Cell model of in-cloud scavenging of highly soluble gases

Alexander Baklanov; Tov Elperin; Andrew Fominykh; Boris Krasovitov

doi:10.1016/j.jastp.2013.02.018

Cell model of in-cloud scavenging of highly soluble gases

Alexander Baklanov^*, Tov Elperin, Andrew Fominykh, Boris Krasovitov

^*Corresponding author af dette arbejde

7 Citationer (Scopus)

Abstract

We investigate mass transfer during absorption of highly soluble gases such as HNO₃, H₂O₂ by stagnant cloud droplets in the presence of inert admixtures. Thermophysical properties of the gases and liquids are assumed to be constant. Diffusion interactions between droplets, caused by the overlap of depleted of soluble gas regions around the neighboring droplets, are taken into account in the approximation of a cellular model of a gas-droplet suspension whereby a suspension is viewed as a periodic structure consisting of the identical spherical cells with periodic boundary conditions at the cell boundary. Using this model we determined temporal and spatial dependencies of the concentration of the soluble trace gas in a gaseous phase and in a droplet and calculated the dependence of the scavenging coefficient on time. We found that scavenging coefficient for gas absorption by cloud droplets remains constant and sharply decreases only at the final stage of absorption. In the calculations we employed a Monte Carlo method and assumed gamma size distribution of cloud droplets. It is shown that despite of the comparable values of Henry's law constants for the hydrogen peroxide (H₂O₂) and the nitric acid (HNO₃), the nitric acid is scavenged more effectively by cloud droplets than the hydrogen peroxide due to a major affect of the dissociation reaction on HNO₃ scavenging. It is demonstrated that scavenging of highly soluble gases by cloud droplets leads to strong decrease of soluble trace gas concentration in the interstitial air. We obtained also analytical expressions for the "equilibrium values" of concentration of the soluble trace gas in a gaseous phase and for concentration of the dissolved gas in a liquid phase for the case of hydrogen peroxide and nitric acid absorption by cloud droplets.

Originalsprog	Engelsk
Tidsskrift	Journal of Atmospheric and Solar-Terrestrial Physics
Vol/bind	97
Sider (fra-til)	135-142
Antal sider	8
ISSN	1364-6826
DOI	https://doi.org/10.1016/j.jastp.2013.02.018
Status	Udgivet - 1 maj 2013
Udgivet eksternt	Ja

Adgang til dokumentet

10.1016/j.jastp.2013.02.018

Andre filer og links

Link to publication in Scopus

Citationsformater

@article{f7e5ed8dd92c4b6c82ebd14b0102b604,

title = "Cell model of in-cloud scavenging of highly soluble gases",

abstract = "We investigate mass transfer during absorption of highly soluble gases such as HNO3, H2O2 by stagnant cloud droplets in the presence of inert admixtures. Thermophysical properties of the gases and liquids are assumed to be constant. Diffusion interactions between droplets, caused by the overlap of depleted of soluble gas regions around the neighboring droplets, are taken into account in the approximation of a cellular model of a gas-droplet suspension whereby a suspension is viewed as a periodic structure consisting of the identical spherical cells with periodic boundary conditions at the cell boundary. Using this model we determined temporal and spatial dependencies of the concentration of the soluble trace gas in a gaseous phase and in a droplet and calculated the dependence of the scavenging coefficient on time. We found that scavenging coefficient for gas absorption by cloud droplets remains constant and sharply decreases only at the final stage of absorption. In the calculations we employed a Monte Carlo method and assumed gamma size distribution of cloud droplets. It is shown that despite of the comparable values of Henry's law constants for the hydrogen peroxide (H2O2) and the nitric acid (HNO3), the nitric acid is scavenged more effectively by cloud droplets than the hydrogen peroxide due to a major affect of the dissociation reaction on HNO3 scavenging. It is demonstrated that scavenging of highly soluble gases by cloud droplets leads to strong decrease of soluble trace gas concentration in the interstitial air. We obtained also analytical expressions for the {"}equilibrium values{"} of concentration of the soluble trace gas in a gaseous phase and for concentration of the dissolved gas in a liquid phase for the case of hydrogen peroxide and nitric acid absorption by cloud droplets.",

keywords = "Atmospheric chemistry, Gas absorption, Highly soluble gases, In-cloud scavenging, Scavenging coefficient",

author = "Alexander Baklanov and Tov Elperin and Andrew Fominykh and Boris Krasovitov",

