Analysis of the data from the three-dimensional gradient study. Final report Jul--Sep 73

Technical Report · Thu Jan 01 04:00:00 EST 1976

OSTI ID:7305106

Smith, T B; Marsh, S L; White, W H; Jerskey, T N; Lamb, R G

Pollutant layers aloft were found to result from a variety of mechanisms including heating of mountain slopes, convergence zones and plumes from stationary sources. Aged pollutants tend to accumulate aloft along the foothill areas during the late afternoon. Under stagnant wind conditions, these layers of ozone and other products of photochemical reactions may remain in the area and can contribute to high surface ozone concentrations along the foothills on the following day. Examination of the effect of aerosols on the redistribution of ultraviolet radiation in the air column indicated that light scattering can cause the photodissociation rate constants aloft to be 30 to 40 percent higher than they are at the ground. The analysis of the diffusive properties of the mixed layer showed that at any hour (of a clear day) the mixing depth in the basin is related to the friction velocity. The average time required for pollutants to become thoroughly mixed through the depth of the marine layer is about ten minutes. (GRA)

• Research Organization: Meteorology Research, Inc., Altadena, CA (USA)
• OSTI ID: 7305106
• Report Number(s): PB-253936; MR-175-FR-1395
• Country of Publication: United States
• Language: English

Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AEROSOLS
AIR POLLUTION
CALIFORNIA
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
COLLOIDS
COMBUSTION PRODUCTS
DECOMPOSITION
DIFFUSION
DISPERSIONS
DISSOCIATION
EARTH ATMOSPHERE
LIGHT SCATTERING
METEOROLOGY
MIXING
NITROGEN COMPOUNDS
NITROGEN OXIDES
NORTH AMERICA
OXIDES
OXYGEN COMPOUNDS
OZONE
PHOTOCHEMICAL REACTIONS
PHOTOCHEMISTRY
PHOTOLYSIS
POLLUTION
RADIATIONS
SMOG
SOLAR RADIATION
SOLS
TURBULENCE
USA
WESTERN REGION
WIND