DOI: 10.1016/j.atmosenv.2017.12.017
Scopus记录号: 2-s2.0-85038839972
论文题名: Comparison of two different dust emission mechanisms over the Horqin Sandy Land area: Aerosols contribution and size distributions
作者: Ju T ; , Li X ; , Zhang H ; , Cai X ; , Song Y
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2018
卷: 176 起始页码: 82
结束页码: 90
语种: 英语
英文关键词: Cumulative dust flux
; Dust emission mechanism
; Fragmentation theory
; Particle size distribution
Scopus关键词: Aerosols
; Heat convection
; Particle size
; Particle size analysis
; Size distribution
; Dust emission
; Dust flux
; Emission fluxes
; Fragmentation theory
; Friction velocity
; Horqin sandy lands
; Scale invariant
; Thermal convections
; Dust
; aerosol
; aggregation
; comparative study
; convection
; dust
; emission
; flux measurement
; particle size
; saltation
; size distribution
; spatiotemporal analysis
; suspended load
; thermal convection
; aerosol
; air temperature
; Article
; comparative study
; convective turbulent dust emission
; dust
; friction
; Inner Mongolia
; land use
; particle size
; priority journal
; saltation bombardment aggregation disintegration dust emission
; sand
; thermodynamics
; wind
; China
; Horqin Desert
; Naiman
; Nei Monggol
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Dust aerosols (PM10) emission fluxes due to convective turbulent dust emissions (CTDE) and saltation-bombardment and/or aggregation-disintegration dust emissions (SADE) events were comparatively studied using the data obtained from the Naiman station over the Horqin Sandy Land area in Inner Mongolia, China from 2011 to 2015. The annual cumulative dust fluxes released by CTDE events was about one third of that by SADE events, with the order of 103∼104 μg m−2 s−1. The particle size distributions (PSDs) with diameter between 0.1 and 20 μm during CTDE and SADE events over the Horqin Sandy Land area were simulated based on the fragmentation theory, respectively. The results indicated that an improved equation based on fragmentation theory could be applied to describe the PSDs over the Horqin site which may be because the scale-invariant fragmentation theory mainly explains the PSDs of free dust particles on the surface, which differ from the PSDs of suspend airborne dust and the improved equation was more applicable to the PSDs of SADE events because the dust emission mechanism of SADE are saltation bombardment and aggregation disintegration. The number-related mean aerosol diameters (DN) barely varied under different friction velocity (u*) for SADE events, while the volume-related mean aerosol diameters (DV) changed distinctly with the change of u*. For CTDE events, the DN and DV had no obvious relationship with the change of u* because the dominating influence factor during CTDE event was thermal convection rather than u*. The mass-related PSDs usually exhibited a peak between 0.45 and 0.70 μm during SADE events, while for CTDE events there was a wide peak in the range of 0.10~0.70μm. The results suggest that DN should be not be recommended as an individual parameter to describe the PSDs. The mass-related PSDs can effectively distinguish the SADE and CTDE events. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83003
Appears in Collections: 气候变化事实与影响
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作者单位: Laboratory for Climate and Ocean-Atmosphere Studies, Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, No.5 Yiheyuan Road Haidian District, Beijing, China; Institute of Atmospheric Environment, China Meteorological Administration, No. 388 Changbai South Road, Heping District, Shenyang, China; State Key Joint Laboratory of Environmental Simulation and Pollution Control, Department of Environment Science, College of Environmental Science, Peking University, No.5 Yiheyuan Road Haidian District, Beijing, China
Recommended Citation:
Ju T,, Li X,, Zhang H,et al. Comparison of two different dust emission mechanisms over the Horqin Sandy Land area: Aerosols contribution and size distributions[J]. Atmospheric Environment,2018-01-01,176