Daytime-nighttime variations in the concentration of PM0.1 carbonaceous particles during a biomass fire episode in Chiang Mai, Thailand--颗粒学报PARTICUOLOGY

Phairuang, W., Chetiyanukornkul, T., Suriyawong, P., Ho, S., Paluang, P., Furuuchi, M., . . . Hata, M. (2024). Daytime-nighttime variations in the concentration of PM0.1 carbonaceous particles during a biomass fire episode in Chiang Mai, Thailand. Particuology, 87, 316-324. https://doi.org/10.1016/j.partic.2023.09.013

Daytime-nighttime variations in the concentration of PM0.1 carbonaceous particles during a biomass fire episode in Chiang Mai, Thailand

Worradorn Phairuang ^{a b *}, Thaneeya Chetiyanukornkul ^c, Phuchiwan Suriyawong ^d, Sotasing Ho ^e, Phakphum Paluang ^b, Masami Furuuchi ^a, Muhammand Amin ^{a f}, Mitsuhiko Hata ^a

a Faculty of Geosciences and Civil Engineering, Institute of Science and Engineering, Kanazawa University, Kanazawa, Ishikawa, 920-1192, Japan
b Department of Geography, Faculty of Social Sciences, Chiang Mai University, Muang, Chiang Mai 50200, Thailand
c Department of Biology, Faculty of Science, Chiang Mai University, Muang, Chiang Mai, 50200, Thailand
d Research Unit for Energy Economics and Ecological Management, Multidisciplinary Research Institute, Chiang Mai University, Chiang Mai, 50200, Thailand
e Management and Development Training Program Office, National Institute of Science, Technology and Innovation, 120601, Cambodia
f Faculty of Engineering, Maritim University of Raja Ali Haji, Tanjung Pinang, Kepulauan Riau, 29115, Indonesia

10.1016/j.partic.2023.09.013

Volume 87, April 2024, Pages 316-324

Received 28 July 2023, Revised 12 September 2023, Accepted 24 September 2023, Available online 4 October 2023, Version of Record 4 November 2023.

E-mail: worradorn@gmail.com; pworradorn@se.kanazawa-u.ac.jp

Highlights

• Diurnal variations of PM_0.1 particles were studied in detail in Chiang Mai, Thailand.

• PM_0.1 carbon profiles were found to differ during daytime and nighttime periods.

• In the eight carbon profiles, OC3 was predicted to be a marker of biomass fires.

• Increased secondary OC/OC contributed significantly to the PM_0.1 particles.

Abstract

Carbonaceous aerosols affect air quality adversely, affect global warming, and human health. However, our understanding of the impact of ultrafine (PM_0.1) carbonaceous particulate matter is incomplete, particularly the effects during haze episodes. This study monitored diurnal variations in PM_0.1 in Chiang Mai, Thailand, from March to April 2020. We investigated carbonaceous PM_0.1 collected by an ambient nano-sampler and evaluated their effect by using a carbon analyzer (IMPROVE_TOR). The results showed that burning large open areas in the dry season was crucial for increasing the particle mass concentration because of the large open burnings that occurred in this area. The majority of biomass fires near the sampling site occurred during the night, which would allow more particles to be released thus resulting in higher concentrations of PM_0.1. Hence, the release of PM_0.1 during the night would obviously result in higher concentrations than that during the day. In the eight carbon profiles, organic carbon 3 (OC3) was predicted to be a marker of biomass fires. The carbon indices displayed that PM0.1 was influenced by biomass burning both daytime and nighttime. The findings reported herein should be of great importance in terms of establishing biomass burning control policies for mitigating heavy haze pollution in Thailand and elsewhere.

Graphical abstract

Keywords

Biomass burning; Carbon; Forest fires; Nanoparticles; Ultrafine particles

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