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标题：Assessment of aerosol burden over Ghana
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作者：Kwabena Fosu-Amankwah ; Geoffrey E.Q. Bessardon ; Emmanuel Quansah 等
期刊名称：Scientific African
印刷版ISSN：2468-2276
出版年度：2021
卷号：14
页码：1-15
DOI：10.1016/j.sciaf.2021.e00971
语种：English
出版社：Elsevier
摘要：Highlights•Average Aerosol Optical Depth (AOD)∼0.50 was observed over Ghana with a significant contribution from the pre-monsoon season.•City centres of Takoradi and Kumasi showed higher aerosol loads (AODs∼0.80) than Accra and Tamale.•Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) backscatter model showed that distant or transported aerosol sources to the city centres are of both marine and land generated origins.•Linear regression analysis between MODIS 3 km AODs and AERONET AODs show a reasonably good correlation of∼0.60 for Aqua and Terra.AbstractAlthough air pollution in Ghana is ranked number one in environmental health threats to public health and sixth to cause of deaths, routine monitoring is rare. This paper presents fourteen years (2005-2018) assessment of aerosol optical depth (AOD) at 3 km resolution from MODIS Aqua and Terra satellites to ascertain the Spatio-temporal and seasonal distribution of aerosols over Ghana and its major cities. The MODIS AOD at 3 km were validated against ground-based Aerosol Robotic Network (AERONET) AODs to ascertain the suitability of the MODIS 3 km data for air quality application in the region. The contribution of distant aerosols to city aerosol loadings was also assessed with Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) backscatter model. A moderate-high aerosol burden (AODs∼0.50) was observed over Ghana with a significant contribution from the pre-monsoon season. City centres of Takoradi and Kumasi showed higher aerosol loads (AODs∼0.80) than Accra and Tamale. The HYSPLIT model showed that distant or transported aerosol sources to the city centres were of both marine and land generated origins. Linear regression analysis between MODIS AOD and AERONET AOD showed a reasonably good correlation of∼0.60 for Aqua and Terra. From the validation analysis, both Aqua and Terra satellites can be used for air quality monitoring over Ghana; however, more ground research must be conducted to ascertain better aerosol model assumptions for the region.
关键词：KeywordsAerosolsAODGhanaMODISAERONETHYSPLIT