Ozone 'minihole' over northern Scandinavia

Physics

Scientific paper

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Atmospheric Circulation, Ozone Depletion, Ozonosphere, Atlantic Ocean, Atmospheric Chemistry, Cyclones, Photochemical Reactions, Scandinavia

Scientific paper

During the first week of February 1990 the total ozone values over England and Scandinavia dropped to a minimum of approximately 200 DU. This minimum lasted, however, only for a couple of days at each of the stations, which are measuring ozone in the area. The ozone 'minihole' was not stationary, but it moved from the North Atlantic towards northern Scandinavia and the Kola peninsula during a 4-day period. From the ozone observations its path was traced over England towards Norway, Sweden, and Russia. In this paper we propose that the 'minihole' was mainly created by a strong cyclonic development in the North Atlantic, which moved towards Scandinavia. The cyclone development resulted in ascending air ahead of the cyclone in the troposphere and the lower stratosphere. The total ozone column was thereby reduced. However, this does not exclude the possibility that ozone also could have been reduced due to heterogeneous photochemical processes. The events took place during the CHEOPS III-Campaign, at Kiruna in Sweden, and gave most valuable information.

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