Staff View: Spatio-temporal assessment of nocturnal surface ozone in Malaysia

Spatio-temporal assessment of nocturnal surface ozone in Malaysia

This study aims to determine the level and potential sources of nocturnal surface ozone (NSO) in different regions in Malaysia. Eleven-year (2005–2015) ozone data from 37 continuous air quality monitoring stations throughout Malaysia have been analysed to determine spatio-temporal variations in NSO...

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Main Authors:	Yusoff, Mohd Famey, Latif, Mohd Talib, Juneng, Liew, Khan, Md Firoz, Ahamad, Fatimah, Chung, Jing Xiang, Mohtar, Anis Asma Ahmad
Format:	Article
Published:	Elsevier 2019
Subjects:	Q Science (General) QD Chemistry
Online Access:	http://eprints.um.edu.my/22946/ https://doi.org/10.1016/j.atmosenv.2019.03.023
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spelling	my.um.eprints.229462019-11-04T07:01:58Z http://eprints.um.edu.my/22946/ Spatio-temporal assessment of nocturnal surface ozone in Malaysia Yusoff, Mohd Famey Latif, Mohd Talib Juneng, Liew Khan, Md Firoz Ahamad, Fatimah Chung, Jing Xiang Mohtar, Anis Asma Ahmad Q Science (General) QD Chemistry This study aims to determine the level and potential sources of nocturnal surface ozone (NSO) in different regions in Malaysia. Eleven-year (2005–2015) ozone data from 37 continuous air quality monitoring stations throughout Malaysia have been analysed to determine spatio-temporal variations in NSO concentrations. NSO daily maximum concentrations from different regions in Malaysia were used for seasonal variation analysis while linear regression and the Mann-Kendall trend test were used for the annual variation analysis. Average ratios of mean NSO to daytime surface ozone (DSO) for the whole country were found to be 60% of DSO (0.58–0.61). The east coast of the Malaysian Peninsula recorded the highest ratio (70% of DSO) while the central region recorded the lowest concentration (50% of DSO). Titration processes, particularly by NO in the urban areas of the central region, and long transboundary movement of ozone to the east coast are expected to influence the concentration of ozone in these two regions, respectively. On certain occasions, the NSO concentrations (with a maximum value of 137 ppb) exceeded the limit of 100 ppb, the value suggested by Malaysian Air Quality Standard for ambient ozone concentration. The monthly diurnal variation analysis revealed the occurrence of secondary/nocturnal peaks at more than 50% of the stations occurring around 0300–0500 h. The NSO was found to be influenced by the monsoonal season with higher concentrations mainly observed during the boreal winter season. The long-term trend analysis presented the country's overall NSO as having an increasing trend at 27% of the stations. Elsevier 2019 Article PeerReviewed Yusoff, Mohd Famey and Latif, Mohd Talib and Juneng, Liew and Khan, Md Firoz and Ahamad, Fatimah and Chung, Jing Xiang and Mohtar, Anis Asma Ahmad (2019) Spatio-temporal assessment of nocturnal surface ozone in Malaysia. Atmospheric Environment, 207. pp. 105-116. ISSN 1352-2310 https://doi.org/10.1016/j.atmosenv.2019.03.023 doi:10.1016/j.atmosenv.2019.03.023
institution	Universiti Malaya
building	UM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Malaya
content_source	UM Research Repository
url_provider	http://eprints.um.edu.my/
topic	Q Science (General) QD Chemistry
spellingShingle	Q Science (General) QD Chemistry Yusoff, Mohd Famey Latif, Mohd Talib Juneng, Liew Khan, Md Firoz Ahamad, Fatimah Chung, Jing Xiang Mohtar, Anis Asma Ahmad Spatio-temporal assessment of nocturnal surface ozone in Malaysia
description	This study aims to determine the level and potential sources of nocturnal surface ozone (NSO) in different regions in Malaysia. Eleven-year (2005–2015) ozone data from 37 continuous air quality monitoring stations throughout Malaysia have been analysed to determine spatio-temporal variations in NSO concentrations. NSO daily maximum concentrations from different regions in Malaysia were used for seasonal variation analysis while linear regression and the Mann-Kendall trend test were used for the annual variation analysis. Average ratios of mean NSO to daytime surface ozone (DSO) for the whole country were found to be 60% of DSO (0.58–0.61). The east coast of the Malaysian Peninsula recorded the highest ratio (70% of DSO) while the central region recorded the lowest concentration (50% of DSO). Titration processes, particularly by NO in the urban areas of the central region, and long transboundary movement of ozone to the east coast are expected to influence the concentration of ozone in these two regions, respectively. On certain occasions, the NSO concentrations (with a maximum value of 137 ppb) exceeded the limit of 100 ppb, the value suggested by Malaysian Air Quality Standard for ambient ozone concentration. The monthly diurnal variation analysis revealed the occurrence of secondary/nocturnal peaks at more than 50% of the stations occurring around 0300–0500 h. The NSO was found to be influenced by the monsoonal season with higher concentrations mainly observed during the boreal winter season. The long-term trend analysis presented the country's overall NSO as having an increasing trend at 27% of the stations.
format	Article
author	Yusoff, Mohd Famey Latif, Mohd Talib Juneng, Liew Khan, Md Firoz Ahamad, Fatimah Chung, Jing Xiang Mohtar, Anis Asma Ahmad
author_facet	Yusoff, Mohd Famey Latif, Mohd Talib Juneng, Liew Khan, Md Firoz Ahamad, Fatimah Chung, Jing Xiang Mohtar, Anis Asma Ahmad
author_sort	Yusoff, Mohd Famey
title	Spatio-temporal assessment of nocturnal surface ozone in Malaysia
title_short	Spatio-temporal assessment of nocturnal surface ozone in Malaysia
title_full	Spatio-temporal assessment of nocturnal surface ozone in Malaysia
title_fullStr	Spatio-temporal assessment of nocturnal surface ozone in Malaysia
title_full_unstemmed	Spatio-temporal assessment of nocturnal surface ozone in Malaysia
title_sort	spatio-temporal assessment of nocturnal surface ozone in malaysia
publisher	Elsevier
publishDate	2019
url	http://eprints.um.edu.my/22946/ https://doi.org/10.1016/j.atmosenv.2019.03.023
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score	13.211869

Spatio-temporal assessment of nocturnal surface ozone in Malaysia

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