The inter-annual variability of atmospheric DMS in the high Arctic summer
(English)Manuscript (preprint) (Other academic)
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.
Arctic DMS modelling
Meteorology and Atmospheric Sciences
Research subject Meteorology
IdentifiersURN: urn:nbn:se:su:diva-38174OAI: oai:DiVA.org:su-38174DiVA: diva2:306737