Browsing by Author "Khaled Ali Ahmed Ben Youssef"

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    Evaluation of aerosol optical thickness over Malaysia based on multi-score ground and satellite data
    (Universiti Pertanian Malaysia Press, 2019) Khaled Ali Ahmed Ben Youssef; Ahmad Makmom Abdullah; Helmi Zuhaidi Mohd Shafri; Zulfa Hanan Ash'aari
    This study evaluates the spatiotemporal distribution of aerosol optical thickness (AOT) over Malaysia. The significance of aerosols in regional and global climate change assessment has become a pressing topic in recent climate discussions. Two different approaches are used in measuring AOT; satellite imagery and ground measurement approaches.However, the satellite approach is deemed the best way for monitoring the patterns and transport of aerosols largely due to its extensive spatial coverage and reliable repetitive measurements. The data in this study were obtained from a Sea-viewing Wide Field-of-view Sensor (SeaWiFS), a Multi-angle Imaging Spectroradiometer (MISR), and Moderate Resolution Imaging Spectroradiometer (MODIS) satellite sensors based on a NASA-operated Giovanni portal. Ground-based Aerosol Robotic Network (AERONET) datasets from two sites over the study area were also used.
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    The Development of Air Quality Indices Using AOD-Retrieved Images during Haze Events in Peninsular Malaysia
    (IOP Publishing, 2019) Khaled Ali Ahmed Ben Youssef; Ahmad Makmom Abdullah; Helmi Zulhaidi Mohd Shafri; Zulfa Hanan Ashaari
    Advances in satellite sensors provide new datasets to assist in the observation of air quality at urban and local scales. Quantitative Aerosol Optical Depth (AOD) and qualitative true colour image data from the Moderate Resolution Imaging Spectroradiometer (MODIS) sensor on the Terra satellite have been widely used to assess air quality.In this study, both 3 km and 10 km MODIS aerosol products were used to provide an overview of the state of fine particulate matter (PM2.5) and coarse particulate matter (PM10) during haze episodes over Peninsular Malaysia covering the period 21 to 26 June 2013.