Zobrazeno 1 - 10
of 59
pro vyhledávání: '"K Jaars"'
Autor:
T. L. Laban, P. G. van Zyl, J. P. Beukes, V. Vakkari, K. Jaars, N. Borduas-Dedekind, M. Josipovic, A. M. Thompson, M. Kulmala, L. Laakso
Publikováno v:
Atmospheric Chemistry and Physics, Vol 18, Pp 15491-15514 (2018)
Although elevated surface ozone (O3) concentrations are observed in many areas within southern Africa, few studies have investigated the regional atmospheric chemistry and dominant atmospheric processes driving surface O3 formation in this region.
Externí odkaz:
https://doaj.org/article/b8c33b7bfe32425896b6b9d4c395789e
Autor:
K. E. Chiloane, J. P. Beukes, P. G. van Zyl, P. Maritz, V. Vakkari, M. Josipovic, A. D. Venter, K. Jaars, P. Tiitta, M. Kulmala, A. Wiedensohler, C. Liousse, G. V. Mkhatshwa, A. Ramandh, L. Laakso
Publikováno v:
Atmospheric Chemistry and Physics, Vol 17, Iss 10, Pp 6177-6196 (2017)
After carbon dioxide (CO2), aerosol black carbon (BC) is considered to be the second most important contributor to global warming. This paper presents equivalent black carbon (eBC) (derived from an optical absorption method) data collected from three
Externí odkaz:
https://doaj.org/article/2a5930b104734b2ea9d6db9362801fb5
Autor:
M. Räsänen, M. Aurela, V. Vakkari, J. P. Beukes, J.-P. Tuovinen, P. G. Van Zyl, M. Josipovic, A. D. Venter, K. Jaars, S. J. Siebert, T. Laurila, J. Rinne, L. Laakso
Publikováno v:
Biogeosciences, Vol 14, Iss 5, Pp 1039-1054 (2017)
Tropical savannas and grasslands are estimated to contribute significantly to the total primary production of all terrestrial vegetation. Large parts of African savannas and grasslands are used for agriculture and cattle grazing, but the carbon flux
Externí odkaz:
https://doaj.org/article/25dc01972d0445ea9372eed75ebc282c
Publikováno v:
Atmospheric Chemistry and Physics, Vol 17, Iss 5, Pp 3357-3370 (2017)
We present spring and summer volatile organic compound (VOC) emission rate measurements from Norway spruce (Picea abies L. Karst) growing in a boreal forest in southern Finland. The measurements were conducted using in situ gas chromatograph with 1 t
Externí odkaz:
https://doaj.org/article/e23c2fcd291441078537ebce4becff23
Autor:
K. Jaars, P. G. van Zyl, J. P. Beukes, H. Hellén, V. Vakkari, M. Josipovic, A. D. Venter, M. Räsänen, L. Knoetze, D. P. Cilliers, S. J. Siebert, M. Kulmala, J. Rinne, A. Guenther, L. Laakso, H. Hakola
Publikováno v:
Atmospheric Chemistry and Physics, Vol 16, Pp 15665-15688 (2016)
Biogenic volatile organic compounds (BVOCs) play an important role in the chemistry of the troposphere, especially in the formation of tropospheric ozone (O3) and secondary organic aerosols (SOA). Ecosystems produce and emit a large number of BVOC
Externí odkaz:
https://doaj.org/article/dc37818828d449aeb3535639b7118b0b
Autor:
K.E Chiloane, J.P Beukes, P.G van Zyl, P Maritz, V Vakkari, M Josipovic, A.D Venter, K Jaars, P Tiitta, M Kulmala, A Wiedensohler, C Liousse, G.V Mkhatshwa, A Ramandh, L Laakso
Publikováno v:
Clean Air Journal, Vol 27, Iss 2 (2017)
Externí odkaz:
https://doaj.org/article/482d9a8afa51425389932d0ef5a0c043
Autor:
A.-M. Sundström, A. Nikandrova, K. Atlaskina, T. Nieminen, V. Vakkari, L. Laakso, J. P. Beukes, A. Arola, P. G. van Zyl, M. Josipovic, A. D. Venter, K. Jaars, J. J. Pienaar, S. Piketh, A. Wiedensohler, E. K. Chiloane, G. de Leeuw, M. Kulmala
Publikováno v:
Atmospheric Chemistry and Physics, Vol 15, Iss 9, Pp 4983-4996 (2015)
Proxies for estimating nucleation mode number concentrations and further simplification for their use with satellite data have been presented in Kulmala et al. (2011). In this paper we discuss the underlying assumptions for these simplifications and
Externí odkaz:
https://doaj.org/article/6cb904cfb1994cffbe7ecae4871aa2ec
Autor:
K. Jaars, J. P. Beukes, P. G. van Zyl, A. D. Venter, M. Josipovic, J. J. Pienaar, V. Vakkari, H. Aaltonen, H. Laakso, M. Kulmala, P. Tiitta, A. Guenther, H. Hellén, L. Laakso, H. Hakola
Publikováno v:
Atmospheric Chemistry and Physics, Vol 14, Iss 13, Pp 7075-7089 (2014)
Aromatic hydrocarbons are associated with direct adverse human health effects and can have negative impacts on ecosystems due to their toxicity, as well as indirect negative effects through the formation of tropospheric ozone and secondary organic ae
Externí odkaz:
https://doaj.org/article/bef02ce7e9334208a49e3a591fb8335a
Autor:
P. Tiitta, V. Vakkari, P. Croteau, J. P. Beukes, P. G. van Zyl, M. Josipovic, A. D. Venter, K. Jaars, J. J. Pienaar, N. L. Ng, M. R. Canagaratna, J. T. Jayne, V.-M. Kerminen, H. Kokkola, M. Kulmala, A. Laaksonen, D. R. Worsnop, L. Laakso
Publikováno v:
Atmospheric Chemistry and Physics, Vol 14, Iss 4, Pp 1909-1927 (2014)
Southern Africa is a significant source region of atmospheric pollution, yet long-term data on pollutant concentrations and properties from this region are rather limited. A recently established atmospheric measurement station in South Africa, Welgeg
Externí odkaz:
https://doaj.org/article/64db2d83f8144f1dbaf5254c7b0b46c0
Autor:
J.P Beukes, V Vakkari, P.G van Zyl, A.D Venter, M Josipovic, K Jaars, P Tiitta, M Kulmala, D Worsnop, J.J Pienaar, A Virkkula, L Laakso
Publikováno v:
Clean Air Journal, Vol 23, Iss 1 (2013)
Externí odkaz:
https://doaj.org/article/f589bc31eec84f03aadd50ca6bf3f5e9