Browsing by Author "Vakkari, V."

The anthropogenic contribution to atmospheric black carbon concentrations in southern Africa: a WRF-Chem modeling study

Kuik, F.; Beukes, J.P.; Van Zyl, P.G.; Josipovic, M.; Laakso, L.; Lauer, A.; Vakkari, V. (EGU, 2015)

South Africa has one of the largest industrialized economies in Africa. Emissions of air pollutants are particularly high in the Johannesburg-Pretoria metropolitan area, the Mpumalanga Highveld and the Vaal Triangle, ...

Boundary layer nucleation as a source of new CCN in savannah environment

Laakso, L.; Merikanto, J.; Vakkari, V.; Molefe, M.; Kgabi, N. (EGU, 2013)

The South African savannah region is a complex environment of air pollution and natural emissions influenced by a strong seasonal cycle in biomass burning and strong precipitation. However, the scarcity of long-term ...

Characterisation of sub-micron particle number concentrations and formation events in the western Bushveld Igneous Complex, South Africa

Hirsikko, A.; Tiitta, P.; Beukes, J.P.; Laakso, L.; Vakkari, V. (EGU, 2012)

South Africa holds significant mineral resources, with a substantial fraction of these reserves occurring and being processed in a large geological structure termed the Bushveld Igneous Complex (BIC). The area is also ...

Factors governing the chemical composition of rain at a regional site in South Africa

Kok, L; Van Zyl, P.G.; Beukes, J.P.; Burger, R.P.; Ellis, S.M.; Josipovic, M.; Jaars, K.; Vakkari, V.; Laakso, L.; Kulmala, M. (ScienceDirect, 2023)

Precipitation chemistry is influenced by a number of complex processes, which include the temporal and spatial evolution of air masses. Previous wet deposition studies in South Africa could not distinctly relate the ...

Long-term observations of aerosol size distributions in semi-clean and polluted savannah in South Africa

Vakkari, V.; Beukes, J.P.; Mabaso, D.; Pienaar, J.J.; Laakso, L. (EGU, 2013)

This study presents a total of four years of sub-micron aerosol particle size distribution measurements in the southern African savannah, an environment with few previous observations covering a full seasonal cycle and the ...

Multiple daytime nucleation events in semi-clean savannah and industrial environments in South Africa: analysis based on observations

Hirsikko, A.; Vakkari, V.; Tiitta, P.; Beukes, J.P.; Laakso, L. (EGU, 2013)

Recent studies have shown very high frequencies of atmospheric new particle formation in different environments in South Africa. Our aim here was to investigate the causes for two or three consecutive daytime nucleation ...