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<p>Southern hemisphere (SH) registers significant seasonal variations due to westerly winds, and observes an important intercontinental air pollution transport. We investigate aerosol optical properties based on AERONET/PHOTONS ground measurements of fifteen SH sites. Aerosol optical depth AOD<sub>0,5</sub> increases from August to October over South African sites with a peak reaching 0.4, and aerosol particle size distributions display the predominance of fine mode. However, the coarse mode was high in East Africa. The relating AOD<sub>0,5</sub> versus Ångström exponent (α<sub>0.44–0.87</sub>) shows a dominated two main aerosol types, marine aerosols (CM) neighboring to the ocean, and urban/industrial pollution and biomass-burning particles (BB/UI). The aerosol radiative forcing of the vertical columnar atmospheric balance showed a heating effect in all sites with high values observed over South African sites suggesting a large abundance of absorbing aerosols and mostly biomass burning. The variation of single scattering albedo (SSA) over all the studied sites reveals the presence of many aerosol particle classes during the whole period (2018–19).</p>

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Aerosol type influences on air and climate over the southern hemisphere

  • 期刊论文

  • 发表日期：

    2025年7月26日

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  • Ibtissam Marsli,
  • Mohammed Diouri

摘要

Southern hemisphere (SH) registers significant seasonal variations due to westerly winds, and observes an important intercontinental air pollution transport. We investigate aerosol optical properties based on AERONET/PHOTONS ground measurements of fifteen SH sites. Aerosol optical depth AOD0,5 increases from August to October over South African sites with a peak reaching 0.4, and aerosol particle size distributions display the predominance of fine mode. However, the coarse mode was high in East Africa. The relating AOD0,5 versus Ångström exponent (α0.44–0.87) shows a dominated two main aerosol types, marine aerosols (CM) neighboring to the ocean, and urban/industrial pollution and biomass-burning particles (BB/UI). The aerosol radiative forcing of the vertical columnar atmospheric balance showed a heating effect in all sites with high values observed over South African sites suggesting a large abundance of absorbing aerosols and mostly biomass burning. The variation of single scattering albedo (SSA) over all the studied sites reveals the presence of many aerosol particle classes during the whole period (2018–19).