Atmospheric ozone and flow field variations over Lisbon |
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| Authors: | Figueira M F |
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| Institution: | (1) Servico Meteorológies Nacional R. Saraiva de Carvalho 2, Lisboa-3, Portugal;(2) Faculdade de Ciências de Lisboa, R. da Escola Politecnica, Lisboa, Portugal |
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| Abstract: | The results of the observations of both total and layered ozone content of the atmosphere, the latter from C wavelength Umkehr observations, made in Lisbon (38° 46 N; 09° 09W) during the period 1967 to 1971 by the Serviço Meteorológico Nacional, are analysed on a statistical basis in relation to the flow and temperature fields of the atmosphere, namely in relation to the position of the tropospheric jet axis and thê 100 mb air temperature.The preliminary results of the analysis show that the yearly mean variation of the total O3 follow the very well-known trend as observed for other geographical coordinates, with a winter to spring maximum. In addition, the same parameter is positively correlated to the 100 mb temperature field for the seasons of the year, and it was found, both on a large time-scale and for synoptic distributions, that the total amount of O3 is significantly higher a few hundreds of kilometres to the left of the jets looking downstream than to the right, so that mean cross-flow gradients of O3 are field features to be taken into account.The time-height distributions of ozone from the Umkehr technique has revealed, in the long-term mean used, a descent of the level of the maximum of around 20 mb depth from the summer-winter period to spring, but this descent may be much more pronounced on occasions, as revealed by the preliminary analysis of a few days' period of important ozone changes in relation to the potential temperature and jet axis position. this showed, in addition, the existence of varying gradients along the stream, whereby differences in circulation along the jet complex may be implied.Work done for the Project LF2 of the IAC |
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