Overview of the international project on biogenic aerosol formation in the boreal forest (BIOFOR)
Aerosol formation and subsequent particle growth in ambient air have been frequently observed at a boreal forest site (SMEAR II station) in Southern Finland. The EU funded project BIOFOR (Biogenic aerosol formation in the boreal forest) has focused on: (a) determination of formation mechanisms of ae...
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ftleibnizopen:oai:oai.leibnizopen.de:pHbfXIkBdbrxVwz6fwQW 2023-07-30T04:02:05+02:00 Overview of the international project on biogenic aerosol formation in the boreal forest (BIOFOR) Kulmala, M. Hämeri, K. Aalto, P.P. Mäkelä, J.M. Pirjola, L. Nilsson, E. Douglas Buzorius, G. Rannik, Ü. Dal Maso, M. Seidl, W. Hoffman, T. Janson, R. Hansson, H.-C. Viisanen, Y. Laaksonen, A. O’dowd, C.D. 2001 application/pdf https://doi.org/10.34657/1185 https://oa.tib.eu/renate/handle/123456789/594 eng eng Milton Park : Taylor & Francis CC BY 4.0 Unported https://creativecommons.org/licenses/by/4.0/ Tellus B: Chemical and Physical Meteorology, Volume 53, Issue 4, Page 324-343 aerosol formation biogenic material boreal forest volatile organic compound 550 article Text 2001 ftleibnizopen https://doi.org/10.34657/1185 2023-07-16T23:25:30Z Aerosol formation and subsequent particle growth in ambient air have been frequently observed at a boreal forest site (SMEAR II station) in Southern Finland. The EU funded project BIOFOR (Biogenic aerosol formation in the boreal forest) has focused on: (a) determination of formation mechanisms of aerosol particles in the boreal forest site; (b) verification of emissions of secondary organic aerosols from the boreal forest site; and (c) quantification of the amount of condensable vapours produced in photochemical reactions of biogenic volatile organic compounds (BVOC) leading to aerosol formation. The approach of the project was to combine the continuous measurements with a number of intensive field studies. These field studies were organised in three periods, two of which were during the most intense particle production season and one during a non-event season. Although the exact formation route for 3 nm particles remains unclear, the results can be summarised as follows: Nucleation was always connected to Arctic or Polar air advecting over the site, giving conditions for a stable nocturnal boundary layer followed by a rapid formation and growth of a turbulent convective mixed layer closely followed by formation of new particles. The nucleation seems to occur in the mixed layer or entrainment zone. However two more prerequisites seem to be necessary. A certain threshold of high enough sulphuric acid and ammonia concentrations is probably needed as the number of newly formed particles was correlated with the product of the sulphuric acid production and the ammonia concentrations. No such correlation was found with the oxidation products of terpenes. The condensation sink, i.e., effective particle area, is probably of importance as no nucleation was observed at high values of the condensation sink. From measurement of the hygroscopic properties of the nucleation particles it was found that inorganic compounds and hygroscopic organic compounds contributed both to the particle growth during daytime while at night ... Article in Journal/Newspaper Arctic LeibnizOpen (The Leibniz Association) Arctic |
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Open Polar |
collection |
LeibnizOpen (The Leibniz Association) |
op_collection_id |
ftleibnizopen |
language |
English |
topic |
aerosol formation biogenic material boreal forest volatile organic compound 550 |
spellingShingle |
aerosol formation biogenic material boreal forest volatile organic compound 550 Kulmala, M. Hämeri, K. Aalto, P.P. Mäkelä, J.M. Pirjola, L. Nilsson, E. Douglas Buzorius, G. Rannik, Ü. Dal Maso, M. Seidl, W. Hoffman, T. Janson, R. Hansson, H.-C. Viisanen, Y. Laaksonen, A. O’dowd, C.D. Overview of the international project on biogenic aerosol formation in the boreal forest (BIOFOR) |
topic_facet |
aerosol formation biogenic material boreal forest volatile organic compound 550 |
description |
Aerosol formation and subsequent particle growth in ambient air have been frequently observed at a boreal forest site (SMEAR II station) in Southern Finland. The EU funded project BIOFOR (Biogenic aerosol formation in the boreal forest) has focused on: (a) determination of formation mechanisms of aerosol particles in the boreal forest site; (b) verification of emissions of secondary organic aerosols from the boreal forest site; and (c) quantification of the amount of condensable vapours produced in photochemical reactions of biogenic volatile organic compounds (BVOC) leading to aerosol formation. The approach of the project was to combine the continuous measurements with a number of intensive field studies. These field studies were organised in three periods, two of which were during the most intense particle production season and one during a non-event season. Although the exact formation route for 3 nm particles remains unclear, the results can be summarised as follows: Nucleation was always connected to Arctic or Polar air advecting over the site, giving conditions for a stable nocturnal boundary layer followed by a rapid formation and growth of a turbulent convective mixed layer closely followed by formation of new particles. The nucleation seems to occur in the mixed layer or entrainment zone. However two more prerequisites seem to be necessary. A certain threshold of high enough sulphuric acid and ammonia concentrations is probably needed as the number of newly formed particles was correlated with the product of the sulphuric acid production and the ammonia concentrations. No such correlation was found with the oxidation products of terpenes. The condensation sink, i.e., effective particle area, is probably of importance as no nucleation was observed at high values of the condensation sink. From measurement of the hygroscopic properties of the nucleation particles it was found that inorganic compounds and hygroscopic organic compounds contributed both to the particle growth during daytime while at night ... |
format |
Article in Journal/Newspaper |
author |
Kulmala, M. Hämeri, K. Aalto, P.P. Mäkelä, J.M. Pirjola, L. Nilsson, E. Douglas Buzorius, G. Rannik, Ü. Dal Maso, M. Seidl, W. Hoffman, T. Janson, R. Hansson, H.-C. Viisanen, Y. Laaksonen, A. O’dowd, C.D. |
author_facet |
Kulmala, M. Hämeri, K. Aalto, P.P. Mäkelä, J.M. Pirjola, L. Nilsson, E. Douglas Buzorius, G. Rannik, Ü. Dal Maso, M. Seidl, W. Hoffman, T. Janson, R. Hansson, H.-C. Viisanen, Y. Laaksonen, A. O’dowd, C.D. |
author_sort |
Kulmala, M. |
title |
Overview of the international project on biogenic aerosol formation in the boreal forest (BIOFOR) |
title_short |
Overview of the international project on biogenic aerosol formation in the boreal forest (BIOFOR) |
title_full |
Overview of the international project on biogenic aerosol formation in the boreal forest (BIOFOR) |
title_fullStr |
Overview of the international project on biogenic aerosol formation in the boreal forest (BIOFOR) |
title_full_unstemmed |
Overview of the international project on biogenic aerosol formation in the boreal forest (BIOFOR) |
title_sort |
overview of the international project on biogenic aerosol formation in the boreal forest (biofor) |
publisher |
Milton Park : Taylor & Francis |
publishDate |
2001 |
url |
https://doi.org/10.34657/1185 https://oa.tib.eu/renate/handle/123456789/594 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Tellus B: Chemical and Physical Meteorology, Volume 53, Issue 4, Page 324-343 |
op_rights |
CC BY 4.0 Unported https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.34657/1185 |
_version_ |
1772812810464526336 |