A 3-mode parameterization of below-cloud scavenging of aerosols for use in atmospheric dispersion models

Feng, Jian

doi:10.1016/j.atmosenv.2007.04.046

Cited by 68 publications

(80 citation statements)

References 6 publications

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“…This contrasts with estimates of BCS in global or chemistry transport mod-37 els where crude approximations (see a review by Sportisse (2007)) are made 38 about the size distribution of the raindrops or the rainfall rate estimates 39 (Seinfeld and Pandis, 1998;Jacobson, 2003;Loosmore and Cederwall, 2004;40 Tost et al, 2006;Henzing et al, 2006;Feng, 2007) to cite a few. In return,…”

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confidence: 77%

Scavenging of aerosol particles by rain in a cloud resolving model

Berthet

Leriche

Pinty

et al. 2010

Atmospheric Research

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confidence: 77%

Scavenging of aerosol particles by rain in a cloud resolving model

Berthet

Leriche

Pinty

et al. 2010

Atmospheric Research

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“…Previous studies have theoretically determined the CE between droplets and aerosol particles (Slinn and Shen, 1970;Beard, 1974;Grover et al, 1977;Davenport and Peters, 1978;Wang et al, 1978;Park et al, 2005;Tinsley et al, 2000Tinsley et al, , 2006Chate, 2005;Andronache et al, 2006;Feng, 2007;Croft et al, 2009;Tinsley, 2010;Wang et al, 2010;Tinsley and Leddon, 2013). In order to understand our experimental data, we compare them to a theoretical treatment of CE.…”

Section: Theoretical Ce Modelsmentioning

confidence: 98%

Laboratory studies of collection efficiency of sub-micrometer aerosol particles by cloud droplets on a single-droplet basis

2015

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Abstract. An experimental setup has been constructed to measure the collection efficiency (CE) of sub-micrometer aerosol particles by cloud droplets. Droplets of a dilute aqueous ammonium sulfate solution with an average radius of 21.6 µm fall freely into a chamber and collide with sub-micrometer polystyrene latex (PSL) sphere particles of known sizes and concentrations. Two relative humidity (RH) conditions, 15 ± 3 % and 88 ± 3 %, hereafter termed "low" and "high", respectively, were varied with different particles sizes and concentrations. After passing through the chamber, the droplets and aerosol particles were sent to the Particle Analysis by Laser Mass Spectrometry (PALMS) instrument to determine chemical compositions on a single-droplet basis. "Coagulated droplets" (droplets that collected aerosols) had mass spectra that contained signatures from both an aerosol particle and a droplet residual. CE values range from 2.0 × 10 −1 to 1.6 for the low-RH case and from 1.5 × 10 −2 to 9.0 × 10 −2 for the high-RH case. CE values were, within experimental uncertainty, independent of the aerosol concentrations. CE values in this study were found to be in agreement with previous experimental and theoretical studies. To our knowledge, this is the first collection experiment performed on a single-droplet basis with atmospherically relevant conditions such as droplet sizes, droplet charges and flow.

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“…These hydrophilic aerosols partition into cloud water via nucleation or impaction scavenging and are thus scavenged with similarly high efficiency to HNO 3 (Murakami et al, 1983;Jensen and Charlson, 1984;Gillani et al, 1995). Washout by rain and snow below clouds further enhances wet deposition of both soluble gases and aerosols (Levine and Schwartz, 1982;Feng et al, 2007Feng et al, , 2009. Prior studies also show the viability of utilizing cloud-resolving models in understanding processes related to removal and transport of trace species by convective storms (Barth et al, 2007;Halland et al, 2009).…”

Section: Introductionmentioning

confidence: 94%

Cloud-resolving simulations of mercury scavenging and deposition in thunderstorms

Nair

Holmes

et al. 2013

Atmos. Chem. Phys.

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Abstract. This study examines dynamical and microphysical features of convective clouds that affect mercury (Hg) wet scavenging and concentrations in rainfall. Using idealized numerical model simulations in the Regional Atmospheric Modeling System (RAMS), we diagnose vertical transport and scavenging of soluble Hg species -gaseous oxidized mercury (GOM) and particle-bound mercury (HgP), collectively Hg(II) -in thunderstorms under typical environmental conditions found in the Northeast and Southeast United States (US). Mercury scavenging efficiencies from various initial altitudes are diagnosed for a case study of a typical strong convective storm in the Southeast US. Assuming that soluble mercury concentrations are initially vertically uniform, the model results suggest that 60 % of mercury deposited to the surface in rainwater originates from above the boundary layer (> 2 km). The free troposphere could supply a larger fraction of mercury wet deposition if GOM and HgP concentrations increase with altitude. We use radiosonde observations in the Northeast and Southeast to characterize three important environmental characteristics that influence thunderstorm morphology: convective available potential energy (CAPE), vertical shear (0-6 km) of horizontal wind (SHEAR) and precipitable water (PW). The Southeast US generally has lower SHEAR and higher CAPE and PW. We then use RAMS to test how PW and SHEAR impact mercury scavenging and deposition, while keeping the initial Hg(II) concentrations fixed in all experiments. We found that the mercury concentration in rainfall is sensitive to SHEAR with the nature of sensitivity differing depending upon the PW. Since CAPE and PW cannot be perturbed independently, we test their combined influence using an ensemble of thunderstorm simulations initialized with environmental conditions for the Northeast and Southeast US. These simulations, which begin with identical Hg(II) concentrations, predict higher mercury concentrations in rainfall from thunderstorms forming in the environmental conditions over the Southeast US compared to the Northeast US. A final simulation of a stratiform rain event produces lower mercury concentrations than in thunderstorms forming in environments typical of the Southeast US. The stratiform cloud scavenges mercury from the lowest ∼ 4 km of the atmosphere, while thunderstorms scavenge up to ∼ 10 km.

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A 3-mode parameterization of below-cloud scavenging of aerosols for use in atmospheric dispersion models

Cited by 68 publications

References 6 publications

Scavenging of aerosol particles by rain in a cloud resolving model

Scavenging of aerosol particles by rain in a cloud resolving model

Laboratory studies of collection efficiency of sub-micrometer aerosol particles by cloud droplets on a single-droplet basis

Cloud-resolving simulations of mercury scavenging and deposition in thunderstorms

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