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A case study of the low total ozone event over Europe on 14 February 2001

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A low total ozone event was observed over the Baltic Sea on 14 February 2001. This was of interest because the polar vortex in the stratosphere associated with this event moved eastward and covered Japan several days later. The central location of the observed low total ozone event on 14 February 2001 was around 59°N 23°E. Over this location, the total ozone amount was at the lowest (225DU (Dobson units)) on 14 February. Correlation analyses were conducted on the isentropic surfaces of Central Europe in order to ascertain the mechanism of this event. It was found that there was an uplift of the isentropic surface between 330K and 750K and a downward shift of the 300K isentropic surface associated with this event. It was also found associated with this event, that the ozone mixing ratio decreased on almost all the isentropic surfaces except over 400K and 450K. It is noted that the region between the 300K and 350K isentropic surfaces was filled by the air mass from lower latitudes, and that the 450 750K isentropic surfaces were covered with the air mass from higher latitudes. It is demonstrated that the chemical effects caused by low temperature were so small for the total ozone loss event on 14 February 2001. Hence, it is suggested that the primary reason for the low total ozone event on 14 February 2001 is a dynamical one.

Document Type: Research Article


Affiliations: 1: Meteorological Research Institute, 1‐1, Nagamine, Tsukuba‐shi, Ibaraki, 305‐0052 Japan 2: Aerological Observatory, 1–2, Nagamine, Tsukuba‐shi, Ibaraki, 305‐0052 Japan 3: Hakodate Marine Observatory, Mihara 3‐4‐4, Hakodate‐shi, Hokkaido, 041‐0806 Japan

Publication date: August 20, 2005

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