Ozone

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https://repoemc.ukm.my/handle/123456789/72

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Browsing Ozone by Author "Fatimah Ahamad"

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    Madden Julian oscillation modulation for surface ozone in Peninsular Malaysia
    (Elsevier, 2020) Mary Angelina Jud; Liew Juneng; Fredolin T. Tangang; Mohd Talib Latif; Jing Xiang Chung; Fatimah Ahamad
    This study investigates the modulation of Madden-Julian Oscillation (MJO) on surface ozone (O3) variability in Peninsular Malaysia. A 17-years (2000-2016) record of daily maximum surface ozone (O3Max) concentration from 24 air quality monitoring stations across Peninsular Malaysia were divided into six sub-regions namely R1, R2, R3, R4, R5 and R6. To investigate MJO modulation on O3Max, total cloud cover (TCC), surface air temperature (SAT) and surface wind from ERA Interim Reanalysis were also analyzed.
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    Seasonal and long term variations of surface ozone concentrations in Malaysian Borneo
    (Elsevier, 2016) Mohd Talib Latif; Doreena Dominick; Fatimah Ahamad; Nur Shuhada Ahamad; Md Firoz Khan; Liew Juneng; Chung Jing Xiang; Mohd Shahrul Mohd Nadzir; Andrew D. Robinson; Marzuki Ismail; Mohammed Iqbal Mead; Neil R.P. Harris
    Malaysian Borneo has a lower population density and is an area known for its lush rainforests. However, changes in pollutant profiles are expected due to increasing urbanisation and commercial-industrial activities. This study aims to determine the variation of surface O3 concentration recorded at seven selected stations in Malaysian Borneo. Hourly surface O3 data covering the period 2002 to 2013, obtained from the Malaysian Department of Environment (DOE), were analysed using statistical methods.
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    Spatio-temporal assessment of nocturnal surface ozone in Malaysia
    (Elsevier, 2019) Mohd Famey Yusoff; Mohd Talib Latifa; Liew Juneng; Md Firoz Khan; Fatimah Ahamad; Jing Xiang Chung; Anis Asma Ahmad Mohtar
    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.
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    Variation of surface ozone exceedance around Klang Valley, Malaysia
    (Elsevier, 2014) Fatimah Ahamad; Mohd Talib Latif; Rosy Tang; Liew Juneng; Doreena Dominick; Hafizan Juahir
    The total hourly surface ozone (O3) exceedance from the 100 ppbv hourly O3 standard set by the Department of Environment Malaysia (DOE) was analysed, as elevated O3 concentrations pose health risks to humans and harms vegetation. Air quality data from 2008 to 2010 were obtained from a total of seven stations located around the west coast of Peninsular Malaysia.