Publications

Peer-reviewed publications

2022

Cogho, E., Beukes, J. P., van Zyl, P., and Vakkari, V.: The use of fire radiative power observations to determine spontaneous combustion event activities associated with coal mining on the Mpumalanga Highveld, Clean Air J., 32, https://doi.org/10.17159/caj/2022/32/2.12145, 2022. 

Räsänen, M., Aurela, M., Vakkari, V., Beukes, J. P., Tuovinen, J.-P., Van Zyl, P. G., Josipovic, M., Siebert, S. J., Laurila, T., Kulmala, M., Laakso, L., Rinne, J., Oren, R., and Katul, G.: The effect of rainfall amount and timing on annual transpiration in a grazed savanna grassland, Hydrol. Earth Syst. Sci., 26, 5773–5791, https://doi.org/10.5194/hess-26-5773-2022, 2022.

2021

Brown, H., Liu, X., Pokhrel, R., Murphy, S., Lu, Z., Saleh, R., Mielonen, T., Kokkola, H., Bergman, T., Myhre, G., Skeie, R. B., Watson-Paris, D., Stier, P., Johnson, B., Bellouin, N., Schulz, M., Vakkari, V., Beukes, J. P., van Zyl, P. G., Liu, S. and Chand, D.: Biomass burning aerosols in most climate models are too absorbing, Nat. Commun., 12(1), 277, https://doi.org/10.1038/s41467-020-20482-9, 2021. 

Kok, L., van Zyl, P.G. Beukes, J.P., Swartz, J-S., Burger, R.P., Ellis, S., Josipovic, M., Vakkari, V., Laakso, L., and Kulmala, M., Chemical composition of rain at a regional site on the South African Highveld, https://doi.org/10.17159/wsa/2021.v47.i3.11861, Water SA, 47 (3) p. 326–337, 2021 Ngoasheng, M., Beukes, J. P., van Zyl, P. G., Swartz, J.-S., Loate, V., Krisjan, P., Mpambani, S., Kulmala, M., Vakkari, V., and Laakso, L.: Assessing SO2, NO2 and O3 in rural areas of the North West Province, Clean Air J., 31, https://doi.org/10.17159/caj/2021/31/1.9087, 2021. Rose, C., Collaud Coen, M., Andrews, E., Lin, Y., Bossert, I., Lund Myhre, C., Tuch, T., Wiedensohler, A., Fiebig, M., Aalto, P., Alastuey, A., Alonso-Blanco, E., Andrade, M., Artíñano, B., Arsov, T., Baltensperger, U., Bastian, S., Bath, O., Beukes, J. P., Brem, B. T., Bukowiecki, N., Casquero-Vera, J. A., Conil, S., Eleftheriadis, K., Favez, O., Flentje, H., Gini, M. I., Gómez-Moreno, F. J., Gysel-Beer, M., Hallar, A. G., Kalapov, I., Kalivitis, N., Kasper-Giebl, A., Keywood, M., Kim, J. E., Kim, S.-W., Kristensson, A., Kulmala, M., Lihavainen, H., Lin, N.-H., Lyamani, H., Marinoni, A., Martins Dos Santos, S., Mayol-Bracero, O. L., Meinhardt, F., Merkel, M., Metzger, J.-M., Mihalopoulos, N., Ondracek, J., Pandolfi, M., Pérez, N., Petäjä, T., Petit, J.-E., Picard, D., Pichon, J.-M., Pont, V., Putaud, J.-P., Reisen, F., Sellegri, K., Sharma, S., Schauer, G., Sheridan, P., Sherman, J. P., Schwerin, A., Sohmer, R., Sorribas, M., Sun, J., Tulet, P., Vakkari, V., van Zyl, P. G., Velarde, F., Villani, P., Vratolis, S., Wagner, Z., Wang, S.-H., Weinhold, K., Weller, R., Yela, M., Zdimal, V., and Laj, P.: Seasonality of the particle number concentration and size distribution: a global analysis retrieved from the network of Global Atmosphere Watch (GAW) near-surface observatories, Atmos. Chem. Phys., 21, 17185–17223, https://doi.org/10.5194/acp-21-17185-2021, 2021.

