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

The horizontal distribution of gas--phase dimethyl sulfide, DMS(g), in the Arctic atmosphere north of 70N is investigated during a summer season using the three--dimensional numerical model COAMPS©. The highest modeled median DMS(g) concentration over the ocean is found in the Kara and Greenland Seas. The simulated DMS(g) concentration is the result of the interaction between factors such as the local DMS flux, wind speed and direction as well as adjacent areas of open ocean. Over the pack—ice, around the North Pole (north of 88N), DMS(g) concentrations are generally lower. The horizontal distribution of atmospheric DMS over the pack--ice is determined by transports associated with synoptical weather systems together with the source strength of DMS(g) taking into account photochemical decay. Trajectory analysis shows that in July and August, 2001, the Greenland--Sea sector was the dominating source region for DMS(g) found in the North--Pole region due to the prevailing winds from this region. Averaging DMS(g) over the lowest atmospheric layer (below 200 m) for time periods from a few days to a month shows a gradual decrease northwards of the concentration over the pack--ice resulting from DMS(g) being continuously advected in well-defined plumes. In contrast to the narrow DMS(g) plume with its source over the Chukchi Sea in July, a wide plume originating from the Kara, Barents and Greenland Seas was present in August 2001. Both plumes extended more than 100 km in over the pack--ice.

 

Keyword [en]
Arctic DMS modellering
National Category
Meteorology and Atmospheric Sciences
Research subject
Meteorology
Identifiers
URN: urn:nbn:se:su:diva-38173OAI: oai:DiVA.org:su-38173DiVA: diva2:306733
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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