emission Amount

doi:10.7522/j.issn.1000-694X.2017.00106

Journal of Desert Research ›› 2018, Vol. 38 ›› Issue (6): 1175-1179.DOI: 10.7522/j.issn.1000-694X.2017.00106

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Impacts of Sand Weathers and Dust Devils on the Local Dust Emission Amount

Liu Ying¹, Han Yongxiang¹, Yang Wenqing², Luo Han³, Liu Ning⁴, Liu Weijia¹

1. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing 210044, China;
2. Minqin Meteorological Station, Minqin 733300, Gansu, China;
3. Gansu Weather Modification Office, Lanzhou 730020, China;
4. Jilin Disaster Prevention and Mitigation Center, Changchun 130000, China

Received:2017-11-28 Revised:2018-01-03 Online:2018-11-20 Published:2018-12-05

Abstract

Abstract: The vertical distribution of the dust aerosols can be reflected from the dustfall. The daily, monthly and annual dust emission amounts are calculated in the present research, based on the boundary layer observation and numerical simulation results conducted by using the WRF/Chem sandstorm model. Dust devil process is considered an important source of the dust emission. The relationship between the dust emission and natural dustfall is then analyzed. The research can be concluded as following:(1) There exists a significant positive correlation between the semi-quantitative number of sandy days and the monthly dustfall, yet further quantization of the dust sources is unavailable;(2) The temporal evolution of the model-calculated dust emission on sandy days and the total dustfall amount show a similar trend. The average contribution of the sand weather to the dust emission is given as 76%;(3) The contribution of dust devils to dust emission is 24%. When there is no sand weather, dust devil is the only source of the dustfall;(4) The monthly and annual variation of the dust emission resulted from sand weather and dust devils are obviously correlated to the variation of the dust fall amount, which both passed the significance test(P<0.001)

Key words: dustfall, sand weather, dust devil, dust emission

CLC Number:

P425.55

Liu Ying, Han Yongxiang, Yang Wenqing, Luo Han, Liu Ning, Liu Weijia. Impacts of Sand Weathers and Dust Devils on the Local Dust Emission Amount[J]. Journal of Desert Research, 2018, 38(6): 1175-1179.

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Impacts of Sand Weathers and Dust Devils on the Local Dust Emission Amount

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