Parameterization of Aerosol Scavenging Due to Atmospheric Ionization Under Varying Relative Humidity

Simple item page
dc.contributor.ISNI0000 0003 7214 6140 (Tinsley, BA)en_US
dc.contributor.authorZhang, Liangen_US
dc.contributor.authorTinsley, Brian A.en_US
dc.contributor.utdAuthorZhang, Liangen_US
dc.contributor.utdAuthorTinsley, Brian A.en_US
dc.date.accessioned2018-09-24T15:58:42Z
dc.date.available2018-09-24T15:58:42Z
dc.date.created2017-04-12
dc.date.issued2017-04-12en_US
dc.description.abstractSimulations and parameterizations of the modulation of aerosol scavenging by electric charges on particles and droplets for different relative humidities have been made for 3 mu m radii droplets and a wide range of particle radii. For droplets and particles with opposite-sign charges, the attractive Coulomb force increases the collision rate coefficients above values due to other forces. With same-sign charges, the repulsive Coulomb force decreases the rate coefficients, and the short-range attractive image forces become important. The phoretic forces are attractive for relative humidity less than 100% and repulsive for relative humidity greater than 100% and have increasing overall effect for particle radii up to about 1 mu m. There is an analytic solution for rate coefficients if only inverse square forces are present, but due to the presence of image forces, and for larger particles the intercept, weight, and the flow around the particle affecting the droplet trajectory, the simulated results usually depart far from the analytic solution. We give simple empirical parameterization formulas for some cases and more complex parameterizations for more exact fits to the simulated results. The results can be used in cloud models with growing droplets, as in updrafts, as well as with evaporating droplets in downdrafts. There is considered to be little scavenging of uncharged ice-forming nuclei in updrafts, but with charged ice-forming nuclei it is possible for scavenging in updrafts in cold clouds to produce contact ice nucleation. Scavenging in updrafts below the freezing level produces immersion nuclei that promote enhanced freezing as droplets rise above it.en_US
dc.description.departmentSchool of Natural Sciences and Mathematicsen_US
dc.description.sponsorshipU.S. National Science Foundation grant AGS 0836171en_US
dc.identifier.bibliographicCitationZhang, Liang, and Brian A. Tinsley. 2017. "Parameterization of aerosol scavenging due to atmospheric ionization under varying relative humidity." Journal of Geophysical Research--Atmospheres 122(10), doi:10.1002/2016JD026255en_US
dc.identifier.issn2169-897Xen_US
dc.identifier.issue10en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/6143
dc.identifier.volume122en_US
dc.language.isoenen_US
dc.publisherAmer Geophysical Unionen_US
dc.relation.urihttp://dx.doi.org/10.1002/2016JD026255
dc.rights©2017 American Geophysical Union. All Rights Reserved.en_US
dc.sourceJournal of Geophysical Research--Atmospheres
dc.subjectPrecipitationen_US
dc.subjectDropletsen_US
dc.subjectMeteorology & atmospheric sciencesen_US
dc.subjectMicrophysicsen_US
dc.subjectElectric charge and distributionen_US
dc.subjectCloudsen_US
dc.subjectAtmospheric aerosolsen_US
dc.subjectPrecipitation scavenging--Experimentsen_US
dc.subjectAtmospheric ionizationen_US
dc.titleParameterization of Aerosol Scavenging Due to Atmospheric Ionization Under Varying Relative Humidityen_US
dc.type.genrearticleen_US

Files

Original bundle

Now showing 1 - 1 of 1
Thumbnail Image
Name:
NSM-6084-8313.88.pdf
Size:
1.48 MB
Format:
Adobe Portable Document Format
Description:
Article
Download

License bundle

Now showing 1 - 1 of 1
No Thumbnail Available
Name:
American Geophysical Union.pdf
Size:
12.97 KB
Format:
Adobe Portable Document Format
Description:
Download

Collections

Tinsley, Brian A.