2020

Laban, T. L., van Zyl, P. G., Beukes, J. P., Mikkonen, S., Santana, L., Josipovic, M., Vakkari, V., Thompson, A. M., Kulmala, M. and Laakso, L.: Statistical analysis of factors driving surface ozone variability over continental South Africa, J. Integr. Environ. Sci., 1–28, doi:10.1080/1943815X.2020.1768550, 2020. Laj, P., Bigi, A., Rose, C., Andrews, E., Lund Myhre, C., Collaud Coen, M., Lin, Y., Wiedensohler, A., Schulz, M., Ogren, J. A., Fiebig, M., Gliß, J., Mortier, A., Pandolfi, M., Petäja, T., Kim, S.-W., Aas, W., Putaud, J.-P., Mayol-Bracero, O., Keywood, M., Labrador, L., Aalto, P., Ahlberg, E., Alados Arboledas, L., Alastuey, A., Andrade, M., Artíñano, B., Ausmeel, S., Arsov, T., Asmi, E., Backman, J., Baltensperger, U., Bastian, S., Bath, O., Beukes, J. P., Brem, B. T., Bukowiecki, N., Conil, S., Couret, C., Day, D., Dayantolis, W., Degorska, A., Eleftheriadis, K., Fetfatzis, P., Favez, O., Flentje, H., Gini, M. I., Gregorič, A., Gysel-Beer, M., Hallar, A. G., Hand, J., Hoffer, A., Hueglin, C., Hooda, R. K., Hyvärinen, A., Kalapov, I., Kalivitis, N., Kasper-Giebl, A., Kim, J. E., Kouvarakis, G., Kranjc, I., Krejci, R., Kulmala, M., Labuschagne, C., Lee, H.-J., Lihavainen, H., Lin, N.-H., Löschau, G., Luoma, K., Marinoni, A., Martins Dos Santos, S., Meinhardt, F., Merkel, M., Metzger, J.-M., Mihalopoulos, N., Nguyen, N. A., Ondracek, J., Pérez, N., Perrone, M. R., Petit, J.-E., Picard, D., Pichon, J.-M., Pont, V., Prats, N., Prenni, A., Reisen, F., Romano, S., Sellegri, K., Sharma, S., Schauer, G., Sheridan, P., Sherman, J. P., Schütze, M., Schwerin, A., Sohmer, R., Sorribas, M., Steinbacher, M., Sun, J., Titos, G., Toczko, B., Tuch, T., Tulet, P., Tunved, P., Vakkari, V., Velarde, F., Velasquez, P., Villani, P., Vratolis, S., Wang, S.-H., Weinhold, K., Weller, R., Yela, M., Yus-Diez, J., Zdimal, V., Zieger, P., and Zikova, N.: A global analysis of climate-relevant aerosol properties retrieved from the network of Global Atmosphere Watch (GAW) near-surface observatories, Atmos. Meas. Tech., 13(8), 4353–4392, doi:10.5194/amt-13-4353-2020, 2020.

Räsänen, M., Merbold, L., Vakkari, V., Aurela, M., Laakso, L., Beukes, J. P., Van Zyl, P. G., Josipovic, M., Feig, G., Pellikka, P., Rinne, J. and Katul, G. G.: Root-zone soil moisture variability across African savannas: From pulsed rainfall to land-cover switches, Ecohydrology, 13(5), e2213, doi:10.1002/eco.2213, 2020.

Vakkari, V., Beukes, J. P., Josipovic, M. and van Zyl, P. G.: Observations of ozone formation in southern African savanna and grassland fire plumes, Atmos. Environ., 223, 117256, doi:10.1016/j.atmosenv.2019.117256, 2020.

Venter, M., Beukes, J. P., van Zyl, P. G., Vakkari, V., Virkkula, A., Josipovic, M., Kulmala, M. and Laakso, L.: Six-year observations of aerosol optical properties at a southern African grassland savannah site, Atmos. Environ., 230, 117477, doi:10.1016/j.atmosenv.2020.117477, 2020.

15.5.2023

2019

Booyens, W., Van Zyl, G. P.,Beukes, P.J.,Ruiz-Jimenez, J., Kopperi, M., Riekkola, M.-L., Vakkari, V., Josipovic, M., Kulmala, M., Laakso, L, Characterising Particulate Organic Nitrogen at A Savannah-Grassland Region in South Africa, Atmosphere, p. 2073-4433, 10.3390/atmos10090492, 2019

Booyens, W., Beukes, J.P., Van Zyl, P.G. Ruiz-Jimenez, J., Kopperi, M., Riekkola, M.-L., Josipovic, M., Vakkari, V., Laakso, L., Assessment of polar organic aerosols at a regional background site in southern Africa, https://doi.org/10.1007/s10874-019-09389-y, J. Atmos Chem, 2019.

Vakkari, V., Manninen, A. J., O'Connor, E. J., Schween, J. H., van Zyl, P. G. and Marinou, E.: A novel post-processing algorithm for Halo Doppler lidars, Atmos. Meas. Tech., 12(2), 839–852, doi:10.5194/amt-12-839-2019, 2019.

2018

Gierens, R. T., Henriksson, S., Josipovic, M., Vakkari, V., van Zyl, P. G., Beukes, J. P., Wood, C. R. and O'Connor, E. J.: Observing continental boundary-layer structure and evolution over the South African savannah using a ceilometer, Theor. Appl. Climatol., 1–14, doi:10.1007/s00704-018-2484-7, 2018.

