Effects of relative humidity gradients on the evaluation of submicron aerosol flux measurements in the atmospheric surface layer
This study investigates the influence of humidity gradients on submicron particle fluxes and the resulting deposition velocities estimated from a micrometeorological, aerodynamic technique. The effects of relative humidity causing condensational growth and evaporative shrinkage of submicron particles and then significantly altering deposition velocities, estimated by applying an aerodynamic computational scheme to values of particle concentrations measured at heights of 1.0 and 8.5 m above a grass surface, appear negligible when relative humidities at the measurement heights are less than 98%. Also, the effects of surface wetness to increase the deposition velocities appear insignificant. Deposition velocities for the larger size cut are rarely significantly different from zero. The very fine particles have deposition velocities that are positive most of the time, and peak during the afternoon. 12 refs., 3 tabs.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 5865016
- Report Number(s):
- CONF-850406-4; ON: DE85010510
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AERODYNAMICS
AEROSOLS
BOUNDARY LAYERS
COLLOIDS
DATA
DEPOSITION
DISPERSIONS
EARTH ATMOSPHERE
ENVIRONMENTAL IMPACTS
EXPERIMENTAL DATA
FLUID MECHANICS
GRASS
HUMIDITY
INFORMATION
LAYERS
MATHEMATICAL MODELS
MECHANICS
NUMERICAL DATA
PLANTS
SOLS
VELOCITY