The ATOFMS source apportionment method utilizes a library of distinct source mass spectral signatures to match the chemical information of the single ambient particles. The unique signatures are obtained in controlled source characterization studies, such as with the exhaust emissions of heavy duty diesel vehicles (HDDV) operating on a dynamometer. The apportionment of ambient aerosols is complicated by the chemical and physical processes an individual particle can undergo as it spends time in the atmosphere, which is referred to as qagingq of the aerosol. Therefore, the performance of the source signature library technique was investigated on the ambient dataset of the highly aged environment of Riverside, California. Additionally, two specific subsets of the Riverside dataset (ultrafine particles and particles containing trace metals), which are known to cause adverse health effects, were probed in greater detail. Finally, the impact of large wildfires on the ambient levels of particulate matter in Southern California is discussed.... of radiative forcing in climate change (a) and schematic diagram of the various radiative mechanisms in which aerosols ... The representative data taken from the SMPS [a a open circles] and the APS [ai a solid squares] show a difference inanbsp;...
|Title||:||Single Particle Characterization, Source Apportionment, and Aging Effects of Ambient Aerosols in Southern California|
|Author||:||Laura Grace Shields|
|Publisher||:||ProQuest - 2008|