![](/images/graphics-bg.png)
Correlation of Dry Deposition Velocity and Friction Velocity over Different Surfaces for PM2.5 and Particle Number Concentrations
Joint Authors
Contini, Daniele
Donateo, Antonio
Source
Issue
Vol. 2014, Issue 2014 (31 Dec. 2014), pp.1-12, 12 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2014-06-01
Country of Publication
Egypt
No. of Pages
12
Main Subjects
Abstract EN
Dry deposition of particles is an important way of aerosol removal from the atmosphere and a key process in surface-atmosphere exchanges.
The deposition velocities, Vd, are often parameterised in air quality and climate modelling as function of the friction velocity, u*, atmospheric stability, and particle size (if size-segregated information is available).
In this work, a study of the correlation between Vd and u* over different surfaces is presented for both PM2.5 and particle number fluxes.
Results indicate an almost linear increase of Vd with u* with slopes similar for PM2.5 fluxes and particle number fluxes over the different surfaces analysed.
This means that the ratios Vd/u* tend to collapse over similar values even if Vd and u* are significantly different because u* take into account most of the surface effects.
There is a limited difference between stable cases and unstable/neutral cases with slightly lower deposition velocities in stable cases for fixed values of u*.
The average value of Vd/u* is 0.010 ± 0.0017 (median 0.0062 ± 0.0015) (considering all stabilities) and 0.0097 ± 0.002 (median 0.005 ± 0.001) for stable cases.
This could be the base for an empirical parameterisation of deposition velocities in air quality models.
American Psychological Association (APA)
Donateo, Antonio& Contini, Daniele. 2014. Correlation of Dry Deposition Velocity and Friction Velocity over Different Surfaces for PM2.5 and Particle Number Concentrations. Advances in Meteorology،Vol. 2014, no. 2014, pp.1-12.
https://search.emarefa.net/detail/BIM-496600
Modern Language Association (MLA)
Donateo, Antonio& Contini, Daniele. Correlation of Dry Deposition Velocity and Friction Velocity over Different Surfaces for PM2.5 and Particle Number Concentrations. Advances in Meteorology No. 2014 (2014), pp.1-12.
https://search.emarefa.net/detail/BIM-496600
American Medical Association (AMA)
Donateo, Antonio& Contini, Daniele. Correlation of Dry Deposition Velocity and Friction Velocity over Different Surfaces for PM2.5 and Particle Number Concentrations. Advances in Meteorology. 2014. Vol. 2014, no. 2014, pp.1-12.
https://search.emarefa.net/detail/BIM-496600
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-496600