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Yin-Nan Lee Brookhaven National Laboratory Atmospheric Sciences Division Bldg. 815E, 75 Rutherford Drive Upton, NY 11973-5000 Tel: 631-344-3294 Fax: 631-344-2887 email: ynlee@bnl.gov A better understanding of organic aerosol regarding sources, formation, and properties is needed to improve the ability to predict atmospheric distributions of aerosol particles and to assess their radiative effects. A rapid on-line technique coupling a particle-into-liquid sampler (PILS) and a total organic carbon (TOC) detector for measuring the TOC and water-soluble organic carbon (WSOC) in aerosol particles at a time resolution of better than three minutes suitable for aircraft measurement will be developed. Using the fast data obtained, the rates of secondary organic aerosol formation in environments of different emission characteristics will be determined and compared with photochemical model predictions for mechanistic insights. The contributions of TOC and WSOC to the simultaneously determined aerosol properties, including hygroscopicity, light scattering, and cloud condensation nuclei (CCN) formation will also be investigated. In addition, the so-called humic-like substances (HULIS), which account for an appreciable fraction of WSOC, will be characterized to gain an understanding of their sources and effects. Keywords: chemical composition, secondary organic aerosol, total organic carbon, water soluble organic carbon, radiative effects [back to ASP ST Membership] |