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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2017-133
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
21 Feb 2017
Review status
This discussion paper is under review for the journal Atmospheric Chemistry and Physics (ACP).
Stratospheric Aerosol Climatology over Ethiopia and Retrieval of its Size Distribution
Milkessa Gebeyehu Homa1, Gizaw Mengistu Tsidu2, and Derese Tekestebrihan Nega1 1Jimma University, College of Natural Sciences, Department of Physics, Jimma, Ethiopia
2Addis Ababa University, College of Natural Sciences, Department of Physics, Addis Ababa, Ethiopia
Abstract. Stratospheric aerosols play significant role both positively and negatively in Earths energy balance and climate change. Its main sources are particulate matters which arises from either of natural or anthropogenic activities. In the context of our country, Ethiopia, the stratospheric aerosol climatology has not been studied yet. However, Ethiopia is undergoing a boom of infrastructural development like increase of urbanization, which comes with a boom of development like building and road constructions, expansion of industries, traffic density, etc, which contributes to air pollution and influences the solar radiation budget of the earth-atmosphere system, which in turn influences the climate on the surface of the Earth by different ways. Hence, this study aimed to provide the stratospheric aerosol climatology for nearly 21 years extending from Oct., 1984 to Sept., 2005. The study was carried out by defining the stratospheric region from the temperature profile of the study area provided by Stratospheric Aerosols and Gas Experiment II (SAGEII) instrument aboard on Earths Radiation Budget Satellite (ERBS). Then, the data was filtered out over Ethiopian region at four aerosol channels and the optical depth is used as input to the Mie algorithm for aerosol size distribution (ASD) retrieval. Finally, it was observed that the spectral and vertical variation of the extinction is maximum between 17–25 km and the total column aerosol optical depth (AOD) temporal variation shows nearly steadily increasing trend with maximum variation during spring. Furthermore, from the ASD result it was observed that the maximum size distribution was in April. This paves a clue about their sources to be mechanical process on the ground and gas to particle conversion in the stratosphere with the dominant size distribution in the range of 0.452–0.525 μm radius.

Citation: Homa, M. G., Tsidu, G. M., and Nega, D. T.: Stratospheric Aerosol Climatology over Ethiopia and Retrieval of its Size Distribution, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-133, in review, 2017.
Milkessa Gebeyehu Homa et al.
Milkessa Gebeyehu Homa et al.
Milkessa Gebeyehu Homa et al.

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Short summary
This article provides aerosol climatology of Ethiopia for 21 years. The result showed that aerosol loading over the region is steadily increasing in different sizes. The dominant radius of the particulate matters are between 0.452–0.525 μm, & dominated by reflective type aerosol. This influence the solar radiation budget of the earth, which in turn influences the Earth's climate in different ways. Hence, it is the right time to give the right attention to air quality & climate change impacts.
This article provides aerosol climatology of Ethiopia for 21 years. The result showed that...
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