Lusaka, Zambia, during SAFARI-2000: Convergence of local and imported ozone pollution

Anne Mee Thompson, Jacquelyn C. Witte, M. Tal Freiman, N. Agnes Phahlane, Gert J.R. Coetzee

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

In August and September, throughout south central Africa, seasonal clearing of dry vegetation and other fire- related activities lead to intense smoke haze and ozone formation. The first ozone soundings in the heart of the southern African burning region were taken at Lusaka, Zambia (15.5S, 28E) in early September 2000. Maximum surface ozone was over 90 ppbv and column tropospheric ozone exceeded 50 DU. These values are higher than concurrent measurements over Nairobi (IS, 38E) and Irene (25S, 28E, near Pretoria). At least 30% of Lusaka surface ozone appears to be from local sources. A layer at 800-500 hPa has ozone > 120 ppbv and originates from transboundary recirculation. Starting out over Zambia, Angola, and Namibia, ozone-rich air travels east to the Indian Ocean, before heading back toward Mozambique, Zimbabwe and Zambia. Thus, Lusaka collects local and imported pollution, consistent with its location within the southern African gyre.

Original languageEnglish (US)
Pages (from-to)37-31
Number of pages7
JournalGeophysical Research Letters
Volume29
Issue number20
StatePublished - Oct 15 2002

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Zambia
pollution
ozone
Angola
Mozambique
air transportation
Zimbabwe
Namibia
haze
gyre
clearing
Indian Ocean
smoke
sounding
vegetation
travel
air

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Thompson, A. M., Witte, J. C., Freiman, M. T., Phahlane, N. A., & Coetzee, G. J. R. (2002). Lusaka, Zambia, during SAFARI-2000: Convergence of local and imported ozone pollution. Geophysical Research Letters, 29(20), 37-31.
Thompson, Anne Mee ; Witte, Jacquelyn C. ; Freiman, M. Tal ; Phahlane, N. Agnes ; Coetzee, Gert J.R. / Lusaka, Zambia, during SAFARI-2000 : Convergence of local and imported ozone pollution. In: Geophysical Research Letters. 2002 ; Vol. 29, No. 20. pp. 37-31.
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Thompson, AM, Witte, JC, Freiman, MT, Phahlane, NA & Coetzee, GJR 2002, 'Lusaka, Zambia, during SAFARI-2000: Convergence of local and imported ozone pollution', Geophysical Research Letters, vol. 29, no. 20, pp. 37-31.

Lusaka, Zambia, during SAFARI-2000 : Convergence of local and imported ozone pollution. / Thompson, Anne Mee; Witte, Jacquelyn C.; Freiman, M. Tal; Phahlane, N. Agnes; Coetzee, Gert J.R.

In: Geophysical Research Letters, Vol. 29, No. 20, 15.10.2002, p. 37-31.

Research output: Contribution to journalArticle

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Thompson AM, Witte JC, Freiman MT, Phahlane NA, Coetzee GJR. Lusaka, Zambia, during SAFARI-2000: Convergence of local and imported ozone pollution. Geophysical Research Letters. 2002 Oct 15;29(20):37-31.