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In-situ airborne observations of the microphysical properties of the Arctic tropospheric aerosol during late spring and summer
Stockholm University, Faculty of Science, Department of Meteorology .
Stockholm University, Faculty of Science, Department of Meteorology .
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
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2008 (English)In: Tellus. Series B, Chemical and physical meteorology, ISSN 0280-6509, E-ISSN 1600-0889, Vol. 60, no 3, 392-404 p.Article in journal (Refereed) Published
Abstract [en]

In-situ aerosol data collected in the Arctic troposphere during a three-week period in 2004 were analysed. The measurements took place during late spring, i.e., at the time of the year when the characteristics of the aerosol distribution change from being accumulation-mode dominated to being primarily of the Aitken-mode type, a process that previously has been observed in the boundary layer. To address the question whether this transition is also detectable in the free troposphere of an aircraft-measured data from the ASTAR 2004 campaign were analysed. In this study, we present vertically as well as temporally results from both ground-based and airborne measurements of the total number concentrations of particles larger than 10 and 260 nm. Aircraft-measured size distributions of the aerosol ranging from 20 to 2200 nm have been evaluated with regard to conditions in the boundary layer as well as in the free troposphere. Furthermore an analysis of the volatile fraction of the aerosol population has been performed both for the integrated and size-distributed results. From these investigations we find that the transition takes place in the entire troposphere.

Place, publisher, year, edition, pages
2008. Vol. 60, no 3, 392-404 p.
National Category
Meteorology and Atmospheric Sciences
Research subject
Atmospheric Sciences
Identifiers
URN: urn:nbn:se:su:diva-24906DOI: 10.1111/j.1600-0889.2008.00348.xISI: 000256845400010OAI: oai:DiVA.org:su-24906DiVA: diva2:198503
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/119877876/abstract
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Department of Meteorology Department of Applied Environmental Science (ITM)
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Tellus. Series B, Chemical and physical meteorology
Meteorology and Atmospheric Sciences

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