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The inter-annual variability of atmospheric DMS in the high Arctic summer
Stockholm University, Faculty of Science, Department of Meteorology .
Stockholm University, Faculty of Science, Department of Meteorology .
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Meteorological aspects on the DMS(g) dispersion in the high Arctic atmosphere during the summer season are studied with a regional model that is applied over the pan-Arctic region. Four individual years, 1991, 1996, 2001 and 2007 with variable seasonal ice-melt are studied. The model results show that the Kara, Barents and Greenland Seas are the dominating source regions for DMS(g) found around the North-Pole region in three of the four years. The situation is quite different in 2007 where the concentration mainly originates from the East Siberian Sea. This due to the meteorological conditions as well as the extensive ice-melt in August which increase the source region as well as reduce the distance to the North-Pole. The modeled temporal variability is large in near-surface DMS(g) concentration over the pack-ice region, where the highest concentrations are found in the Atlantic sector. The prescribed seasonal decline is overshadowed by the increase in DMS(g) concentration due to decreased ice extent. Our results show that DMS(g) concentrations are reaching the North-Pole region in well defined plumes originating from different source regions. In 2007 the plumes are more frequent and have high concentration compared to 1996 where only a few plumes reach the area early in the season. The horizontal and vertical distribution of DMS(g) over the pack-ice is determined by the transport associated to individual low-pressure systems entering the pack-ice region. This variability both in time and space illustrates the difficulty to generalize observations taken at specific locations and times over larger areas and time periods.

 

Keyword [en]
Arctic DMS modelling
National Category
Meteorology and Atmospheric Sciences
Research subject
Meteorology
Identifiers
URN: urn:nbn:se:su:diva-38174OAI: oai:DiVA.org:su-38174DiVA: diva2:306737
Available from: 2010-03-30 Created: 2010-03-30 Last updated: 2010-12-27Bibliographically 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)
Opponent
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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