Research Projects

Project at a Glance

Project Status: complete

Report Published January 1989:

Title: Transport of atmospheric aerosols above the Sierra Nevada slopes

Principal Investigator / Author(s): Myrup, L O

Contractor: UC Davis

Contract Number: A4-127-32


Research Program Area: Atmospheric Processes

Topic Areas: Acid Deposition, Transport


Abstract:

The general objective of this program was to document the boundary-layer transport of aerosol pollution into Sequoia National Park. To accomplish this, four measurement programs were carried out: (1) Tethersonde profiles of temperature, humidity, and wind velocity, (2) tethered balloon measurements of aerosol concentrations, (3) Pibal wind measurements at three sites in the park and (4) measurement of surface meteorological parameters at the pibal wind sites. These data were collected during July and August 1985 at Emerald Lake, Wolverton Meadow, and Ash Mountain. The following conclusions are drawn from the data: 1) When averaged over the entire concentration period, the concentration of all fine elements reported is higher in upslope conditions than in other conditions; 2) the fluxes of most elements also exhibit similar behavior; 3) the concentration of certain coarse elements shows a strong tendency to increase upward in the lower 200 m during the nighttime hours; 4) the potential for "smog front" phenomena seems to exist in the lower regions of the park, due to convergence in the meso-scale wind field, 5) The upslope / downslope boundary-layer, meso-scale, and large-scale winds seem to interact in a complex fashion to produce the observed transport.


 

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