Numerical simulation of chemical and physical properties of cumulus clouds

Technical Report · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5619653

Lee, I Y

Numerical simulations have been carried out with a model consisting of aqueous chemical reactions, and dynamic and microphysical processes of cumulus clouds. The model computes temporal and spatial variations in dynamic parameters, chemical species concentrations, particle spectral evolution, and pH values for drops of different sizes. A preliminary simulation produces dynamic characteristics typical of fair-weather cumulus. The in-cloud decrease in SO/sub 2/ concentration occurs mainly in the upper part of the cloud, where the decrease approaches 50%, while the corresponding SO/sub 2/ decrease in the near-cloud environment is about 9% during the 30 minutes of real time simulation. The dominant SO/sub 2/ oxidation pathway is kinetic oxidation by H/sub 2/O/sub 2/. For the case simulated, the droplet pH ranges between 4.4 and 4.9 for drops larger than about 20 ..mu..m in radius, while the pH of submicron evaporating droplets can decrease below 2.0. 10 refs., 9 figs., 1 tab.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5619653
• Report Number(s): CONF-8505118-1; ON: DE85009744
• Country of Publication: United States
• Language: English

Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMISTRY
CLOUDS
DATA
ECOLOGICAL CONCENTRATION
HYDROGEN COMPOUNDS
HYDROGEN PEROXIDE
INFORMATION
KINETICS
MATHEMATICAL MODELS
NAPAP
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PEROXIDES
PH VALUE
RAIN WATER
REACTION KINETICS
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
THEORETICAL DATA
WATER
WATER CHEMISTRY