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| Titel |
An overview of regional and local characteristics of aerosols in South Africa using satellite, ground, and modeling data |
| VerfasserIn |
S. P. Hersey, R. M. Garland, E. Crosbie, T. Shingler, A. Sorooshian, S. Piketh, R. Burger |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 8 ; Nr. 15, no. 8 (2015-04-24), S.4259-4278 |
| Datensatznummer |
250119664
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| Publikation (Nr.) |
 copernicus.org/acp-15-4259-2015.pdf |
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| Zusammenfassung |
We present a comprehensive overview of particulate air quality across the
five major metropolitan areas of South Africa (Cape Town, Bloemfontein,
Johannesburg and Tshwane (Gauteng Province), the Industrial Highveld Air
Quality Priority Area (HVAPA), and Durban), based on a decadal (1 January 2000
to 31 December 2009) aerosol climatology from multiple satellite platforms and
detailed analysis of ground-based data from 19 sites throughout Gauteng
Province. Satellite analysis was based on aerosol optical depth (AOD) from
MODIS Aqua and Terra (550 nm) and MISR (555 nm) platforms, Ångström
Exponent (α) from MODIS Aqua (550/865 nm) and Terra (470/660 nm),
ultraviolet aerosol index (UVAI) from TOMS, and results from the
Goddard Ozone Chemistry Aerosol Radiation and Transport (GOCART) model. At
continentally influenced sites, AOD, α, and UVAI reach maxima
(0.12–0.20, 1.0–1.8, and 1.0–1.2, respectively) during austral spring
(September–October), coinciding with a period of enhanced dust generation and the
maximum integrated intensity of close-proximity and subtropical fires
identified by MODIS Fire Information for Resource Management System (FIRMS).
Minima in AOD, α, and UVAI occur during winter. Results from ground
monitoring indicate that low-income township sites experience by far the
worst particulate air quality in South Africa, with seasonally averaged
PM10 concentrations as much as 136% higher in townships that in
industrial areas.
We report poor agreement between satellite and ground aerosol measurements,
with maximum surface aerosol concentrations coinciding with minima in AOD,
α, and UVAI. This result suggests that remotely sensed data are not an
appropriate surrogate for ground air quality in metropolitan South Africa. |
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