Influencia de la variabilidad atmosférica de baja frecuencia en el Atlántico Norte sobre las anomalías extremas de ozono en Islandia.

Abstract

The influence of the North Atlantic atmospheric low frequency variability on the ozone extreme events in the arctic station of Reykjavik is analyzed for the two 3-months sequences February-March-April and August-September-October through 1978-2002. First, the main geopotential modes over the Atlantic region in seven pressure levels (1000-10 hPa) have been obtained by the Empirical Ortoghonal Function technique on the monthly geopotencial means. The degree of conection between ozone extreme events in Reykjavik and atmospheric variability is quantified by a multiple stepwise regression. For both periods, significant connections between anomalous 10 hPa geopotential and ozone extreme events at Reykjavik are identified, with a direct relationship between the both variables anomalies on the site. Additionally, for August-September-October sequence, the total ozone at the arctic station appears influenced by surface geopotential anomalies (the second EOF) as well.