Staff View: Trans-boundary air pollution in a Southeast Asian megacity: Case studies of the synoptic meteorological mechanisms and impacts on air quality

Trans-boundary air pollution in a Southeast Asian megacity: Case studies of the synoptic meteorological mechanisms and impacts on air quality

Local and regional sources contribute to degraded air quality in many urban areas, however, the influence of trans-boundary air pollution on surface PM2.5 is still poorly characterized in Southeast Asia (SEA) megacities. This study, for the first time, utilizes multi-platform datasets to elucidate t...

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Main Authors:	Nguyen, Ly Sy Phu, Chang, Jackson Hian Wui, Stephen M. Griffith, Hien, To Thi, Kong, Steven Soon-Kai, Le, Hoai Nam, Huang, Hsiang-Yu, Sheu, Guey-Rong, Lin, Neng-Huei
Format:	Article
Language:	English English
Published:	Elsevier B.V. 2022
Subjects:	Q1-390 Science (General) QH1-(199.5) General Including nature conservation, geographical distribution TD878-894 Special types of environment Including soil pollution, air pollution, noise pollution
Online Access:	https://eprints.ums.edu.my/id/eprint/32643/1/Trans-boundary%20air%20pollution%20in%20a%20Southeast%20Asian%20megacity.pdf https://eprints.ums.edu.my/id/eprint/32643/2/Trans-boundary%20air%20pollution%20in%20a%20Southeast%20Asian%20megacity1.pdf https://eprints.ums.edu.my/id/eprint/32643/ https://www.sciencedirect.com/science/article/pii/S1309104222000526?casa_token=EyIRUq4JyxEAAAAA:uHzmSOhOU-m9jq5pRJSVm5AMHje0EA6wesX55EkcxPshcstaWjvJsjN48S4WMFKLfU8j7M_rxKk https://doi.org/10.1016/j.apr.2022.101366
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spelling	my.ums.eprints.326432022-05-20T00:46:52Z https://eprints.ums.edu.my/id/eprint/32643/ Trans-boundary air pollution in a Southeast Asian megacity: Case studies of the synoptic meteorological mechanisms and impacts on air quality Nguyen, Ly Sy Phu Chang, Jackson Hian Wui Stephen M. Griffith Hien, To Thi Kong, Steven Soon-Kai Le, Hoai Nam Huang, Hsiang-Yu Sheu, Guey-Rong Lin, Neng-Huei Q1-390 Science (General) QH1-(199.5) General Including nature conservation, geographical distribution TD878-894 Special types of environment Including soil pollution, air pollution, noise pollution Local and regional sources contribute to degraded air quality in many urban areas, however, the influence of trans-boundary air pollution on surface PM2.5 is still poorly characterized in Southeast Asia (SEA) megacities. This study, for the first time, utilizes multi-platform datasets to elucidate two trans-boundary PM2.5 episodes in Ho Chi Minh City (HCMC), Vietnam, over the periods 25–29 Oct 2013 and 05–08 Oct 2015. Both events persisted with limited diurnal fluctuations and more than 60% of the Air Quality Index (AQI) values at an unhealthy level. PM2.5 concentrations during the events were 100% and 115% higher on average compared to local accumulation periods in the same months, highlighting the importance of trans-boundary pollution to local HCMC air quality. Backward trajectories, MERRA-2 AOD data, and CALIPSO images revealed the origin and synoptic meteorology conditions facilitating both trans-boundary pollution events. Anthropogenic PM2.5 emissions in continental East Asia fed the 2013 event, which was then transported by strong northeasterly winds triggered by an upper-level ridge near the Tibetan Plateau and a low-pressure system in western Pacific Ocean. In contrast, the 2015 event was the result of Indonesia biomass burning (BB), which was enhanced and transported by a westward propagating Western Pacific Subtropical High triggered by a strong El Nino ˜ event. Future climate change will likely increase the number of extreme El Nino ˜ events, leading to the increase of transboundary Indonesia BB events to HCMC. This study lays the groundwork for detailing the impact of trans-boundary pollution on local air quality in SEA megacities. Elsevier B.V. 2022 Article PeerReviewed text en https://eprints.ums.edu.my/id/eprint/32643/1/Trans-boundary%20air%20pollution%20in%20a%20Southeast%20Asian%20megacity.pdf text en https://eprints.ums.edu.my/id/eprint/32643/2/Trans-boundary%20air%20pollution%20in%20a%20Southeast%20Asian%20megacity1.pdf Nguyen, Ly Sy Phu and Chang, Jackson Hian Wui and Stephen M. Griffith and Hien, To Thi and Kong, Steven Soon-Kai and Le, Hoai Nam and Huang, Hsiang-Yu and Sheu, Guey-Rong and Lin, Neng-Huei (2022) Trans-boundary air pollution in a Southeast Asian megacity: Case studies of the synoptic meteorological mechanisms and impacts on air quality. Atmospheric Pollution Research, 13 (101366). pp. 1-14. ISSN 1309-1042 https://www.sciencedirect.com/science/article/pii/S1309104222000526?casa_token=EyIRUq4JyxEAAAAA:uHzmSOhOU-m9jq5pRJSVm5AMHje0EA6wesX55EkcxPshcstaWjvJsjN48S4WMFKLfU8j7M_rxKk https://doi.org/10.1016/j.apr.2022.101366
