Browsing Faculty of Natural and Agricultural Sciences by Author "Jaars, Kerneels"

Now showing items 1-6 of 6

    • Automated continuous air monitoring 

      Beukes, Johan Paul; Venter, Andrew Derick; Josipovic, Miroslav; Van Zyl, Pieter Gideon; Jaars, Kerneels; Dunn, Marcell; Laakso, Lauri (Elsevier, 2015)
      Anthropogenic and anthropogenically induced emissions (such as emissions due to land use change) of various gaseous and particulate atmospheric species have substantially increased since the onset of the industrial ...

    • A comparison of surface NO2 mixing ratios and total column observations at a South African site 

      Josipovic, Micky; Burger, Roelof P.; Thompson, Anne M.; Beukes, Johan P.; Van Zyl, Pieter G.; Venter, Andrew D.; Jaars, Kerneels; Laakso, Lauri (SASAS, 2014)
      The total column density nitrogen dioxide (NO2) retrievals collated by a ground-based sun-tracking spectrometer (Pandora/GSFC) and the satellite-borne (Aura) Ozone Monitoring Instrument (OMI) were compared to the volume ...

    • Ozone concentrations and their potential impacts on Vegetation in Southern Africa 

      Laakso, Lauri; Beukes, Johan Paul; Van Zyl, Pieter Gideon; Pienaar, Jacobus J.; Josipovic, Miroslav; Venter, Andrew; Jaars, Kerneels (Elsevier, 2013)
      The tropospheric ozone concentrations over southern Africa are relatively high due to large precursor emissions from biomass burning, vegetation and anthropogenic sources and the intensity of solar radiation. In this study, ...

    • Rapid changes in biomass burning aerosols by atmospheric oxidation 

      Vakkari, Ville; Beukes, Johan Paul; Tiitta, Petri; Van Zyl, Pieter G.; Josipovic, Miroslav; Venter, Andrew D.; Jaars, Kerneels; Laakso, Lauri (Wiley, 2014)
      Primary and secondary aerosol particles originating from biomass burning contribute significantly to the atmospheric aerosol budget and thereby to both direct and indirect radiative forcing. Based on detailed measurements ...

    • Reevaluating the contribution of sulfuric acid and the origin of organic compounds in atmospheric nanoparticle growth 

      Vakkari, Ville; Tiitta, Petri; Jaars, Kerneels; Beukes, Johan Paul; Josipovic, Miroslav; Venter, Andrew D.; Van Zyl, Pieter G.; Laakso, Lauri (Wiley, 2015)
      Aerosol particles formed in the atmosphere are important to the Earth's climate system due to their ability to affect cloud properties. At present, little is known about the atmospheric chemistry responsible for the growth ...

    • Size-resolved characterisation of organic compounds in atmospheric aerosols collected at Welgegund, South Africa 

      Booyens, Wanda; Van Zyl, Pieter G.; Beukes, Johan P.; Josipovic, Miroslav; Venter, Andrew D.; Jaars, Kerneels; Pienaar, Jacobus J.; Laakso, Lauri (Springer, 2015)
      The organic fraction of atmospheric aerosols is 20 to 90 % of which only a small percentage has been chemically characterised. Two-dimensional gas chromatography with a time-of-flight mass spectrometer (GCxGC-TOFMS) is a ...