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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/1608

Title: Modelled surface ozone over southern africa during the cross border air pollution impact assessment project
Authors: Zunckel, M
Koosailee, A
Yarwood, G
Maure, G
Venjonoka, K
Van Tienhoven, AM
Otter, L
Keywords: Photochemical modelling
Mesoscale model 5
Biogenic emissions
Anthropogenic emissions
Issue Date: Jul-2006
Publisher: Elsevier Science Ltd
Citation: Zunckel, M, et al. 2006. Modelled surface ozone over southern africa during the cross border air pollution impact Assessment project. Environmental modelling and software, vol 21 (7), pp 911-924
Abstract: Monitoring of surface ozone over southern Africa has shown that ambient concentrations often exceed a threshold of 40 ppb at which damage to vegetation by ozone could be expected. The Cross Border Air Pollution Assessment Project (CAPIA) was therefore established to assess the potential impacts of ozone on maize, a staple food crop, in five southern African countries. Measured surface ozone data are scarce in the region so it was necessary to complement the monitoring with regional-scale photochemical modeling to achieve the objective. The Pennsylvania State and NCAR Mesoscale Model (MM5) is used to produce gridded meteorological data for 5 days in each month of the maize growing season, October to April, as input to the photochemical model, CAMx. Gridded anthropogenic emissions from industry, transport and domestic burning and gridded biogenic emissions from soils and vegetation are input to CAMx. The model estimations indicate large areas on the sub-continent where surface ozone concentrations exceed 40 ppb for up to 10 h per day. Maximum concentrations may exceed 80 ppb, particularly in the winter when mean ozone concentrations are higher. The areas where the 40 ppb threshold is exceeded coincide with maize growing areas in South Africa and Zimbabwe. It appears that neither anthropogenic emissions nor biogenic emissions are dominant in the production of surface ozone over southern Africa. Rather the formation of surface ozone over the region is attributed to the combined contribution of precursors from anthropogenic and biogenic origin.
URI: http://hdl.handle.net/10204/1608
ISSN: 1364-8152
Appears in Collections:Pollution and waste
Environmental management
General science, engineering & technology

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