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- W3004369887 abstract "Abstract Dust aerosols ( PM 10 ) 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 ( D N ) barely varied under different friction velocity ( u * ) for SADE events, while the volume-related mean aerosol diameters ( D V ) changed distinctly with the change of u * . For CTDE events, the D N and D V 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 ~ 0.70 μm . The results suggest that D N 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." @default.
- W3004369887 created "2020-02-07" @default.
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- W3004369887 date "2018-04-01" @default.
- W3004369887 modified "2023-09-23" @default.
- W3004369887 title "Comparison of two different dust emission mechanisms over the Horqin Sandy Land area: aerosols contribution and size distributions" @default.
- W3004369887 hasPublicationYear "2018" @default.
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