Jaars, K., Vestenius, M., van Zyl, P. G., Beukes, J. P., Hellén, H., Vakkari, V., Venter, M., Josipovic, M. and Hakola, H.: Receptor modelling and risk assessment of volatile organic compounds measured at a regional background site in South Africa, Atmos. Environ., 172, 133–148, doi:10.1016/j.atmosenv.2017.10.047, 2018.

Kollonige, D. E., Thompson, A. M., Josipovic, M., Tzortziou, M., Beukes, J. P., Burger, R., Martins, D. K., van Zyl, P. G., Vakkari, V. and Laakso, L.: OMI Satellite and Ground-Based Pandora Observations and Their Application to Surface NO2 Estimations at Terrestrial and Marine Sites, J. Geophys. Res. Atmos., doi:10.1002/2017JD026518, 2018.

Laban, T. L., van Zyl, P. G., Beukes, J. P., Vakkari, V., Jaars, K., Borduas-Dedekind, N., Josipovic, M., Thompson, A. M., Kulmala, M., and Laakso, L.: Seasonal influences on surface ozone variability in continental South Africa and implications for air quality, Atmos. Chem. Phys., 18, 15491-15514, https://doi.org/10.5194/acp-18-15491-2018, 2018.

Nieminen, T., Kerminen, V.-M., Petäjä, T., Aalto, P. P., Arshinov, M., Asmi, E., Baltensperger, U., Beddows, D. C. S., Beukes, J. P., Collins, D., Ding, A., Harrison, R. M., Henzing, B., Hooda, R., Hu, M., Hõrrak, U., Kivekäs, N., Komsaare, K., Krejci, R., Kristensson, A., Laakso, L., Laaksonen, A., Leaitch, W. R., Lihavainen, H., Mihalopoulos, N., Németh, Z., Nie, W., O'Dowd, C., Salma, I., Sellegri, K., Svenningsson, B., Swietlicki, E., Tunved, P., Ulevicius, V., Vakkari, V., Vana, M., Wiedensohler, A., Wu, Z., Virtanen, A., and Kulmala, M.: Global analysis of continental boundary layer new particle formation based on long-term measurements, Atmos. Chem. Phys., 18, 14737-14756, https://doi.org/10.5194/acp-18-14737-2018, 2018.

Vakkari, V., Beukes, J. P., Dal Maso, M., Aurela, M., Josipovic, M. and van Zyl, P. G.: Major secondary aerosol formation in southern African open biomass burning plumes, Nature Geosci., 11, 580¬–583, doi:10.1038/s41561-018-0170-0, 2018.

Venter, A.D., van Zyl, P.G. , Beukes, J.P. , Swartz, J--S., Josipovic, M., Vakkari, V., Laakso, L., Kulmala, M. Size-resolved characteristics of inorganic ionic species in atmospheric aerosols at a regional background site on the South African Highveld, Journal of Atmospheric Chemistry https://doi.org/10.1007/s10874-018-9378-z, 2018.

2017

Chiloane, K. E., Beukes, J. P., van Zyl, P. G., Maritz, P., Vakkari, V., Josipovic, M., Venter, A. D., Jaars, K., Tiitta, P., Kulmala, M., Wiedensohler, A., Liousse, C., Mkhatshwa, G. V., Ramandh, A. and Laakso, L.: Spatial, temporal and source contribution assessments of black carbon over the northern interior of South Africa, Atmos. Chem. Phys., 17(10), 6177–6196, doi:10.5194/acp-17-6177-2017, 2017.

Räsänen, M., Aurela, M., Vakkari, V., Beukes, J. P., Tuovinen, J.-P., Van Zyl, P. G., Josipovic, M., Venter, A. D., Jaars, K., Siebert, S. J., Laurila, T., Rinne, J., and Laakso, L.: Carbon balance of a grazed savanna grassland ecosystem in South Africa, Biogeosciences, 14, 1039-1054, doi:10.5194/bg-14-1039-2017, 2017.

Venter, A. D., van Zyl, P. G., Beukes, J. P., Josipovic, M., Hendriks, J., Vakkari, V., and Laakso, L.: Atmospheric trace metals measured at a regional background site (Welgegund) in South Africa, Atmos. Chem. Phys., 17, 4251-4263, doi:10.5194/acp-17-4251-2017, 2017

2016

Aurela, M., Beukes, J.P., Van Zyl, P.G., Vakkari, V., Teinilä, K., Saarikoski, S., Laakso, L. The composition of ambient and fresh biomass burning aerosols at a savannah site, South Africa, S Afr J Sci., 112, Art. #2015-0223, http://dx.doi.org/10.17159/sajs.2016/20150223, 2016

Butt, E. W., Rap, A., Schmidt, A., Scott, C. E., Pringle, K. J., Reddington, C. L., Richards, N. A. D., Woodhouse, M. T., Ramirez-Villegas, J., Yang, H., Vakkari, V., Stone, E. A., Rupakheti, M., S. Praveen, P., G. van Zyl, P., P. Beukes, J., Josipovic, M., Mitchell, E. J. S., Sallu, S. M., Forster, P. M. and Spracklen, D. V.: The impact of residential combustion emissions on atmospheric aerosol, human health, and climate, Atmos. Chem. Phys., 16(2), 873–905, doi:10.5194/acp-16-873-2016, 2016.

