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Browsing by Author "Otter, L"

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Assessment of ozone impacts on vegetation in southern Africa and directions for future research

Author: Van Tienhoven, AM ; Otter, L ; Lenkopane, M ; Venjonoka, K ; Zunckel, M Date: Mar 2005 Levels of background ozone in Southern Africa are high enough to cause concern, as they frequently exceed the 40 ppb threshold currently adopted by the United Nations Economic Commission for Europe. They also surpass the exposure index of ... Read more
Modelled surface ozone over southern africa during the cross border air pollution impact assessment project

Author: Zunckel, M ; Koosailee, A ; Yarwood, G ; Maure, G ; Venjonoka, K ; Van Tienhoven, AM ; Otter, L Date: Jul 2006 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 ... Read more
Nitrogen cycling in the soil-plant system along a precipitation gradient in the Kalahari sands

Author: Aranibar, JN ; Otter, L ; Macko, SA ; Feral, CJW ; Epstein, HE ; Dowty, PR ; Eckardt, F ; Shugart, HH ; Swap, RJ Date: Mar 2004 Nitrogen (N) cycling was analyzed in the Kalahari region of southern Africa, where a strong precipitation gradient (from 978 to 230 mm mean annual precipitation) is the main variable affecting vegetation. The region is underlain by a homogeneous ... Read more
Preliminary assessment of risk of ozone impacts to maize (Zea mays) in Southern Africa

Author: Van Tienhoven, AM ; Zunckel, M ; Emberson, L ; Koosailee, A ; Otter, L Date: Mar 2006 Surface ozone concentrations in southern Africa exceed air quality guidelines set to protect agricultural crops. This paper addresses a knowledge gap by performing a preliminary assessment of potential ozone impacts on vegetation in southern ... Read more
Semivolatile behaviour of dicarboxylic acids and other polar organic species at a rural background site (Nylsvley, RSA)

Author: Limbeck, A ; Puxbaum, H ; Otter, L ; Scholes, MC Date: 2001 In this study aerosol samples from the South African savannah were analyzed for their polar organic constituents. Samples were collected with a front/back-up filter tandem system of quartz fibre filters (dual filter strategy). In all samples ... Read more

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Browsing by Author "Otter, L"

Browsing by Author "Otter, L"

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