Dependence of nephelometer scattering coefficients on relative humidity: fronts, nocturnal disturbance, and wood smoke
The dependence of the nephelometer scattering coefficient of atmospheric air on the relative humidity at the RTP is discussed for four different meteorological examples. These examples feature (1) the passage of a low pressure system with thunderstorms, (2) the passage of a cold, dry front, (3) a nocturnal weather disturbance due to an unknown source, and (4) wood smoke aerosols from burning tree piles. Nephelometer scattering coefficient data were obtained by the use of two nephelometers. One nephelometer was operated at the ambient outside relative humidity and the other nephelometer at a different relative humidity. Using this operational mode of data acquisition, qualitative temporal information was deduced on the variations of aerosol size and number density as various meteorological parameters vary. The temporal trend of the visibility is also discussed for each example.
- Research Organization:
- Environmental Protection Agency, Research Triangle Park, NC (USA). Environmental Sciences Research Lab.
- OSTI ID:
- 5107218
- Report Number(s):
- PB-82-188913; EPA-600/3-82-006
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AIR POLLUTION MONITORS
PERFORMANCE
SMOKES
ENVIRONMENTAL EFFECTS
AEROSOLS
AIR POLLUTION
COMBUSTION PRODUCTS
DATA ACQUISITION
DENSITY
HUMIDITY
VISIBILITY
WOOD
COLLOIDS
DISPERSIONS
MEASURING INSTRUMENTS
MONITORS
PHYSICAL PROPERTIES
POLLUTION
RESIDUES
SOLS
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)