Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2017-931
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
13 Nov 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).
Seasonal variation and chemical characterization of PM2.5 in northwestern Philippines
Gerry Bagtasa1, Mylene G. Cayetano1, and Chung-Shin Yuan2 1Institute of Environmental Science & Meteorology, University of the Philippines, Diliman, Quezon City, Philippines
2Institute of Environmental Engineering, National Sun-Yat Sen University, Kaoshiung, Taiwan
Abstract. The seasonal and chemical characteristic of fine particulate matter (PM2.5) was investigated in Burgos, Ilocos Norte, located at the northwestern edge of the Philippines. Each 24H-sample of fine aerosol was collected for two weeks every season. Fine particulate in the region shows strong seasonal variation in both concentration and composition. Highest mass concentration was seen during the boreal spring season with a mean mass concentration of 21.59 μg m-3, and lowest was in fall with a mean concentration of 8.44 μg m-3. Three-day wind back trajectory analysis of air mass reveals the influence of the North Western Pacific monsoon regimes on PM2.5 concentration. During southwest monsoon, sea salt is the dominant component of fine aerosols carried by moist air from the South China Sea. During northeast monsoon, on the other hand, both wind and receptor model (USEPA PMF) analysis showed that higher particulate concentration was due to the Long Range Transport (LRT) of anthropogenic emissions from the northern East Asia. Overall, sea salt and soil comprise 33 % of total PM2.5 concentration while local biomass burning makes up 33 %. LRT of industrial emission, solid waste burning and secondary sulfate from East Asia have a mean contribution of 34 % to the total fine particulate for the whole sampling period.

Citation: Bagtasa, G., Cayetano, M. G., and Yuan, C.-S.: Seasonal variation and chemical characterization of PM2.5 in northwestern Philippines, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-931, in review, 2017.
Gerry Bagtasa et al.
Gerry Bagtasa et al.
Gerry Bagtasa et al.

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Short summary
Monsoon seasons are known to affect weather and climate in the Philippines. These winds also cause the movement of pollutants in Asia. In this study, we found that during the northeast monsoon, pollution emissions from northern East Asia reaches the northern Philippines. On average, these transported pollutants make up a third of observed pollutants in the region.
Monsoon seasons are known to affect weather and climate in the Philippines. These winds also...
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