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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/acp-2020-1021
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-1021
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  02 Nov 2020

02 Nov 2020

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This preprint is currently under review for the journal ACP.

Dust emission in farmland caused by aerodynamic entrainment and surface renewal

Hongchao Dun and Ning Huang Hongchao Dun and Ning Huang
  • Key Laboratory of Mechanics on Disaster and Environment in Western China, Lanzhou University, Lanzhou, 730000, China

Abstract. Mineral dust emission is an important physical process related to gas-particle interaction and soil moisture temporal change, which is crucial on global circulation patterns and biogeochemical cycles. The existing dust models are usually semi-empirical functions and far from reliable prediction of dust emission rate ignoring the different phases in dust emission. Here, a dust emission model combined with aerodynamic entrainment and surface renewal mechanisms is established to simulate the physical phased dust emission in farmland. We use a soil moisture transport module to simulate the temporal soil surface moisture, and a simple and feasible scheme to calculate the amount of free grains exposed on soil surface. The model reproduces three typical phases of dust emission: aerodynamic entrainment, dry soil saltation and surface renewal, in which soil moisture is the dominating limiting factor and the dust emission rate remains low. Results show that our model is an effective method to predict the dust emission rate.

Hongchao Dun and Ning Huang

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Hongchao Dun and Ning Huang

Hongchao Dun and Ning Huang

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