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Atmospheric aerosol loading off the east coast of southern Africa

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dc.contributor.advisor Piketh SJ en
dc.contributor.advisor Annegarn HJ en
dc.contributor.author Queface AJ en
dc.date.accessioned 2016-09-22T11:18:07Z
dc.date.available 2016-09-22T11:18:07Z
dc.date.created 1999 en
dc.date.submitted 2002 en
dc.identifier.uri http://hdl.handle.net/20.500.11892/109411
dc.description.abstract Characterisation of aerosol optical properties over southern Africa is needed for better understanding the impact of aerosols on regional climate change. CIMEL Sun Photometer measurements of aerosol optical thickness over Inhaca Island, Mozambique between April and November 2000 are analysed. Comparisons with two other sites, Mongu, Zambia and Bethlehem, South Africa are made. The aerosol optical thickness observed at Inhaca Island indicates high turbidity. In ~ 50% of the measurements, aerosol optical thickness values were above 0.2, with an overall mean of 0.26 �0.19. The Angstrom exponent parameter has a wide range from 0.2 to 2, with a modal value of 1.6. This indicates a wide range in particle sizes and a dominance of fine mode aerosols at this site. Data from all three sites reveal seasonal variability, with significant increases in aerosol loading between August and October. This suggests a strong contribution of biomass burning to the aerosol loading, as it is known that August-October is the biomass burning season in southern Africa. A north to south gradient in aerosol optical thickness is confirmed. The highest aerosol content is observed in Mongu, while Bethlehem has the lowest. The retrieved aerosol volume size distribution over Inhaca Island demonstrates that at high levels of aerosol optical thickness, accumulation mode aerosols dominate. In contrast coarse mode aerosols dominate when aerosol optical thickness is very low. The high aerosol optical thicknesses are mostly associated with the continental flow, while low aerosol optical thicknesses are often linked to the maritime air transport to the site. en
dc.language English en
dc.title Atmospheric aerosol loading off the east coast of southern Africa en
dc.type Masters degree en
dc.description.degree MSc en

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