• Introduction
• Analysis of the Data
• Conclusion and comments
• References

FIGURES

• Figure 1
• Figure 2
• Figure 3
• Figure 4

The study of the instability of the ozone Antarctic hole and their consequences in the south cone of America, it demonstrate that ozone Antarctic hole owes their formation to the stratospheric vortex polar, and their displacement and oscillations are related with the section of this vortex, existing a tendency of projections of ozone-poor air masses coming from the vortex over the natural axis of the Antarctic peninsula, that during periods of maxim intensity presents an East-West oscillation associate usually to incursions of polar masses of ozone-poor air coming from the polar vortex, towards the south cone of America, occasioning events of ozone depletion in mid-latitudes. In order to study these phenomenons, it developed a model of profile distribution of stratospherics ozone associated with the events of ozone depletion. They were carried out campaigns of mensuration of total ozone in the south cone of America in 1993 and 1994, it result a high correlation between the data of ozone registered by satellite (TOMS) and the gotten registrations in situ for the ground stations. This fact is of great importance in the study of the phenomenon, due to one would can to know the events of ozone depletion in periods and zones where the ground stations didn't exist, this was possible in the construction of the profiles utilizing potential vorticity (PV) and isentropic surfaces. Applied the model with the NCEP/NCAR Reanalysis Project data and contrasting these profiles with the existent registrations in ground, it result a high correlation between the model distributions with the satellite and the events of ozone depletion.

Introduction

The dynamic of the ozone Antarctic hole are related strongly with the stratospheric vortex polar. The displacements and oscillations of the ozone Antarctic hole are conditioned strongly for the section of the stratospheric vortex polar. During the periods of strong ozone depletion in spring, an East-West oscillation on the natural axis of the Antarctic Peninsula is produced, transporting polar masses of ozone-poor air toward the south cone of America, occasioning events of ozone depletion in mid-latitudes. [1]

For the study of these phenomenon's is needed a tool that helps to identify and following the ozone-poor air masses, with this purpose developed a model what characterize the phenomenon of ozone depletion. Basically the model identifies the masses of air by the potential vorticity (PV) and the isentropics surfaces (q) identifying the characteristic profiles of the masses of air in study of another. From a dynamic point of view, the profiles evidence the atmospheric transport of the ozone-poor air masses.

Analysis of the Data

The measurements of ozone for ground stations in the Antarctic continent and the ground stations between 1993-1994 on the meridional point Chile-Argentina (parallel 23º at 54º south) demonstrate a good correspondence between mensurations by satellite and the ground stations (see fig.1 and fig.2), this fact demonstrates that the configurations of the ozone distribution over the Antarctic continent and the south cone of America are correct. [4]

They were created the first computer tools in GrADS and MATLAB, using data of the NCEP/ NCAR, in order to get the characteristic searched profiles. [3]. The study of the dynamic instability of the ozone Antarctic hole is possible using representatives profiles.

The information on the decreases in the total ozone column over the West coast of South America have been available since 1978, principally during the summer season in the southern hemisphere [2]. The profile distribution of stratospheric ozone associated with the ozone depletion in the south cone of America, they evidence the relationship between the ozone-poor air masses coming from the polar Antarctic vortex from the south to north. The maps of ozone gotten by the satellites (TOMS), they have a high correlation with the maps gotten by the model for the air masses of coming from the polar Antarctic vortex.

Conclusion and comments

The application of this method could guide the scarce knowledge that exists concerning the configurations that would have the mass of air (polar origin) and their intrudes in the south cone of America, in previous periods to the satellites (TOMS), like also in the identification of the stratospheric masses air of polar origin that intrudes toward the south cone of America. The detailed work is part of the antecedents that they are proportioned to the centers of investigation and universities been interested in granting the necessary conditions in order to could develop the project.

Fig. 1

Fig. 2

Fig. 3

Fig. 4

References

[1] Da Silva, D. Araya. "The ozone layer depletion on the west border of South America" Workshop: Understanding Stratospheric Ozone and UV-B Radiation. Departamento de Ciencias de la Atmósfera, Universidad de Buenos Aires, Argentina. March 9-11, (1998).

[2] Nimbus-7 TOMS Data & Images. Data Record 11/01/1978 - 05/06/1993. Meteor-3 TOMS Data & Images. Data Record :08/22/ 1991 - 11/24/1994. ADEOS TOMS Data & Images. Data Coverage : 09/11/1996 - 06/29/1997. Earth Probe TOMS Data & Images. Data Coverage : 07/25/1998 - Present.

[3] NCEP/NCAR Reanalysis, Global Atmospheric Analysis, various years. National Centers for Environmental Prediction, Washington DC and National Center for Atmospheric Research, Boulder, CO, USA.

[4] A. Torres, L. Da Silva, "Model of Profiles Distribution of Stratospherics Ozone Associated with the Events of Ozone Depletion in Middle Latitudes in South America", 6^th International Conference on Southern Hemisphere Meteorology and Oceanography, AMS, 13, (2000).