Výsledky vyhledávání - "Heikki Laakso"

Akademický článek

An air quality assessment in the industrialised western Bushveld Igneous Complex, South Africa

Autor: Andrew Venter, Ville Vakkar, Johan Beukes, Pieter van Zyl, Heikki Laakso, Desmond Mabaso, Petri Tiitta, Miroslav Josipovic, Markku Kulmala, Jacobus Pienaar, Lauri Laakso

Publikováno v: South African Journal of Science, Vol 108, Iss 9/10 (2012)

South Africa has the largest industrialised economy in Africa, with significant mining and metallurgical activities. A large fraction of the South African mineral assets is concentrated in the Bushveld Igneous Complex (BIC), with the western limb bei

Externí odkaz: https://doaj.org/article/0d8d0df31e274cad9c0b5b189913e7fc

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Carbon dioxide and energy fluxes over a small boreal lake in Southern Finland

Autor: Ivan Mammarella, Timo Vesala, Jouni Heiskanen, Sami Haapanala, Üllar Rannik, Jukka Pumpanen, Janne Levula, Annika Nordbo, Heikki Laakso, Olli Peltola, Anne Ojala

Publikováno v: Journal of Geophysical Research: Biogeosciences. 120:1296-1314

Dynamics of carbon dioxide and energy exchange over a small boreal lake were investigated. Flux measurements have been carried out by the eddy covariance technique during two open-water periods (June–October) at Lake Kuivajarvi in Finland. Sensible

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4978c362cd3af64ada20ea014872a058
https://doi.org/10.1002/2014jg002873

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

Autor: Dominick V. Spracklen, D. Mabaso, Lindsay Lee, Markku Kulmala, M. Molefe, Carly Reddington, Heikki Laakso, Kenneth S. Carslaw, Lauri Laakso, Nnenesi A. Kgabi, Ville Vakkari, Joonas Merikanto, V.-M. Kerminen

Publikováno v: Atmospheric Chemistry and Physics, Vol 13, Iss 4, Pp 1957-1972 (2013)
Atmospheric Chemistry and Physics

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 observations means that the knowle

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6262a9bde827c9f548b789bb2883bdc5
https://doi.org/10.5194/acp-13-1957-2013

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Transportable Aerosol Characterization Trailer with Trace Gas Chemistry: Design, Instruments and Verification

Autor: Petri Keronen, Heikki Laakso, Erkki Siivola, Tuomo Nieminen, P. P. Aalto, V. M. Kerminen, Markku Kulmala, Ville Vakkari, Tuukka Petäjä, Lauri Laakso, Toivo Pohja

Publikováno v: Aerosol and Air Quality Research

The characterization of atmospheric aerosol properties and trace gas concentrations in various environments provides a basis for scientific research on the assessment of their roles in the climate system, as well as regional air quality issues. Howev

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7119f52989ff208adfd5191edd2fb900
https://doi.org/10.4209/aaqr.2012.08.0207

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Respiration in Boreal Forest Soil as Determined from Carbon Dioxide Concentration Profile

Autor: Hannu Ilvesniemi, Pertti Hari, Mikko Laakso, Jukka Pumpanen, Maria Uusimaa, Erkki Siivola, Pasi Kolari, Liisa Kulmala, Christer Helenelund, Heikki Laakso

Publikováno v: Soil Science Society of America Journal. 72:1187-1196

Soil respiration forms a substantial part of the ecosystem respiration. However, the respiration measurements conducted with chambers on the soil surface do not give information on the vertical distribution of CO 2 sources and its seasonal dynamics.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::69ba0cde3f740ed098e1785f83af7f9a
https://doi.org/10.2136/sssaj2007.0199

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Basic characteristics of atmospheric particles, trace gases and meteorology in a relatively clean Southern African Savannah environment

Autor: D. Phalatse, Heikki Laakso, Tuomo Nieminen, D. Mabaso, Erkki Siivola, K. Pienaar, Markku Kulmala, M. Molefe, V.-M. Kerminen, Nnenesi A. Kgabi, Petri Keronen, Tuukka Petäjä, Lauri Laakso, Toivo Pohja, Pasi Aalto

Publikováno v: Atmospheric Chemistry and Physics. 8:4823-4839

We have analyzed one year (July 2006–July 2007) of measurement data from a relatively clean background site located in dry savannah in South Africa. The annual-median trace gas concentrations were equal to 0.7 ppb for SO2, 1.4 ppb for NOx, 36 ppb f

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9c11c938061a4d495c1b77db48546b88
https://doi.org/10.5194/acp-8-4823-2008

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Ambient aromatic hydrocarbon measurements at Welgegund, South Africa

Autor: Hermanni Aaltonen, Ville Vakkari, Kerneels Jaars, Markku Kulmala, Hannele Hakola, Heidi Hellén, Miroslav Josipovic, A. D. Venter, Johan P. Beukes, P. G. van Zyl, Heikki Laakso, Jacobus J. Pienaar, Alex Guenther, Petri Tiitta, Lauri Laakso

Publikováno v: Jaars, K; Beukes, JP; van Zyl, PG; Venter, AD; Josipovic, M; Pienaar, JJ; et al.(2014). Ambient aromatic hydrocarbon measurements at Welgegund, South Africa. ATMOSPHERIC CHEMISTRY AND PHYSICS, 14(13), 7075-7089. doi: 10.5194/acp-14-7075-2014. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/3478j7qk
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://explore.openaire.eu/search/publication?articleId=doi_dedup___::b18bbd068aaba3f6f7e216ad214178b2
http://www.escholarship.org/uc/item/3478j7qk

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

Autor: Markku Kulmala, Lauri Laakso, Jacobus J. Pienaar, D. Mabaso, Ville Vakkari, Johan P. Beukes, Heikki Laakso

Publikováno v: Atmospheric Chemistry and Physics Discussions
Atmospheric Chemistry and Physics, Vol 13, Iss 4, Pp 1751-1770 (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 size range below 100 nm. Du

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5892f49a698c2b38a8b359b9e0f845fe

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An air quality assessment in the industrialised western Bushveld Igneous Complex, South Africa

Autor: Markku Kulmala, Johan P. Beukes, Miroslav Josipovic, A. D. Venter, Pieter G. van Zyl, Jacobus J. Pienaar, Lauri Laakso, Heikki Laakso, Petri Tiitta, D. Mabaso, Ville Vakkari

Publikováno v: South African Journal of Science, Vol 108, Iss 9/10 (2012)
South African Journal of Science, Volume: 108, Issue: 9-10, Pages: 1-10, Published: 2012

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7ad85f43a7de913bb33b0c57240774f4
https://www.sajs.co.za/article/view/9633

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New particle formation events in semi-clean South African savannah

Autor: Markku Kulmala, Heikki Laakso, Nnenesi A. Kgabi, D. Mabaso, M. Molefe, Ari Laaksonen, Lauri Laakso, Ville Vakkari

Publikováno v: Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics, Vol 11, Iss 7, Pp 3333-3346 (2011)

This study is based on 18 months (20 July 2006–5 February 2008) of continuous measurements of aerosol particle size distributions, air ion size distributions, trace gas concentrations and basic meteorology in a semi-clean savannah environment in Re

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a7124e3d3659131075b1533ae1ab0b09

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