Application and sensitivity studies of the orographic cloud model MCCP (Mountain Cloud Chemistry Program) PLUVIUS
A special MCCP version of the PLUVIUS MOD 5.0 reactive storm model (MCCP PLUVIUS) was applied to conditions representative of Mt. Mitchell, North Carolina. Tests were also conducted to determine the sensitivity of the model to various meteorological and chemical parameters. Results of the modeling investigation indicate that aqueous concentrations and deposition fluxes of pollutants are location dependent. The greatest concentrations occur at the edges of the cloud, where the liquid water content is low, and the greatest deposition flux occurs on the windward side of the mountain. For conditions considered representative of summertime conditions at Mt. Mitchell, predicted ion concentrations in deposited cloud water at a point corresponding to the MCCP field station are within the ranges actually observed. Sensitivity studies indicate that in-cloud oxidation of SO/sub 2/ makes a limited contribution to total sulfate deposition for typical concentrations of SO/sub 2/, O/sub 3/, and H/sub 2/O/sub 2/. However, sulfate deposition predicted by MCCP PLUVIUS is extremely sensitive to the value selected for aerosol sulfate existing in the modeled air mass prior to cloud formation. Hydrogen ion deposition predicted by the model is strongly influenced by input values for gas-phase nitric acid and ammonia. 11 refs., 19 figs., 9 tabs.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 6247496
- Report Number(s):
- PNL-6292; ON: DE87013867
- Country of Publication:
- United States
- Language:
- English
Similar Records
Cloud acidity and acidic deposition in the lower troposphere and ozone depletion in the Antarctic stratosphere: Modeling and data analysis regarding the role of atmospheric aerosol
Data user's guide to the Mountain Cloud Chemistry Project
Related Subjects
ACID RAIN
CLOUDS
CHEMICAL REACTIONS
HYDROGEN PEROXIDE
DEPOSITION
NITRATES
OZONE
SULFATES
AIR POLLUTION
AMMONIUM COMPOUNDS
MATHEMATICAL MODELS
METEOROLOGY
NAPAP
NORTH CAROLINA
P CODES
PH VALUE
ATMOSPHERIC PRECIPITATIONS
COMPUTER CODES
FEDERAL REGION IV
HYDROGEN COMPOUNDS
NITROGEN COMPOUNDS
NORTH AMERICA
OXYGEN COMPOUNDS
PEROXIDES
POLLUTION
RAIN
SULFUR COMPOUNDS
USA
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)
520300 - Environment
Aquatic- Radioactive Materials Monitoring & Transport- (1989)