Jaars, K., van Zyl, P. G., Beukes, J. P., Hellén, H., Vakkari, V., Josipovic, M., Venter, A. D., Räsänen, M., Knoetze, L., Cilliers, D. P., Siebert, S. J., Kulmala, M., Rinne, J., Guenther, A., Laakso, L., and Hakola, H.: Measurements of biogenic volatile organic compounds at a grazed savannah grassland agricultural landscape in South Africa, Atmos. Chem. Phys., 16, 15665-15688, doi:10.5194/acp-16-15665-2016, 2016.

Mafusire, G., H. J. Annegarn, V. Vakkari, J. P. Beukes, M. Josipovic, P. G. van Zyl, and L. Laakso, Sub-micrometer aerosols and excess CO as tracers for biomass burning air mass transport over southern Africa, J. Geophys. Res. Atmos., 121, doi:10.1002/2015JD023965, 2016.

Venter, A. D., Beukes, J. P., Gideon van Zyl, P., Josipovic, M., Jaars, K. and Vakkari, V.: Regional atmospheric Cr(VI) pollution from the Bushveld Complex, South Africa, Atmos. Pollut. Res., 7(5), 762–767, doi:10.1016/j.apr.2016.03.009, 2016.

2015

Booyens, W., Van Zyl, PG., Beukes, JP., Ruiz-Jimenez, J., Kopperi, M., Riekkola, M-L., Josipovic, M., Venter, A., Jaars, K.,  Laakso, L.,  Vakkari, V., Kulmala, M., Pienaar, J.J. Size-resolved characterisation of organic compounds in atmospheric aerosols collected at Welgegund, South Africa, J. Atmos Chem., DOI 10.1007/s10874-015-9304-6, 2015

Kuik, F., Lauer, A., Beukes, J. P., Van Zyl, P. G., Josipovic, M., Vakkari, V., Laakso, L., and Feig, G. T.: The anthropogenic contribution to atmospheric black carbon concentrations in southern Africa: a WRF-Chem modeling study, Atmos. Chem. Phys., 15, 8809-8830, doi:10.5194/acp-15-8809-2015, 2015

Shrivastava, M., Easter, R., Liu, X., Zelenyuk, A., Singh, B., Zhang, K., Ma, P.-L., Chand, D., Ghan, S., Jimenez, J., Zhang, Q., Fast, J., Rasch, P., and Tiitta, P., Global transformation and fate of SOA: Implications of low-volatility SOA and gas-phase fragmentation reactions, Geophys. Res. Atmos., 120, 4169-4195. doi: 10.1002/2014JD022563, 2015

Vakkari, V., Tiitta, P., Jaars, K., Croteau, P., Beukes, J.P., Josipovic, M., Kerminen, V.-M., Kulmala, M., Venter, A.D., Van Zyl, P.G., Worsnop, D.R., Laakso, L., Reevaluating the contribution of sulfuric acid and the origin of organic compounds in atmospheric nanoparticle growth, Geophys. Res. Lett., 42, doi:10.1002/2015GL066459, 2015.

Venter, A.D., Jaars, K., Booyens, W., Beukes, J.P., Van Zyl, P.G., Josipovic, M., Hendriks, J., Vakkari, V., Hellén, H., Hakola, H., Aaltonen, H., Ruiz-Jimenez, J., Riekkola M-L., and Laakso, L.,  Plume characterisation of a typical South African braai, South African Journal of Chemistry,  68, 181–194, doi: 10.17159/0379-4350/2015/v68a25 , 2015.

2014

Backman, J., Virkkula, A., Vakkari, V., Beukes, J. P., Van Zyl, P. G., Josipovic, M., Piketh, S., Tiitta, P., Chiloane, K., Petäjä, T., Kulmala, M., and Laakso, L.: Differences in aerosol absorption Ångström exponents between correction algorithms for a particle soot absorption photometer measured on the South African Highveld, Atmos. Meas. Tech., 7, 4285-4298, doi:10.5194/amt-7-4285-2014, 2014

Gierens, R., Laakso, L., Mogense, D., Vakkari, V., Beukes, J.P., va Zyl, P.G., Hakola, H., Guenther, A., Pienaar, J.J., Boy, M., Modelling new particle formation events in the South African savannah, South African Journal of Science,110(5/6), Art. #2013-0108, http://dx.doi.org/10.1590/sajs.2014/20130108,  2014

