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On small particles in the Arctic summer boundary layer: observations at two different heights near Ny-Ålesund, Svalbard
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
Stockholm University, Faculty of Science, Department of Meteorology .
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2008 (English)In: Tellus. Series B, Chemical and physical meteorology, ISSN 0280-6509, E-ISSN 1600-0889, Vol. 61, no 2, 473-482 p.Article in journal (Refereed) Published
Abstract [en]

Concurrent observations of particle number densities and size distributions observed at two different heights (near ocean level and 475 m above sea level) in Ny-Ålesund, Svalbard were studied with respect to the diurnal variation during a summer period in June 2004. The results show that observed variation in particle number density in the Arctic boundary layer may be strongly modulated by vertical mixing and dilution. The particles appeared to be formed in the early morning when solar intensity reached about 30% of the mid-day intensity. Based on differences in the observed number densities at the two heights it appears as if particles are formed in the lower part of the boundary layer. The formation rate of 10 nm diameter particles is estimated to be 0.11 cm−3 s−1 and the growth rate is in a range between 1 and 2 nm h−1.

Place, publisher, year, edition, pages
2008. Vol. 61, no 2, 473-482 p.
National Category
Meteorology and Atmospheric Sciences
Research subject
Atmospheric Sciences
Identifiers
URN: urn:nbn:se:su:diva-24907DOI: 10.1111/j.1600-0889.2008.00412.xOAI: oai:DiVA.org:su-24907DiVA: diva2:198504
Note
Part of urn:nbn:se:su:diva-7524Available from: 2008-05-08 Created: 2008-04-23 Last updated: 2017-12-13Bibliographically approved
In thesis
1. Properties and Origin of Arctic Aerosols
Open this publication in new window or tab >>Properties and Origin of Arctic Aerosols
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The present thesis deals with the origin and physics of aerosols in the Arctic atmosphere. These show a large annual variability due to changes of the photochemical and cloud processes as well as of the synoptic-scale atmospheric pressure patterns. High concentrations of anthropogenic trace gases and particles are found in the atmosphere during winter and spring, whereas the summer period is least affected as regards human impact. The thesis is based on a synthesis of aerosol observations from ground stations as well as research aircraft. A major goal was to study the shift that the Arctic aerosol-size distribution undergoes from spring to summer, a transition that takes place during a rather short period of around 10 days. Six years of aerosol, chemical, and transport data are investigated for the April-June period. This analysis indicates that the rapid transition is governed by a delicate balance between insolation and the source and sink processes affecting the aerosol. In-situ observations show that exchange processes between the boundary layer and the free troposphere may be a key component governing the temporal evolution of the aerosol during summer. It has been concluded that air-borne measurements are essential for establishing the vertical distribution of the aerosol (knowledge of which may be essential when analysing long-term and point measurements). As emphasized in the thesis, insights concerning this vertical structure are especially valuable when layers aloft show concentrations of soot or light-absorbing aerosol and, in addition, the environment is highly reflecting, as is the case in the Arctic. Such plumes, transported from lower latitudes and difficult to detect from the surface, are suggested to have contributed to the high-altitude Arctic warming trend observed during the last two decades. The results in this thesis underline that merging long-term observations with aircraft measurements is highly useful when studying aerosol and its effects.

Place, publisher, year, edition, pages
Stockholm: Meteorologiska institutionen (MISU), 2008. 118 p.
Keyword
Arctic aerosols, Arctic troposphere, air-mass transport
National Category
Meteorology and Atmospheric Sciences
Research subject
Atmospheric Sciences
Identifiers
urn:nbn:se:su:diva-7524 (URN)978-91-7155-647-9 (ISBN)
Public defence
2008-05-30, sal G, Arrheniuslaboratorierna, Svante Arrhenius väg 14-18, Stockholm, 10:00
Opponent
Supervisors
Available from: 2008-05-08 Created: 2008-04-23Bibliographically approved

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Publisher's full texthttp://www3.interscience.wiley.com/journal/122190118/abstract
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Department of Applied Environmental Science (ITM)Department of Meteorology
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Tellus. Series B, Chemical and physical meteorology
Meteorology and Atmospheric Sciences

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