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Urban and Rural Ozone Collect over Lusaka (Zambia, 15.5 S, 28 E) during SAFARI-2000 (September 2000)In early September, throughout south central Africa, seasonal clearing of dry vegetation and the production of charcoal for cooking leads to intense smoke haze and ozone formation. Ozone soundings made over Lusaka in early September 2000 recorded layers of high ozone (greater than 125 ppbv at 5 km) during two stagnant periods, broken by a frontal passage that reduced boundary layer ozone by 30%. During the 6-day measurement period, surface ozone concentrations ranged from 50-95 ppbv and integrated tropospheric ozone from the soundings was 39-54 Dobson Units (note 1.3 km elevation at the launch site). A stable layer of high ozone at 2-5 km was advected from rural burning regions in western Zambia and neighboring countries, making Lusaka a collection point for transboundary pollution. This is confirmed by trajectories that show ozone leaving Angola, Namibia, Botswana and South Africa before heading toward the Indian Ocean and returning to Lusaka via Mozambique and Zimbabwe. Ozone in the mixed layer at Lusaka is heavily influenced by local sources.
Document ID
20030020880
Document Type
Conference Paper
Authors
Thompson, Anne M. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Witte, Jacquelyn C. (Science Systems and Applications, Inc. Greenbelt, MD, United States)
Freiman, M. Tai (Witwatersrand Univ. Johannesburg, South Africa)
Phalane, N. Agnes (South African Weather Bureau Pretoria, South Africa)
Coetzee, Gert J. R. (South African Weather Bureau Pretoria, South Africa)
Date Acquired
August 21, 2013
Publication Date
January 1, 2002
Subject Category
Meteorology and Climatology
Meeting Information
Joint CACGP/IGAC 2002 Symposium(Heraklion)
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.