Influence of tropical weather and northeasterly air mass on carbonaceous aerosol in the Southern Malay Peninsula

Suradi, Hamidah and Khan, Md F. and Alias, Nor F. and Shah, Syazwani Mustapa Kama and Yusoff, Sumiani and Fujii, Yusuke and Othman, Murnira and Latif, Mohd T. (2021) Influence of tropical weather and northeasterly air mass on carbonaceous aerosol in the Southern Malay Peninsula. ACS Earth and Space Chemistry, 5 (3). pp. 553-565. ISSN 2472-3452, DOI

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Carbonaceous aerosols play a key role in climate modification and exert a deleterious effect on human health. Thus, this study aimed to determine the thermally derived carbonaceous fraction in particulate matter (PM)(2.5) from the Southern Malay Peninsula, a tropical area in Malaysia, during January 2019 to March 2019. PM2.5 was captured on quartz filters using a high-volume sampler on a 24 h basis. Eight of the carbon fractions were measured using the thermal optical reflectance method. Carbonaceous aerosol was thoroughly characterized by estimating elemental carbon (EC), organic carbon (OC), total carbon, secondary OC, soot-EC, and char-EC to determine the mechanism of emission from fossil fuel combustion, biomass, and secondary origins. The effect of local meteorological factors and air mass transport on the change in the light-absorbing aerosol fraction was also examined. Secondary organic sources and primary sources emitted 46 and 54% of OC, respectively. The estimated char-EC in this study was 10-fold higher than soot-EC, indicating that biomass burning and coal combustion were the predominant routes of EC emission, whereas petrol or diesel engines were the less predominant generators of soot-EC. Trajectory modeling showed that biomass fires in the Indochina region were the potential origin of carbonaceous aerosols transported from the northeasterly direction.

Item Type: Article
Funders: Fundamental Research Grant Scheme (FRGS) from the Ministry of Higher Education (MOHE), Malaysia [Grant No: FP099-2019A]
Uncontrolled Keywords: Thermally derived light-absorbing aerosol; PM2.5; Northeasterly monsoon; Elemental carbon; Backward trajectory
Subjects: G Geography. Anthropology. Recreation > G Geography (General)
Q Science > QD Chemistry
Divisions: Faculty of Science
Deputy Vice Chancellor (Research & Innovation) Office > Institute of Ocean and Earth Sciences
Depositing User: Ms Zaharah Ramly
Date Deposited: 20 Jun 2022 08:28
Last Modified: 20 Jun 2022 08:28

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