Jaars, K., Beukes, J. P., van Zyl, P. G., Venter, A. D., Josipovic, M., Pienaar, J. J., Vakkari, V., Aaltonen, H., Laakso, H., Kulmala, M., Tiitta, P., Guenther, A., Hellén, H., Laakso, L., and Hakola, H.: Ambient aromatic hydrocarbon measurements at Welgegund, South Africa, Atmos. Chem. Phys., 14, 7075-7089, doi:10.5194/acp-14-7075-2014, 2014

Korhonen, K., Giannakaki, E., Mielonen, T., Pfüller, A., Laakso, L., Vakkari, V., Baars, H., Engelmann, R., Beukes, J. P., Van Zyl, P. G., Ramandh, A., Ntsangwane, L., Josipovic, M., Tiitta, P., Fourie, G., Ngwana, I., Chiloane, K., and Komppula, M.: Atmospheric boundary layer top height in South Africa: measurements with lidar and radiosonde compared to three atmospheric models, Atmos. Chem. Phys., 14, 4263-4278, doi:10.5194/acp-14-4263-2014, 2014

Tiitta, P., Vakkari, V., Croteau, P., Beukes, J. P., van Zyl, P. G., Josipovic, M., Venter, A. D., Jaars, K., Pienaar, J. J., Ng, N. L., Canagaratna, M. R., Jayne, J. T., Kerminen, V.-M., Kokkola, H., Kulmala, M., Laaksonen, A., Worsnop, D. R., and Laakso, L.: Chemical composition, main sources and temporal variability of PM1 aerosols in southern African grassland, Atmos. Chem. Phys., 14, 1909-1927, doi:10.5194/acp-14-1909-2014, 2014.

Vakkari, V., Kerminen, V.-M., Beukes, J.P.,  Tiitta, P., van Zyl, P.G., Josipovic, M., Venter, A., Jaars, K., Worsnop, D., Kulmala, M., and Laakso, L., Rapid changes in biomass burning aerosols by atmospheric oxidation, Geophys. Res. Lett., 41, doi:10.1002/2014GL059396, 2014

Van Zyl PG, Beukes JP, Du Toit G, Mabaso D, Hendriks J, Vakkari V., Tiitta, P., Pienaar, J.J., Kulmala, M., Laakso, L.. Assessment of atmospheric trace metals in the western Bushveld Igneous Complex, South Africa. S Afr J Sci. 110(3/4), Art. #2013-0280, http://dx.doi.org/10.1590/sajs.2014/20130280, 2014

2013

Hirsikko, A., Vakkari, V., Tiitta, P., Hatakka, J., Kerminen, V.-M., Sundström, A.-M., Beukes, J. P., Manninen, H. E., Kulmala, M., and Laakso, L.: Multiple daytime nucleation events in semi-clean savannah and industrial environments in South Africa: analysis based on observations, Atmos. Chem. Phys., 13, 5523-5532, doi:10.5194/acp-13-5523-2013, 2013

Hyvärinen, A.-P., Vakkari, V., Laakso, L., Hooda, R. K., Sharma, V. P., Panwar, T. S., Beukes, J. P., van Zyl, P. G., Josipovic, M., Garland, R. M., Andreae, M. O., Pöschl, U., and Petzold, A.: Correction for a measurement artifact of the Multi-Angle Absorption Photometer (MAAP) at high black carbon mass concentration levels, Atmos. Meas. Tech., 6, 81-90, doi:10.5194/amt-6-81-2013, 2013

Laakso, L., Merikanto, J., Vakkari, V., Laakso, H., Kulmala, M., Molefe, M., Kgabi, N., Mabaso, D., Carslaw, K. S., Spracklen, D. V., Lee, L. A., Reddington, C. L., and Kerminen, V.-M.: Boundary layer nucleation as a source of new CCN in savannah environment, Atmos. Chem. Phys., 13, 1957-1972, doi:10.5194/acp-13-1957-2013, 2013

Paasonen,P., Asmi, A., Petäjä, T., Kajos, M. K., Äijälä, M., Junninen, H., Holst, T., Abbatt, J.P.D., Arneth, A., Birmili, W., van der Gon, H.D., Hamed, A., Hoffer, A., Laakso, L., Laaksonen, A., Leaitch, W.R., Plass-Dülmer, C. Pryor, S.C., Räisänen, P., Swietlicki, E., Wiedensohler, A., Worsnop, D.R., Kerminen, V.-M. and Kulmala, M., Warming-induced increase in aerosol number concentration likely to moderate climate change, Nature Geoscience, doi:10.1038/ngeo1800, 2013

Petäjä, T., Vakkari, V., Pohja, T., Nieminen, T., Laakso, H., Aalto, P.P., Keronen, P., Siivola, E., Kerminen, V.-M., Kulmala, M., Laakso, L., Transportable Aerosol Characterization Trailer with Trace Gas Chemistry: Design, Instruments and Verification, Aerosol and Air Quality Research, 13: 421–435, 2013

