Abstract
The effects of nitric acid vapor on the formation of cloud droplets in tropospheric conditions are studied in this work. The concentration of nitric acid in the polluted areas can be hundred times to that in the background areas. The effects of the changing cloud droplets concentration on the shortwave radiative properties of the cloud are also briefly studied. The formation of the cloud droplets is studied with an air parcel model describing the formation of a convective cloud. The simultaneous condensation of water and nitric acid vapour on the soluble sodium nitrate (NaNO{sub 3}) particles is included in the model. The formation of the cloud droplets is simulated with different initial aerosol particle distributions and initial nitric acid concentrations. The concentrations of aerosol particles and nitric acid are varied from measured background values to values measured in heavily polluted areas. The properties of the simulated cloud, such as liquid water content, supersaturation of water vapor, the vertical velocity of rising air parcel and the amount of nitrate ions in the droplets, are compared to measured values and they have been found to be quite realistic. According to the obtained results the increase of the concentration of nitric acid vapor
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Korhonen, P
[1]
- Helsinki Univ. (Finland). Dept. of Physics
Citation Formats
Korhonen, P.
Effects of nitric acid vapor on the formation of cloud droplets in troposphere; Kaasumaisen typpihapon vaikutus pilvipisaroiden muodostumiseen troposfaeaerissae.
Finland: N. p.,
1993.
Web.
Korhonen, P.
Effects of nitric acid vapor on the formation of cloud droplets in troposphere; Kaasumaisen typpihapon vaikutus pilvipisaroiden muodostumiseen troposfaeaerissae.
Finland.
Korhonen, P.
1993.
"Effects of nitric acid vapor on the formation of cloud droplets in troposphere; Kaasumaisen typpihapon vaikutus pilvipisaroiden muodostumiseen troposfaeaerissae."
Finland.
@misc{etde_10120052,
title = {Effects of nitric acid vapor on the formation of cloud droplets in troposphere; Kaasumaisen typpihapon vaikutus pilvipisaroiden muodostumiseen troposfaeaerissae}
author = {Korhonen, P}
abstractNote = {The effects of nitric acid vapor on the formation of cloud droplets in tropospheric conditions are studied in this work. The concentration of nitric acid in the polluted areas can be hundred times to that in the background areas. The effects of the changing cloud droplets concentration on the shortwave radiative properties of the cloud are also briefly studied. The formation of the cloud droplets is studied with an air parcel model describing the formation of a convective cloud. The simultaneous condensation of water and nitric acid vapour on the soluble sodium nitrate (NaNO{sub 3}) particles is included in the model. The formation of the cloud droplets is simulated with different initial aerosol particle distributions and initial nitric acid concentrations. The concentrations of aerosol particles and nitric acid are varied from measured background values to values measured in heavily polluted areas. The properties of the simulated cloud, such as liquid water content, supersaturation of water vapor, the vertical velocity of rising air parcel and the amount of nitrate ions in the droplets, are compared to measured values and they have been found to be quite realistic. According to the obtained results the increase of the concentration of nitric acid vapor from background values (0.1 ppbv) ease remarkably the formation of cloud droplets. This leads to the higher amount of smaller cloud droplets in the forming cloud. The rise of the amount of nitric acid from the used background value to the 1 ppbv increased the amount of the cloud droplets so, that the albedo of the thin cloud layer (less than 1 km) was clearly increased and its absorbtivity was somewhat decreased}
place = {Finland}
year = {1993}
month = {Dec}
}
title = {Effects of nitric acid vapor on the formation of cloud droplets in troposphere; Kaasumaisen typpihapon vaikutus pilvipisaroiden muodostumiseen troposfaeaerissae}
author = {Korhonen, P}
abstractNote = {The effects of nitric acid vapor on the formation of cloud droplets in tropospheric conditions are studied in this work. The concentration of nitric acid in the polluted areas can be hundred times to that in the background areas. The effects of the changing cloud droplets concentration on the shortwave radiative properties of the cloud are also briefly studied. The formation of the cloud droplets is studied with an air parcel model describing the formation of a convective cloud. The simultaneous condensation of water and nitric acid vapour on the soluble sodium nitrate (NaNO{sub 3}) particles is included in the model. The formation of the cloud droplets is simulated with different initial aerosol particle distributions and initial nitric acid concentrations. The concentrations of aerosol particles and nitric acid are varied from measured background values to values measured in heavily polluted areas. The properties of the simulated cloud, such as liquid water content, supersaturation of water vapor, the vertical velocity of rising air parcel and the amount of nitrate ions in the droplets, are compared to measured values and they have been found to be quite realistic. According to the obtained results the increase of the concentration of nitric acid vapor from background values (0.1 ppbv) ease remarkably the formation of cloud droplets. This leads to the higher amount of smaller cloud droplets in the forming cloud. The rise of the amount of nitric acid from the used background value to the 1 ppbv increased the amount of the cloud droplets so, that the albedo of the thin cloud layer (less than 1 km) was clearly increased and its absorbtivity was somewhat decreased}
place = {Finland}
year = {1993}
month = {Dec}
}