institution	Universiti Malaysia Sabah
building	UMS Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Malaysia Sabah
content_source	UMS Institutional Repository
url_provider	http://eprints.ums.edu.my/
language	English English
topic	Q1-390 Science (General) QH1-(199.5) General Including nature conservation, geographical distribution TD878-894 Special types of environment Including soil pollution, air pollution, noise pollution
spellingShingle	Q1-390 Science (General) QH1-(199.5) General Including nature conservation, geographical distribution TD878-894 Special types of environment Including soil pollution, air pollution, noise pollution Nguyen, Ly Sy Phu Chang, Jackson Hian Wui Stephen M. Griffith Hien, To Thi Kong, Steven Soon-Kai Le, Hoai Nam Huang, Hsiang-Yu Sheu, Guey-Rong Lin, Neng-Huei Trans-boundary air pollution in a Southeast Asian megacity: Case studies of the synoptic meteorological mechanisms and impacts on air quality
description	Local and regional sources contribute to degraded air quality in many urban areas, however, the influence of trans-boundary air pollution on surface PM2.5 is still poorly characterized in Southeast Asia (SEA) megacities. This study, for the first time, utilizes multi-platform datasets to elucidate two trans-boundary PM2.5 episodes in Ho Chi Minh City (HCMC), Vietnam, over the periods 25–29 Oct 2013 and 05–08 Oct 2015. Both events persisted with limited diurnal fluctuations and more than 60% of the Air Quality Index (AQI) values at an unhealthy level. PM2.5 concentrations during the events were 100% and 115% higher on average compared to local accumulation periods in the same months, highlighting the importance of trans-boundary pollution to local HCMC air quality. Backward trajectories, MERRA-2 AOD data, and CALIPSO images revealed the origin and synoptic meteorology conditions facilitating both trans-boundary pollution events. Anthropogenic PM2.5 emissions in continental East Asia fed the 2013 event, which was then transported by strong northeasterly winds triggered by an upper-level ridge near the Tibetan Plateau and a low-pressure system in western Pacific Ocean. In contrast, the 2015 event was the result of Indonesia biomass burning (BB), which was enhanced and transported by a westward propagating Western Pacific Subtropical High triggered by a strong El Nino ˜ event. Future climate change will likely increase the number of extreme El Nino ˜ events, leading to the increase of transboundary Indonesia BB events to HCMC. This study lays the groundwork for detailing the impact of trans-boundary pollution on local air quality in SEA megacities.
format	Article
author	Nguyen, Ly Sy Phu Chang, Jackson Hian Wui Stephen M. Griffith Hien, To Thi Kong, Steven Soon-Kai Le, Hoai Nam Huang, Hsiang-Yu Sheu, Guey-Rong Lin, Neng-Huei
author_facet	Nguyen, Ly Sy Phu Chang, Jackson Hian Wui Stephen M. Griffith Hien, To Thi Kong, Steven Soon-Kai Le, Hoai Nam Huang, Hsiang-Yu Sheu, Guey-Rong Lin, Neng-Huei
author_sort	Nguyen, Ly Sy Phu
title	Trans-boundary air pollution in a Southeast Asian megacity: Case studies of the synoptic meteorological mechanisms and impacts on air quality
title_short	Trans-boundary air pollution in a Southeast Asian megacity: Case studies of the synoptic meteorological mechanisms and impacts on air quality
title_full	Trans-boundary air pollution in a Southeast Asian megacity: Case studies of the synoptic meteorological mechanisms and impacts on air quality
title_fullStr	Trans-boundary air pollution in a Southeast Asian megacity: Case studies of the synoptic meteorological mechanisms and impacts on air quality
title_full_unstemmed	Trans-boundary air pollution in a Southeast Asian megacity: Case studies of the synoptic meteorological mechanisms and impacts on air quality
title_sort	trans-boundary air pollution in a southeast asian megacity: case studies of the synoptic meteorological mechanisms and impacts on air quality
publisher	Elsevier B.V.
publishDate	2022
url	https://eprints.ums.edu.my/id/eprint/32643/1/Trans-boundary%20air%20pollution%20in%20a%20Southeast%20Asian%20megacity.pdf https://eprints.ums.edu.my/id/eprint/32643/2/Trans-boundary%20air%20pollution%20in%20a%20Southeast%20Asian%20megacity1.pdf https://eprints.ums.edu.my/id/eprint/32643/ https://www.sciencedirect.com/science/article/pii/S1309104222000526?casa_token=EyIRUq4JyxEAAAAA:uHzmSOhOU-m9jq5pRJSVm5AMHje0EA6wesX55EkcxPshcstaWjvJsjN48S4WMFKLfU8j7M_rxKk https://doi.org/10.1016/j.apr.2022.101366
_version_	1760231054423097344
score	13.211869

Trans-boundary air pollution in a Southeast Asian megacity: Case studies of the synoptic meteorological mechanisms and impacts on air quality

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