Vakkari, V., Beukes, J. P., Laakso, H., Mabaso, D., Pienaar, J. J., Kulmala, M., and Laakso, L.: Long-term observations of aerosol size distributions in semi-clean and polluted savannah in South Africa, Atmos. Chem. Phys., 13, 1751-1770, doi:10.5194/acp-13-1751-2013, 2013

2012

Hirsikko, A., Vakkari, V., Tiitta, P., Manninen, H. E., Gagné, S., Laakso, H., Kulmala, M., Mirme, A., Mirme, S., Mabaso, D., Beukes, J. P., and Laakso, L., Characterisation of sub-micron particle number concentrations and formation events in the western Bushveld Igneous Complex, South Africa, Atmos. Chem. Phys., 12, 3951-3967, doi:10.5194/acp-12-3951-2012, 2012

Kerminen, V.-M., Paramonov, M., Anttila, T., Riipinen, I., Fountoukis, C., Korhonen, H., Asmi, E., Laakso, L., Lihavainen, H., Swietlicki, E., Svenningsson, B., Asmi, A., Pandis, S. N., Kulmala, M., and Petäjä, T.: Cloud condensation nuclei production associated with atmospheric nucleation: a synthesis based on existing literature and new results, Atmos. Chem. Phys., 12, 12037-12059, doi:10.5194/acp-12-12037-2012, 2012.

Laakso, L., Vakkari, V., Virkkula, A., Laakso, H., Backman, J., Kulmala, M., Beukes, J. P., van Zyl, P. G., Tiitta, P., Josipovic, M., Pienaar, J. J., Chiloane, K., Gilardoni, S., Vignati, E., Wiedensohler, A., Tuch, T., Birmili, W., Piketh, S., Collett, K., Fourie, G. D., Komppula, M., Lihavainen, H., de Leeuw, G., and Kerminen, V.-M.,  South African EUCAARI measurements: seasonal variation of trace gases and aerosol optical properties, Atmos. Chem. Phys., 12, 1847-1864, doi:10.5194/acp-12-1847-2012, 2012

Venter, A.D., Vakkari,V., Beukes, J.P., van Zyl, P.G., Laakso, H., Mabaso, D., Tiitta, P., Josipovic, M., Kulmala, M., Pienaar, J.J., Laakso, L., An air quality assessment in the industrialised western Bushveld Igneous Complex, South Africa, South African Journal of Science, 108, No 9/10, 2012

2011

Hirsikko, A., Nieminen, T., Gagné, S., Lehtipalo, K., Manninen, H. E., Ehn, M., Hõrrak, U., Kerminen, V.-M., Laakso, L., McMurry, P. H., Mirme, A., Mirme, S., Petäjä, T., Tammet, H., Vakkari, V., Vana, M., and Kulmala, M: , Atmospheric small ions: A review of observations, Atmos. Chem. Phys., 11, 767-798, doi:10.5194/acp-11-767-2011, 2011

Kulmala, M., Asmi, A., Lappalainen, H. K., Baltensperger, U., Brenguier, J.-L., Facchini, M. C., Hansson, H.-C., Hov, Ø., O'Dowd, C. D., Pöschl, U., Wiedensohler, A., Boers, R., Boucher, O., de Leeuw, G., Denier van der Gon, H. A. C., Feichter, J., Krejci, R., Laj, P., Lihavainen, H., Lohmann, U., McFiggans, G., Mentel, T., Pilinis, C., Riipinen, I., Schulz, M., Stohl, A., Swietlicki, E., Vignati, E., Alves, C., Amann, M., Ammann, M., Arabas, S., Artaxo, P., Baars, H., Beddows, D. C. S., Bergström, R., Beukes, J. P., Bilde, M., Burkhart, J. F., Canonaco, F., Clegg, S. L., Coe, H., Crumeyrolle, S., D'Anna, B., Decesari, S., Gilardoni, S., Fischer, M., Fjaeraa, A. M., Fountoukis, C., George, C., Gomes, L., Halloran, P., Hamburger, T., Harrison, R. M., Herrmann, H., Hoffmann, T., Hoose, C., Hu, M., Hyvärinen, A., Hõrrak, U., Iinuma, Y., Iversen, T., Josipovic, M., Kanakidou, M., Kiendler-Scharr, A., Kirkevåg, A., Kiss, G., Klimont, Z., Kolmonen, P., Komppula, M., Kristjánsson, J.-E., Laakso, L., Laaksonen, A., Labonnote, L., Lanz, V. A., Lehtinen, K. E. J., Rizzo, L. V., Makkonen, R., Manninen, H. E., McMeeking, G., Merikanto, J., Minikin, A., Mirme, S., Morgan, W. T., Nemitz, E., O'Donnell, D., Panwar, T. S., Pawlowska, H., Petzold, A., Pienaar, J. J., Pio, C., Plass-Duelmer, C., Prévôt, A. S. H., Pryor, S., Reddington, C. L., Roberts, G., Rosenfeld, D., Schwarz, J., Seland, Ø., Sellegri, K., Shen, X. J., Shiraiwa, M., Siebert, H., Sierau, B., Simpson, D., Sun, J. Y., Topping, D., Tunved, P., Vaattovaara, P., Vakkari, V., Veefkind, J. P., Visschedijk, A., Vuollekoski, H., Vuolo, R., Wehner, B., Wildt, J., Woodward, S., Worsnop, D. R., van Zadelhoff, G.-J., Zardini, A. A., Zhang, K., van Zyl, P. G., Kerminen, V.-M., S Carslaw, K., and Pandis, S. N.: General overview: European Integrated project on Aerosol Cloud Climate and Air Quality interactions (EUCAARI) – integrating aerosol research from nano to global scales, Atmos. Chem. Phys., 11, 13061-13143, doi:10.5194/acp-11-13061-2011, 2011.

