Search Results - "Beukes, Johan P."

Major secondary aerosol formation in southern African open biomass burning plumes by Vakkari, Ville, Beukes, Johan P., Dal Maso, Miikka, Aurela, Mika, Josipovic, Miroslav, van Zyl, Pieter G.

“…Open biomass burning contributes significantly to air quality degradation and associated human health impacts over large areas. It is one of the largest…”
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Measurement report: Statistical modelling of long-term trends of atmospheric inorganic gaseous species within proximity of the pollution hotspot in South Africa by Swartz, Jan-Stefan, van Zyl, Pieter G, Beukes, Johan P, Galy-Lacaux, Corinne, Ramandh, Avishkar, Pienaar, Jacobus J

“…South Africa is considered an important source region of atmospheric pollutants, which is compounded by high population and industrial growth. However, this…”
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An Overview of Currently Applied Ferrochrome Production Processes and Their Waste Management Practices by Stephanus P. du Preez, Tristan P. M. van Kaam, Eli Ringdalen, Merete Tangstad, Kazuki Morita, Dmitri G. Bessarabov, Pieter G. van Zyl, Johan P. Beukes

“…Ferrochrome (FeCr) is the main source of virgin chromium (Cr) units used in modern-day chromium (Cr) containing alloys. The vast majority of produced Cr is…”
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The Use of Hydrogen as a Potential Reductant in the Chromite Smelting Industry by Jamey Davies, Dogan Paktunc, José Juan Ramos-Hernandez, Merete Tangstad, Eli Ringdalen, Johan P. Beukes, Dmitri G. Bessarabov, Stephanus P. Du Preez

“…The chromium (Cr) content of stainless steel originates from recycled scrap and/or ferrochrome (FeCr), which is mainly produced by the carbothermic reduction…”
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The composition of ambient and fresh biomass burning aerosols at a savannah site, South Africa by Aurela, Minna, Beukes, Johan P, van Zyl, Pieter, Vakkari, Ville, Teinila, Kimmo, Saarikoski, Sanna, Laakso, Lauri

“…Atmospheric aerosols play a key role in climate change, and have adverse effects on human health. Given South Africa's status as a rapidly-developing country…”
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Characterising Particulate Organic Nitrogen at A Savannah-Grassland Region in South Africa by Booyens, Wanda, Van Zyl, Pieter G., Beukes, Johan P., Ruiz-Jimenez, Jose, Kopperi, Matias, Riekkola, Marja-Liisa, Vakkari, Ville, Josipovic, Miroslav, Kulmala, Markku, Laakso, Lauri

“…Although atmospheric organic N compounds are considered to be important, especially in new particle formation and their contribution to brown carbon, these…”
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Assessment of atmospheric trace metals in the Western Bushveld igneous complex, South Africa by van Zyl, Pieter G, Beukes, Johan P, du Toit, Grizelda, Mabaso, Desmond, Hendriks, Johan, Vakkari, Ville, Tiitta, Petri, Pienaar, Jacobus J, Kulmala, Markku, Laakso, Lauri

“…Trace metal species emitted into the atmosphere from natural and anthropogenic sources can cause various health-related and environmental problems. Limited…”
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Summary of research paper published in Journal of Atmospheric Chemistry titled: Assessment of polar organic aerosols at a regional background site in southern Africa by Booyens, Wanda, Beukes, Johan P, Van Zyl, Pieter G, Ruiz-Jimenez, Jose, Kopperi, Matias, Riekkola, Marja-Liisa, Josipovic, Miroslav, Vakkari, Ville, Laakso, Lauri

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Modelling new particle formation events in the South African savannah by Gierens, Rosa T, Laakso, Lauri, Mogensen, Ditte, Vakkari, Ville, Beukes, Johan P, van Zyl, Pieter G, Hakola, Hannele, Guenther, Alex, Pienaar, Jacobus J, Boy, Michael

“…Africa is one of the less studied continents with respect to atmospheric aerosols. Savannahs are complex dynamic systems sensitive to climate and land-use…”
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Free Tropospheric Aerosols Over South Africa by Elina, Giannakaki, Pfüller, Anne, Korhonen, Kimmo, Mielonen, Tero, Laakso, Lauri, Vakkari, Ville, Baars, Holger, Engelmann, Ronny, Beukes, Johan P., Van Zyl, Pieter G., Josipovic, Miroslav, Tiitta, Petri, Chiloane, Kgaugelo, Piketh, Stuart, Lihavainen, Heikki, Lehtinen, Kari

“…Raman lidar data of one year was been analyzed to obtain information relating aerosol layers in the free troposphere over South Africa, Elandsfontein. In…”
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Atmospheric trace metals measured at a regional background site (Welgegund) in South Africa by Venter, Andrew D, van Zyl, Pieter G, Beukes, Johan P, Josipovic, Micky, Hendriks, Johan, Vakkari, Ville, Laakso, Lauri

