Diurnal Variation And Vertical Distribution
Of Carbonaceous Aerosols In The Southern Part
Of Thailand
Author(s)
S. Pongpiachan, S. Pongnailert, K. F. Ho & J. Cao
Abstract
Carbonaceous compositions, water-soluble ionic species and trace gaseous
species were identified and quantified in Hat-Yai city, Thailand. All samples
were collected every three hours consecutively from 21:00 h December 17th to
21:00 h December 20th at Site 1 (30 m agl), Site 2 (60 m agl) and Site 3
(125 m agl). The averaged concentration of OC was significantly higher at Site 1
than those detected at Site 2 and Site 3 suggesting that anthropogenic activities at
ground level might play a major role in governing air quality at ground level.
The main objective of this study is to investigate the vertical distribution of
carbonaceous aerosols in Hat-Yai’s atmosphere for the first time by using
IMPROVE TOC (Interagency Monitoring to Protect Visual Environments Total
Organic Carbon) protocol. The morning peak of carbonaceous compositions
observed during the sampling period of 06:00–09:00 emphasized the main
contribution of traffic emissions on OC/EC contents in Hat-Yai city. In this
study, we found that aged maritime aerosols from long-range transportation
and/or biomass burning particles overwhelmed carbonaceous aerosols at the top
of building. Whilst hierarchical cluster analysis and Pearson correlation analysis
show some considerable influences of night-time tourism activities on
carbonaceous contents at ground level, principal component analysis highlights
the impacts of maritime aerosols, biomass burning and possibly agricultural
waster burning particles at a higher atmospheric layer.
Keywords
carbonaceous aerosols, vertical distribution, tropical climate,
principal component analysis, hierarchical cluster analysis.
Related Book
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