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16 November 2000 Ozone transport in the mid-latitudes of South America in ozone hole conditions
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In 1993 a network of differential optical absorption instruments was deployed in Argentina and Chile to study the evolution of the ozone layer in the mid latitudes of South America. The data obtained by this network were compared with the data provided by TOMS (NASA) and TOVS (NOAA) satellite instruments and a good correlation was found. NCAR meteorological data were also used to study in detail the ozone transport in the stratosphere under ozone hole conditions. The data provided by both, the ground based and the spaceborne instruments, revealed that sudden and transient decreases of total ozone column values took place in the mid-latitudes of South America each spring in the period 1993 - 1998. These low ozone events occurred quasi- simultaneously at quite different latitudes. The analysis of potential vorticity maps showed that the lower stratosphere polar vortex penetrated up to approximately latitude 50S in South America every spring since 1993. In addition it was found that the low ozone events were accompanied by sudden air temperature decreases in the lower stratosphere. The computation of the 3D back-trajectories of air parcels showed that air from the surroundings of the ozone hole were transported to the mid latitudes regions. An anti- correlation between air parcels height and total ozone along the trajectory was found suggesting that vertical displacement of air also contributed to the observed ozone and temperature decreases.
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Abelardo Perez-Albinana, Juan Rubio, Javier Sanchez, Mercedes Vila, Nuria Figuerola, Inigo Aguirre de Carcer, and Francisco Jaque "Ozone transport in the mid-latitudes of South America in ozone hole conditions", Proc. SPIE 4131, Infrared Spaceborne Remote Sensing VIII, (16 November 2000);

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