Yosemite Aerosol Characterization Study

Background

The Yosemite Aerosol Characterization Study (YACS) was an intensive field measurement campaign conducted by a number of U.S. research groups from 15 July to 4 September 2002 at Yosemite National Park (NP), California. The objectives of the study were to:

1) Determine appropriate values for converting analyzed aerosol carbon mass to ambient aerosol organic carbon mass.

2) Develop an improved understanding of the visibility-impairment-related characteristics of a smoke/organic carbon-dominated aerosol, including the role of relative humidity in modifying visibility impairment.

3) Examine the sources contributing to high aerosol organic carbon mass concentrations.

Reports

Final Report: The Yosemite Aerosol Characterization Study of 2002

Publications

Carrico, C.M., S.M. Kreidenweis, W.C. Malm, D.E. Day, T. Lee, J. Carrillo, G.R. McMeeking, and J.L. Collett Jr., Hygroscopic growth behavior of a carbon-dominated aerosol in Yosemite National Park, Atmos. Environ., 39, 1393-1404, 2005.

Engling, G., P. Herckes, S.M. Kreidenweis, W.C. Malm, and J.L. Collett Jr., Composition of the fine organic aerosol in Yosemite National Park during the 2002 Yosemite Aerosol Characterization Study, Atmos. Environ, 40, 2959-2972, 2006.

Hand, J.L., W.C. Malm, D. Day, T. Lee, C. Carrico, J. Carrillo, J.L. Collett Jr., A. Laskin, C. Wang, J.P. Cowin, and M.J. Iedema, Optical, physical and chemical properties of tar balls observed during the Yosemite Aerosol Characterization Study, J. Geophys. Res., 110, doi:10.1029/204JD005728, 2005.

Malm, W.C., D.E. Day, C.M. Carrico, S.M. Kreidenweis, J. J.L. Collett Jr., G. McMeeking, T. Lee, J. Carrillo, and B.A. Schichtel, Inter-comparison and closure calculations using measurements of aerosol species and optical properties during the Yosemite Aerosol Characterization Study, J. Geophys. Res., 110, doi:10.1029/2004JD005494, 2005.

Malm, W.C., D.E. Day, S.M. Kreidenweis, J.L. Collett Jr., C.M. Carrico, G. McMeeking, and T. Lee, Hygroscopic growth properties of an organic-laden aerosol, Atmos. Environ., 39, 4969-4982, 2005.

McMeeking, G.R., S.M. Kreidenweis, C.M. Carrico, T. Lee, J.L. Collett Jr., and W.C. Malm, Observations of smoke influenced aerosol during the Yosemite Aerosol Characterization Study: Size distributions and chemical composition,J. Geophys. Res., 110, doi:10.1029/2004JD005389, 2005.

McMeeking, G.R., S.M. Kreidenweis, C.M. Carrico, J.L. Collett Jr., D.E. Day, and W.C. Malm, Observations of smoke influenced aerosol during the Yosemite Aerosol Characterization Study: 2. Aerosol scattering and absorbing properties, J. Geophys. Res., 110, doi:10.1029/2004JD005624, 2005.

McMeeking, G.R., S.M. Kreidenweis, M. Lunden, J. Carrillo, C.M., Carrico, T. Lee, P. Herckes, G. Engling, D.E. Day, J.L. Hand, N. Brown, W.C. Malm, and J.L. Collett Jr., Smoke-impacted regional haze in California during the summer of 2002. Agricultural and Forest Meteorology, 1-2,  25-42, 2006.