Aerosol uncertainty assessment: an integrated approach of remote AQUA MODIS and AERONET data
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ORIGINAL PAPER
Aerosol uncertainty assessment: an integrated approach of remote AQUA MODIS and AERONET data Moncef Bouaziz 1,2 & Henda Guermazi 2 & Khawla Khcharem 3 & Sascha Meszner 1 & Mohamed Moncef Sarbeji 2 Received: 20 September 2018 / Accepted: 28 December 2018 # Saudi Society for Geosciences 2019
Abstract The moderate resolution imaging spectroradiometer (MODIS) is one of the widely used sensors to address environmental and climate change subjects with a daily global coverage. MODIS Collection 6 aerosol products at 10-km resolution are used in this study to monitor aerosol variability and assess its uncertainty using ground-based measurements. The aerosol optical depth (AOD) is retrieved by different algorithms based on the pixel surface, determining between land and ocean. Using data collected from Sidi Salem Aerosol Robotic Network (AERONET) station, we computed the accuracy for aerosol optical depth (AOD) retrieved from MODIS aboard the AQUA satellite using two validation methods. The results show a good agreement between MODIS and AERONET data for the study period using both the algorithms. We obtained high values of the correlation coefficient. These findings indicate that MODIS data perform well over Ben Salem AERONET station and are recommended for air quality monitoring over Tunisia. The conducted validation throughout the AERONET leads to a degree of confidence that allows a deep investigation of the AOD spatial variability over Tunisia. Then, MODIS data shows high performance with good certainty to identify the principal dust sources and typical transport paths occurring on the study region. Keywords Remote sensing . MODIS . Aerosol . AQUA . AOD . AERONET
Introduction Atmospheric aerosols are defined as airborne particles in a gaseous environment. The properties of aerosols are generally measured using in situ instruments, such as from aircraft or balloons, but these were limited to a few aerosol intensive measurement campaigns. The use of satellites to monitor aerosols has the advantage to provide measurements at a global level (Shepherd et al. 2016) and establish a significant tool to improve our understanding of the properties of aerosols. Diverse technologies of remote sensing by satellites were developed to assess the optical and physical properties of atmospheric aerosols. The first detection of aerosols from an un* Moncef Bouaziz [email protected] 1
Faculty of Environmental Sciences, Institute of Geography, TU-Dresden, Helmholtzstr. 10, 01069 Dresden, Germany
2
National School of Engineers of Sfax, Water, Energy and Environment Laboratory L3E, University of Sfax, Sfax, Tunisia
3
Faculty of Sciences, Department of Earth Sciences, University of Sfax, Sfax, Tunisia
manned spacecraft was realized by the multi spectral scanner (MSS) onboard the Earth Resources Technology Satellite (ERTS-1), and the first operational aerosol products were generated from the TIROS-N satellite launched on 19 October 1978 (Griggs 1975; Fraser 1976; Mekler et al. 1977). The moderate resolution imaging
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