year = "2013",

month = may,

day = "1",

doi = "10.1016/j.jastp.2013.02.018",

language = "English",

volume = "97",

pages = "135--142",

journal = "Journal of Atmospheric and Solar-Terrestrial Physics",

issn = "1364-6826",

publisher = "Elsevier",

}

TY - JOUR

T1 - Cell model of in-cloud scavenging of highly soluble gases

AU - Baklanov, Alexander

AU - Elperin, Tov

AU - Fominykh, Andrew

AU - Krasovitov, Boris

PY - 2013/5/1

Y1 - 2013/5/1

N2 - We investigate mass transfer during absorption of highly soluble gases such as HNO3, H2O2 by stagnant cloud droplets in the presence of inert admixtures. Thermophysical properties of the gases and liquids are assumed to be constant. Diffusion interactions between droplets, caused by the overlap of depleted of soluble gas regions around the neighboring droplets, are taken into account in the approximation of a cellular model of a gas-droplet suspension whereby a suspension is viewed as a periodic structure consisting of the identical spherical cells with periodic boundary conditions at the cell boundary. Using this model we determined temporal and spatial dependencies of the concentration of the soluble trace gas in a gaseous phase and in a droplet and calculated the dependence of the scavenging coefficient on time. We found that scavenging coefficient for gas absorption by cloud droplets remains constant and sharply decreases only at the final stage of absorption. In the calculations we employed a Monte Carlo method and assumed gamma size distribution of cloud droplets. It is shown that despite of the comparable values of Henry's law constants for the hydrogen peroxide (H2O2) and the nitric acid (HNO3), the nitric acid is scavenged more effectively by cloud droplets than the hydrogen peroxide due to a major affect of the dissociation reaction on HNO3 scavenging. It is demonstrated that scavenging of highly soluble gases by cloud droplets leads to strong decrease of soluble trace gas concentration in the interstitial air. We obtained also analytical expressions for the "equilibrium values" of concentration of the soluble trace gas in a gaseous phase and for concentration of the dissolved gas in a liquid phase for the case of hydrogen peroxide and nitric acid absorption by cloud droplets.

AB - We investigate mass transfer during absorption of highly soluble gases such as HNO3, H2O2 by stagnant cloud droplets in the presence of inert admixtures. Thermophysical properties of the gases and liquids are assumed to be constant. Diffusion interactions between droplets, caused by the overlap of depleted of soluble gas regions around the neighboring droplets, are taken into account in the approximation of a cellular model of a gas-droplet suspension whereby a suspension is viewed as a periodic structure consisting of the identical spherical cells with periodic boundary conditions at the cell boundary. Using this model we determined temporal and spatial dependencies of the concentration of the soluble trace gas in a gaseous phase and in a droplet and calculated the dependence of the scavenging coefficient on time. We found that scavenging coefficient for gas absorption by cloud droplets remains constant and sharply decreases only at the final stage of absorption. In the calculations we employed a Monte Carlo method and assumed gamma size distribution of cloud droplets. It is shown that despite of the comparable values of Henry's law constants for the hydrogen peroxide (H2O2) and the nitric acid (HNO3), the nitric acid is scavenged more effectively by cloud droplets than the hydrogen peroxide due to a major affect of the dissociation reaction on HNO3 scavenging. It is demonstrated that scavenging of highly soluble gases by cloud droplets leads to strong decrease of soluble trace gas concentration in the interstitial air. We obtained also analytical expressions for the "equilibrium values" of concentration of the soluble trace gas in a gaseous phase and for concentration of the dissolved gas in a liquid phase for the case of hydrogen peroxide and nitric acid absorption by cloud droplets.

KW - Atmospheric chemistry

KW - Gas absorption

KW - Highly soluble gases

KW - In-cloud scavenging

KW - Scavenging coefficient

UR - http://www.scopus.com/inward/record.url?scp=84875852338&partnerID=8YFLogxK

U2 - 10.1016/j.jastp.2013.02.018

DO - 10.1016/j.jastp.2013.02.018

M3 - Journal article

AN - SCOPUS:84875852338

SN - 1364-6826

VL - 97

SP - 135

EP - 142

JO - Journal of Atmospheric and Solar-Terrestrial Physics

JF - Journal of Atmospheric and Solar-Terrestrial Physics

ER -

Cell model of in-cloud scavenging of highly soluble gases

Abstract

Adgang til dokumentet

Andre filer og links

Fingeraftryk

Citationsformater