Tihomir Novakov
EETD
Lawrence Berkeley National Laboratory
MS-73
One Cyclotron Road
Berkeley, CA 94720
510-486-5319
510-486-4733
tnovakov@lbl.gov

Carbonaceous aerosols composed principally of black (BC) and organic carbon (OC) are a major constituent of pollution and natural aerosols. A prerequisite for assessing the role of carbonaceous matter in aerosol related processes is the knowledge of mass concentrations, the state of its condensed phase, and particle size distributions. Achieving this knowledge, however, is a non-trivial task because of the problems specific to this aerosol. We addresses the following major issues: (1) Pressure and temperature related changes of physical state of OC, and (2) changes in BC/OC ratios occurring during transport from source to receptor regions. Both of these processes determine the ambient concentrations of BC and OC, as well as their relationships to sources. The research employs investigations under both laboratory and field conditions.

Some further information can be found in the viewgraphs from a presentation at the Atmospheric Sciences Program Annual Meeting held in February 2001. Additional information can be found in the viewgraphs from a presentation at the Atmospheric Sciences Program Annual Meeting held in March 2002.