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.