Vakkari, V., Laakso, H., Kulmala, M., Laaksonen, A., Mabaso, D., Molefe, M., Kgabi, N. and Laakso, L., New particle formation events in semi-clean South African savannah, Atmos. Chem. Phys., 11, 3333-3346, 2011.

2010 - 2009

Kerminen, V.-M., Petäjä, T., Manninen, H. E., Paasonen, P., Nieminen, T., Sipilä, M., Junninen, H., Ehn, M., Gagné, S., Laakso, L., Riipinen, I., Vehkamäki, H., Kurten, T., Ortega, I. K., Dal Maso, M., Brus, D., Hyvärinen, A., Lihavainen, H., Leppä, J., Lehtinen, K. E. J., Mirme, A., Mirme, S., Hõrrak, U., Berndt, T., Stratmann, F., Birmili, W., Wiedensohler, A., Metzger, A., Dommen, J., Baltensperger, U., Kiendler-Scharr, A., Mentel, T. F., Wildt, J., Winkler, P. M., Wagner, P. E., Petzold, A., Minikin, A., Plass-Dülmer, C., Pöschl, U., Laaksonen, A., and Kulmala, M.: Atmospheric nucleation: highlights of the EUCAARI project and future directions, Atmos. Chem. Phys., 10, 10829-10848, doi:10.5194/acp-10-10829-2010, 2010

Spracklen, D. V. , K. S. Carslaw, J. Merikanto, G. W. Mann, S. Pickering, J. A. Ogren, E. Andrews, U. Baltensperger, E. Weingartner, M. Boy, M. Kulmala, L. Laakso, H. Lihavainen, N. Kivekäs, N. Mihalopoulos, G. Kouvarakis, S. G. Jennings, W. Birmili, A. Wiedensohler, R. Weller, P. Laj, K. Sellegri, B. Bonn, and R. Krejci, Explaining global surface aerosol number concentrations in terms of primary emissions and particle formation, Atmos. Chem. Phys., 10, 4775-4793, doi:10.5194/acp-10-4775-2010, 2010

2008

Laakso, L.,  H. Laakso, P.P. Aalto, P. Keronen, T. Petäjä, T. Nieminen, T. Pohja, E. Siivola, M. Kulmala, N. Kgabi, D. Phalatse, M. Molefe, D. Mabaso, K. Pienaar, V.-M. Kerminen," Basic characteristics of atmospheric particles, trace gases and meteorology in a relatively clean Southern African Savannah environment", Atmos. Chem. Phys., 8, 4823-4839, doi:10.5194/acp-8-4823-2008, 2008

2006

Laakso, L.,  I.K. Koponen, P. Mönkkönen and M. Kulmala, Veli-Matti Kerminen, Birgit Wehner, Alfred Wiedensohler, Zhijun Wu, Min Hu, "Aerosol particles in the developing world; a comparison between New Delhi in India and Beijing in China", Water, Air and Soil Pollution, pages 5-20, DOI 10.1007/s11270-005-9018-5, 2006

Thesis

PhD

Kok, L., Factors governing rain chemistry and wet deposition at a regional background site in South Africa, 2020 Venter, M., Aerosol optical properties at a savannah grassland site in South Africa, 2020 Chiloane, E.K., Spatial, temporal and source contribution assessments of aerosol black carbon over the northern interior of South Africa, 2019

Laban, T., Factors influencing surface ozone variability over continental South Africa and implications for air quality and agriculture, North-West University, Republic of South Africa, 2018 Booyens, W., Measurement of organic compounds in atmospheric aerosols collected at Welgegund, South Africa, PhD-thesis, North-West University, Republic of South Africa, 2018 Jaars, K., Volatile organic compound measurements at a grazed savannah grassland in South Africa, PhD-thesis, North-West University, Republic of South Africa, 2017 Venter, A.D., Assessment of atmospheric trace metals and water soluble ionic species at two regional background sites, PhD-thesis, North-West University, Republic of South Africa, 2017

