Estimation Of Aerosol Particle Density, Dynamic Shape Factor And Mass Concentration During The Metro Manila Air Quality Characterization Experiment (MACE) 2015 | 48338
Journal of Earth Science & Climatic Change
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One of the important properties of atmospheric aerosol particles is its density and its morphology. During the Metro Manila Air
Quality Characterization Experiment in summer 2015 (MACE 2015), characterization of aerosol particle physical-chemical
properties was conducted over the selected sites of Metro Manila. The focus of this study was the particle density and dynamic
shape factor. An inversion algorithm for the particle number size distribution in terms of the volume equivalent diameter was
used to combine measurements of a mobility and an aerodynamic particle size spectrometer. The merging algorithm was used to
derive particle density and dynamic shape factor. This methodology was used to calculate effective densities from both roadside and
background sites. The average derived particle density in the roadsides varied from 1.3 g/cm3 to 1.4 g/cm3 while at the background site
it was approximately 1.6 g/cm3. In general, the derived dynamic shape factor at the roadside was higher compared to the background
site. This suggests that, at the roadside, the dominant aerosol particles are soot agglomerates. At the background environment,
particles are a mixture of freshly emitted and aged particles, as well as of secondary particle material. The estimated effective density
in the two roadsides was between 1.04 g/cm3 and 0.82 g/cm3 which is lower compared to the background site with a value of 1.25 g/
cm3. This agreed well with previous studies, which showed that the effective density decreases with increasing agglomeration of soot
particles. Estimated aerosol particle mass concentration, derived from merged SMPS and APS number size distribution was found to
be higher than that measured with a gravimetric method during most of the sampling days. Reasons for this difference are discussed
cursorily. These results will be used for mass closure at urban background and roadside sites.
G A Catipay is a Master of Science in Atmospheric Science in Ateneo de Manila University. She completed her Bachelor’s degree in Physics at Mindanao State University.