Contribution of terpenes to ozone formation and secondary organic aerosols in a subtropical forest impacted by urban pollution

Christian Mark Salvador; Charles C.K. Chou; Tse Tsung Ho; Chao Yang Tsai; Tsung Ming Tsao; Ming Jer Tsai; Ta Chen Su

doi:10.3390/atmos11111232

Contribution of terpenes to ozone formation and secondary organic aerosols in a subtropical forest impacted by urban pollution

Christian Mark Salvador, Charles C.K. Chou, Tse Tsung Ho, Chao Yang Tsai, Tsung Ming Tsao, Ming Jer Tsai, Ta Chen Su

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

The highly reactive nature of biogenic volatile organic compounds (BVOCs) impacts the biosphere by acting as a precursor of ozone and aerosols that influence air quality and climate. Here, we assess the influence of BVOCs and their oxidation products on ozone formation and to submicron secondary organic aerosol (SOA) mass in a subtropical forest. A high-resolution proton-transfer-reaction time-of-flight mass spectrometer (PTR-ToF-MS) was employed for the continuous measurement of VOCs. Isoprene, monoterpene, and sesquiterpene mixing ratios in the forest were 0.23, 0.22, and 0.03 ppb, respectively. The total ozone formation potential (OFP) of the terpenes was 12.8 μg m−3, which accounted for only 5.6% of the total OFP. Particle phase bound oxidation products were characterized using a thermal-desorption PTR-ToF-MS. Mass spectra analysis revealed the presence pinonaldehyde, pinonic, norpinonic, and pinic acid in both gas and particle phase. The overall daytime (nighttime) mixing ratio of the oxidized BVOCs in gas phases was 0.062(0.023) ppbv. On the other hand, the mean fraction of the four monoterpene oxidation products in condensed phase was estimated at 42%. Overall, the results of this study evidenced quantitatively the contribution of BVOCs to the total reactivity and SOA mass in the subtropical forest.

Original language	English
Article number	1232
Journal	Atmosphere
Volume	11
Issue number	11
DOIs	https://doi.org/10.3390/atmos11111232
State	Published - Nov 2020
Externally published	Yes

Funding

Acknowledgments: The authors gratefully acknowledge the logistic support from the Experimental Forest, National Taiwan University. Funding: This research was funded Academia Sinica and the Ministry of Science and Technology of Taiwan through grants 105-2111-M-001-005-MY3, 104-2119-M-001-010 and 103-2111-M-001-003.

Funders	Funder number
Experimental Forest
Academia Sinica
Ministry of Science and Technology, Taiwan	103-2111-M-001-003, 104-2119-M-001-010, 105-2111-M-001-005-MY3
National Taiwan University

Keywords

BVOCs
Ozone formation
SOA mass analysis
TD-PTR-ToF-MS

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.3390/atmos11111232

Cite this

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title = "Contribution of terpenes to ozone formation and secondary organic aerosols in a subtropical forest impacted by urban pollution",

abstract = "The highly reactive nature of biogenic volatile organic compounds (BVOCs) impacts the biosphere by acting as a precursor of ozone and aerosols that influence air quality and climate. Here, we assess the influence of BVOCs and their oxidation products on ozone formation and to submicron secondary organic aerosol (SOA) mass in a subtropical forest. A high-resolution proton-transfer-reaction time-of-flight mass spectrometer (PTR-ToF-MS) was employed for the continuous measurement of VOCs. Isoprene, monoterpene, and sesquiterpene mixing ratios in the forest were 0.23, 0.22, and 0.03 ppb, respectively. The total ozone formation potential (OFP) of the terpenes was 12.8 μg m−3, which accounted for only 5.6% of the total OFP. Particle phase bound oxidation products were characterized using a thermal-desorption PTR-ToF-MS. Mass spectra analysis revealed the presence pinonaldehyde, pinonic, norpinonic, and pinic acid in both gas and particle phase. The overall daytime (nighttime) mixing ratio of the oxidized BVOCs in gas phases was 0.062(0.023) ppbv. On the other hand, the mean fraction of the four monoterpene oxidation products in condensed phase was estimated at 42%. Overall, the results of this study evidenced quantitatively the contribution of BVOCs to the total reactivity and SOA mass in the subtropical forest.",

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author = "Salvador, {Christian Mark} and Chou, {Charles C.K.} and Ho, {Tse Tsung} and Tsai, {Chao Yang} and Tsao, {Tsung Ming} and Tsai, {Ming Jer} and Su, {Ta Chen}",

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AU - Salvador, Christian Mark

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AU - Tsao, Tsung Ming

AU - Tsai, Ming Jer

AU - Su, Ta Chen

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N2 - The highly reactive nature of biogenic volatile organic compounds (BVOCs) impacts the biosphere by acting as a precursor of ozone and aerosols that influence air quality and climate. Here, we assess the influence of BVOCs and their oxidation products on ozone formation and to submicron secondary organic aerosol (SOA) mass in a subtropical forest. A high-resolution proton-transfer-reaction time-of-flight mass spectrometer (PTR-ToF-MS) was employed for the continuous measurement of VOCs. Isoprene, monoterpene, and sesquiterpene mixing ratios in the forest were 0.23, 0.22, and 0.03 ppb, respectively. The total ozone formation potential (OFP) of the terpenes was 12.8 μg m−3, which accounted for only 5.6% of the total OFP. Particle phase bound oxidation products were characterized using a thermal-desorption PTR-ToF-MS. Mass spectra analysis revealed the presence pinonaldehyde, pinonic, norpinonic, and pinic acid in both gas and particle phase. The overall daytime (nighttime) mixing ratio of the oxidized BVOCs in gas phases was 0.062(0.023) ppbv. On the other hand, the mean fraction of the four monoterpene oxidation products in condensed phase was estimated at 42%. Overall, the results of this study evidenced quantitatively the contribution of BVOCs to the total reactivity and SOA mass in the subtropical forest.

AB - The highly reactive nature of biogenic volatile organic compounds (BVOCs) impacts the biosphere by acting as a precursor of ozone and aerosols that influence air quality and climate. Here, we assess the influence of BVOCs and their oxidation products on ozone formation and to submicron secondary organic aerosol (SOA) mass in a subtropical forest. A high-resolution proton-transfer-reaction time-of-flight mass spectrometer (PTR-ToF-MS) was employed for the continuous measurement of VOCs. Isoprene, monoterpene, and sesquiterpene mixing ratios in the forest were 0.23, 0.22, and 0.03 ppb, respectively. The total ozone formation potential (OFP) of the terpenes was 12.8 μg m−3, which accounted for only 5.6% of the total OFP. Particle phase bound oxidation products were characterized using a thermal-desorption PTR-ToF-MS. Mass spectra analysis revealed the presence pinonaldehyde, pinonic, norpinonic, and pinic acid in both gas and particle phase. The overall daytime (nighttime) mixing ratio of the oxidized BVOCs in gas phases was 0.062(0.023) ppbv. On the other hand, the mean fraction of the four monoterpene oxidation products in condensed phase was estimated at 42%. Overall, the results of this study evidenced quantitatively the contribution of BVOCs to the total reactivity and SOA mass in the subtropical forest.

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Contribution of terpenes to ozone formation and secondary organic aerosols in a subtropical forest impacted by urban pollution

Abstract

Funding

Keywords

UN SDGs

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