Vakkari, V., On the sources of submicron aerosol particles in savannah: implications for climate and air quality, PhD-thesis, University of Helsinki, Finland, 2013

MSc

Ngoasheng, M., Assessing atmospheric trace gas concentrations in rural areas of the North West Province, 2020 van Loggenberg, E., Applicability of analytical techniques to quantify trace metals in particulate matter for source apportionment in South Africa, 2020 Stenden, F.H., Atmospheric SO2 and NO2 flux measurements at a savannah-grassland-agriculture landscape in South Africa, 2019 Kok, L., Wet deposition at a regional background site in South Africa – influence of air mass origin and rain intensity on chemical composition, MSc-thesis, North-West University, Republic of South Africa, 2017 Dunn, M., Characterisation of air masses passing over the Vredefort Dome world heritage site, MSc-thesis, North-West University, Republic of South Africa, 2016

Gierens, R., Understanding the evolution of the boundary layer over the Highveld, South Africa, MSc-thesis, University of Helsinki, Finland, 2015

Jaars, K., Temporal assessment of volatile organic compounds at a site with high atmospheric variability in the North-West Province, MSc-thesis, North-West University, Republic of South Africa, 2013

Venter, A. Air quality assessment of the industrialized western Bushveld Igneous Complex, MSc-thesis, North-West University, Republic of South Africa, 2012

Engelbrecht, W., "Characterization of organic compounds in atmospheric aerosols utilizing 2D gas chromatography and mass spectrometry", MSc-thesis, North-West University, Republic of South Africa, 2009

Vakkari, V., "Aerosol particles in a semi-clean savannah environment", MSc-thesis, University of Helsinki, Finland, 2009

Honns. BSc

Swartz, J.-S. Temporal assessment of anion and cation chemical species in atmospheric aerosols collected in the western Bushveld Igneous Complex, Honns. BSc-thesis, North-West University, Republic of South Africa, 2012

du Preez, C.,  "Characterization of ion species and trace metals in aerosol samples collected near Potchefstroom", Honns. BSc-thesis, North-West University, Republic of South Africa, 2010

Venter, A., "Evaluation of passive samplers for the measurements of inorganic gaseous species", Honns. BSc-thesis, North-West University, Republic of South Africa, 2009

Book chapters  (refereed)

2015

Beukes, J.P., Venter, A.D., Josipovic, M., Van Zyl, P.G, Vakkari, V., Jaars, K., Dunn, M. and Laakso,L. "Chapter 6 – Automated Continuous Air Monitoring" in  "Monitoring of Air Pollutants — Sampling, Sample Preparation and Analytical Techniques", edited by Patricia B.C. Forbes, Comprehensive Analytical Chemistry, Vol. 70, p. 183–208, 2015

2013

Laakso, L., Beukes, J.P., Van Zyl, P.G., Pienaar, J.J., Josipovic, M., Venter, A., Jaars, K., Vakkari, V., Labuschagne, C., Chiloane, K., Tuovinen, J.-P., Chapter 20 - Ozone Concentrations and Their Potential Impacts on Vegetation in Southern Africa, In: R. Matyssek, N. Clarke, P. Cudlin, T.N. Mikkelsen, J.-P. Tuovinen, G. Wieser and E. Paoletti, Editor(s), Developments in Environmental Science, Elsevier, Volume 13, Pages 429-450, ISSN 1474-8177, ISBN 9780080983493, 2013

2011

Laakso, L. and Pienaar, J.J., Chapter "Air pollution and the interactions between atmosphere, biosphere and the anthroposphere" in "Earth Observation and Environmental Change in South Africa", eds. Dr Johan Pauw, J., van Jaarsveld, A., Wessels, K. and Zietsman, L., 8 pages, in print, 2011.

Appearances in media

Beukes, J.P., Vakkari, V., van Zyl, P., Venter, A., Josipovic, M., Jaars, K., Tiitta, P., Siebert, S.,  Pienaar, J.J.,   Kulmala, M., and Laakso, L., "Welgegund - long-term land-atmosphere measurement platform in South Africa", Ileaps Newsletter #12, September 2012.

Laakso, L., Beukes, J.P., Van Zyl, P.G., Pienaar, J.J., Vakkari, V., Kulmala, M. New Southern African Supersite for Atmospheric Observations, MEGAPOLI-NL11-11-06, 2011

Yliopistolehti, "Johannesburgin tuulet", 2011/01

Laakso, L and Suni, T.,  " Suomalaisia aerosolimittauksia maailmalla – miksi ja kenen rahalla? Ilmansuojelulehti 2/2007

Helsingin Sanomat, "Suomalainen vaunu nuuskii savannin ilmaa", HS - Tiede & Luonto - 17.4.2007