HR: 0800h
AN: A51B-0347    [Abstracts]
TI: AEROSOL GENERATION AND CIRCULATION IN THE SHORE ZONE OF A LARGE ALPINE LAKE - LAKE TAHOE, CA.
AU: * VanCuren, R A
EM: rvancure@arb.ca.gov
AF: Research Division, California Air Resources Board, 1001 I St., Sacramento, CA 95812, United States
AU: Pederson, J R
EM: jrpeders@arb.ca.gov
AF: Research Division, California Air Resources Board, 1001 I St., Sacramento, CA 95812, United States
AU: Lashgari, A
EM: klashgar@arb.ca.gov
AF: Research Division, California Air Resources Board, 1001 I St., Sacramento, CA 95812, United States
AU: Dolislager, L
EM: ldolisla@arb.ca.gov
AF: Research Division, California Air Resources Board, 1001 I St., Sacramento, CA 95812, United States
AU: McCauley, E
EM: emccaule@arb.ca.gov
AF: Research Division, California Air Resources Board, 1001 I St., Sacramento, CA 95812, United States
AB: The temporal, spatial, and size-distribution patterns of particles in ambient air over shore areas and the surface of Lake Tahoe (Nevada and California) were studied as part of the 2003-2004 Lake Tahoe Atmospheric Deposition Study (LTADS). The concentration of population along the shoreline of Lake Tahoe makes accurate characterization of local aerosol generation and transport especially important in estimation of annual particle flux onto the surface of the lake. Road dust and smoke are major components of aerosols around the lake, and strong gradients in concentrations and size distributions occur as functions of location, land use, traffic activity, and time of day. Measurements taken while cruising on the lake show that aerosol concentrations in near-shore areas are primarily controlled by a combination of diurnal cycling of land- and lake- breezes coupled with varying particle emissions driven by cycles of human activity. Source-associated particle size distributions were shown to be conserved over wide ranges of particle concentrations. Particle concentrations over water were shown to be highly localized, with highest concentrations just offshore from urbanized areas, lowest concentrations along undeveloped shoreline, and low-to-intermediate concentrations over the middle areas of the lake. Based in part on these observations, particle deposition to the lake is seen to be dominated by mesoscale processes, with only minor contributions from regional or large scale atmospheric circulation.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0394 Instruments and techniques
DE: 3307 Boundary layer processes
DE: 3322 Land/atmosphere interactions (1218, 1631, 1843)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting