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Tropospheric ozone (O3T) is a secondary pollutant whose formation involvedprimarily solar radiation, NOx and volatile organic compounds. The North of theBuenos Aires Province has great agricultural-industrial activity; therefore,O3T study is an important issue in the area. In this paper, we present thefirst results tend to estimate and characterize O3T in San Nicol\'as de losArroyos, North of Buenos Aires. Due to a lack of in situ data, we analyse theobservations of the instrument OMI (Ozone Monitoring Instrument) of land remotesensing satellite AURA (GSFC/NASA). The data cover the years 2004-2013.Applying the multitaper technique (MTM), very suitable for short and noisy dataseries, spectral analysis is performed on a grid corresponding 1{\deg} inlatitude by 1.5{\deg} in longitude, centred South of the Province of Santa Fe.The most remarkable result is the emergence of a significant peak (95%) of fourmonths cycle. To test the validity of this signal in San Nicol\'as, daily solarradiation data (Q) were analysed in the area. The application of MTM to thedaily values of Q, yields a spectral peak of 120 days. It is concluded thatatmospheric opacity on the site has four months variations that modify thesolar radiation at the troposphere, and consequently, the production rate ofO3T. Evidence that these variations are due to teleconnection processoriginated in the Maritime Continent are presented.

Intraseasonal characterization of tropospheric O3 in the North of the  Buenos Aires Province: determining four months cycle and teleconnection  evidence