“…Atmospheric trace metals can cause a variety of health-related and environmental problems. Only a few studies on atmospheric trace metal concentrations have…”
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The effect of rainfall amount and timing on annual transpiration in a grazed savanna grassland by Räsänen, Matti, Aurela, Mika, Vakkari, Ville, Beukes, Johan P, Tuovinen, Juha-Pekka, Van Zyl, Pieter G, Josipovic, Miroslav, Siebert, Stefan J, Laurila, Tuomas, Kulmala, Markku, Laakso, Lauri, Rinne, Janne, Oren, Ram, Katul, Gabriel

“…The role of precipitation (P) variability with respect to evapotranspiration (ET) and its two components, transpiration (T) and evaporation (E), from savannas…”
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Source apportionment of ambient PM10-2.5 and PM2.5 for the Vaal Triangle, South Africa by Muyemeki, Luckson, Burger, Roelof, Piketti, Stuart J, Language, Brigitte, Beukes, Jotan P, van Zyl, Pieter G

“…The Vaal Triangle Airshed Priority Area (VTAPA), like other priority areas in South Africa, has an air pollution problem. Understanding the sources…”
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Composition and Cr- and Fe-speciation of dust generated during ferrochrome production in a DC arc furnace by Berryman, Eleanor J., Paktunc, Dogan, Kingston, David, Beukes, Johan P.

“…A potential hazard associated with ferrochrome production is the unintentional generation of Cr(VI) in the off-gas dusts produced during smelting. Cr(VI) is a…”
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Measurement report: Size-resolved chemical characterisation of aerosols in low-income urban settlements in South Africa by Segakweng, Constance K, van Zyl, Pieter G, Liousse, Cathy, Beukes, Johan P, Swartz, Jan-Stefan, Gardrat, Eric, Dias-Alves, Maria, Language, Brigitte, Burger, Roelof P, Piketh, Stuart J

“…Naturally and anthropogenically emitted aerosols, which are determined by their physical and chemical properties, have an impact on both air quality and the…”
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Assessment of polar organic aerosols at a regional background site in southern Africa by Booyens, Wanda, Beukes, Johan P., Van Zyl, Pieter G., Ruiz-Jimenez, Jose, Kopperi, Matias, Riekkola, Marja-Liisa, Josipovic, Miroslav, Vakkari, Ville, Laakso, Lauri

“…A recent paper reported GCxGC-TOFMS analysis used for the first time in southern Africa to tentatively characterise and semi-quantify ~1000 organic compounds…”
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Measurements of biogenic volatile organic compounds at a grazed savannah grassland agricultural landscape in South Africa by Jaars, Kerneels, van Zyl, Pieter G, Beukes, Johan P, Hellén, Heidi, Vakkari, Ville, Josipovic, Micky, Venter, Andrew D, Räsänen, Matti, Knoetze, Leandra, Cilliers, Dirk P, Siebert, Stefan J, Kulmala, Markku, Rinne, Janne, Guenther, Alex, Laakso, Lauri, Hakola, Hannele

“…Biogenic volatile organic compounds (BVOCs) play an important role in the chemistry of the troposphere, especially in the formation of tropospheric ozone (O3)…”
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Carbon balance of a grazed savanna grassland ecosystem in South Africa by Räsänen, Matti, Aurela, Mika, Vakkari, Ville, Beukes, Johan P, Tuovinen, Juha-Pekka, Van Zyl, Pieter G, Josipovic, Miroslav, Venter, Andrew D, Jaars, Kerneels, Siebert, Stefan J, Laurila, Tuomas, Rinne, Janne, Laakso, Lauri

“…Tropical savannas and grasslands are estimated to contribute significantly to the total primary production of all terrestrial vegetation. Large parts of…”
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Temporal and source assessments of organic and elemental carbon at sites in the northern South African interior by Maritz, Petra, Beukes, Johan P., van Zyl, Pieter G., Liousse, Catherine, Gardrat, Eric, Ramandh, Avishkar, Mkhatshwa, Gabisile V.

“…Particulate matter (PM) can affect climate, air quality, human health, acid deposition and visibility, and contain a significant fraction of organic (OC) and…”
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Size-resolved characteristics of inorganic ionic species in atmospheric aerosols at a regional background site on the South African Highveld by Venter, Andrew D., van Zyl, Pieter G., Beukes, Johan P., Swartz, Jan-Stefan, Josipovic, Miroslav, Vakkari, Ville, Laakso, Lauri, Kulmala, Markku

“…Aerosols consist of organic and inorganic species, and the composition and concentration of these species depends on their sources, chemical transformation and…”
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