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The vertical distribution of atmospheric DMS in the high Arctic summer
Stockholm University, Faculty of Science, Department of Meteorology .
Stockholm University, Faculty of Science, Department of Meteorology .
Institut fur Ionenphysik and Angewandte Physik, Universität Innsbruck.
Stockholm University, Faculty of Science, Department of Meteorology .
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2010 (English)In: Tellus. Series B, Chemical and physical meteorology, ISSN 0280-6509, E-ISSN 1600-0889, Vol. 62, no 3, 160-171 p.Article in journal (Refereed) Published
Abstract [en]

The vertical structure of gas-phase dimethyl sulfide, DMS(g), in the high Arctic atmosphere is investigated during a summer season. The model results show that the near-surface DMS(g) concentration over open ocean is very variable both in time and space, depending on the local atmospheric conditions. Profiles over ocean have typically highest concentration near the surface and decrease exponentially with height. Over the pack-ice, the concentrations are typically lower and the vertical structure changes as the air is advected northward. Modeled DMS(g) maxima above the local boundary layer were present in about 3\% of the profiles found over the pack-ice. These maxima were found in association to frontal zones. Our results also show that DMS(g) can be mixed downward by turbulence into the local boundary layer and act as a local near--surface DMS(g) source over the pack-ice and may hence influence the growth of cloud condensation nuclei and cloud formation in the boundary layer. Profile observations are presented in support to the model results. They show that significant DMS(g) concentrations exist in the Arctic atmosphere at altitudes not to be expected when only considering vertical mixing in the boundary layer.

 

Place, publisher, year, edition, pages
2010. Vol. 62, no 3, 160-171 p.
Keyword [en]
Arctic DMS modelling
National Category
Meteorology and Atmospheric Sciences
Research subject
Meteorology
Identifiers
URN: urn:nbn:se:su:diva-38175DOI: 10.1111/j.1600-0889.2010.00458.xOAI: oai:DiVA.org:su-38175DiVA: diva2:306735
Available from: 2010-03-30 Created: 2010-03-30 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Atmospheric DMS in the High Arctic
Open this publication in new window or tab >>Atmospheric DMS in the High Arctic
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

During the Arctic summer when the anthropogenic influence is limited, the natural marine source of sulfur in the form of gas-phase dimethyl sulfide viz. DMS(g), is of great importance for cloud formation. The harsh environment of the Arctic makes it difficult to perform in situ measurements of DMS(g) and hence regional model simulations can serve as a complement to increase our understanding of DMS related processes in the Arctic. In this thesis a regional scale meteorological forecast model, extended with DMS(g) calculations, is used to provide a consistent three-dimensional time evolving picture of DMS(g) over the pack-ice region. The analysis focus on meteorological aspects on the horizontal and vertical distribution of DMS(g). Our results show that the amount of DMS(g) over an oceanic source region alone does not determine concentration found over the pack-ice, the prevailing wind also exerts a large influence on the horizontal DMS(g) distribution.

The modeled DMS(g) concentrations are advected in plumes in over the pack-ice, which, in combination with the photo-chemical decay, explain the large observed temporal variability of DMS(g) over the pack-ice. The modeled vertical structure show episodes with DMS(g) maxima well above the local boundary layer. Also shown is that DMS(g) maxima can be formed adjacent to frontal zones. In the presence of turbulence DMS(g) can be mixed downwards into the local boundary layer and aid growth to local particles and hence contribute to cloud formation in the boundary layer.

 

Place, publisher, year, edition, pages
Stockholm: Department of Meteorology, Stockholm University, 2010. 47 p.
Keyword
DMS, Modelling, Arctic
National Category
Meteorology and Atmospheric Sciences
Research subject
Meteorology
Identifiers
urn:nbn:se:su:diva-38178 (URN)978-91-7447-043-7 (ISBN)
Public defence
2010-04-29, sal G, Arrheniuslaboratorierna, Svante Arrhenius väg 20 C, Stockholm, 10:00 (English)
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Supervisors
Note
At the time of the doctoral defense the following papers were unpublished and had a status as follows: Paper 1: Manuscript. Paper 2: Manuscript. Paper 4: Manuscript.Available from: 2010-04-07 Created: 2010-03-30 Last updated: 2010-04-06Bibliographically approved

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Publisher's full texthttp://onlinelibrary.wiley.com/doi/10.1111/j.1600-0889.2010.00458.x/abstract

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