HR: 0830h
AN: A21D-1013    [PDF]
TI: Effects of the Pinatubo Aerosols on South Hemisphere High Latitude Ozone Measured with TOMS/NASA and Analyzed with Artificial Neural Networks
AU: Parodi, M
EM: parodi@ifir.edu.ar
AF: Institute of Physics Rosario (CONICET - National University of Rosario), 27 de Febrero 210bis, Rosario, SF 2000 Argentina
AU: Parodi, M
EM: parodi@ifir.edu.ar
AF: Facultad de Ciencias Exactas, Ingenier¡a y Agrimensura, Pellegrini 250, Rosario, SF 2000 Argentina
AU: Ceccatto, H A
EM: ceccatto@ifir.edu.ar
AF: Institute of Physics Rosario (CONICET - National University of Rosario), 27 de Febrero 210bis, Rosario, SF 2000 Argentina
AU: Ceccatto, H A
EM: ceccatto@ifir.edu.ar
AF: Facultad de Ciencias Exactas, Ingenier¡a y Agrimensura, Pellegrini 250, Rosario, SF 2000 Argentina
AU: * Piaentini, R D
EM: ruben@ifir.edu.ar
AF: Institute of Physics Rosario (CONICET - National University of Rosario), 27 de Febrero 210bis, Rosario, SF 2000 Argentina
AU: * Piaentini, R D
EM: ruben@ifir.edu.ar
AF: Facultad de Ciencias Exactas, Ingenier¡a y Agrimensura, Pellegrini 250, Rosario, SF 2000 Argentina
AB: We present a detailed analysis of the total ozone column losses in the Southern Hemisphere high latitudinal band (55§S-60§S) after Mount Pinatubo eruption in June 1991, based on measurements of TOMS/Nimbus7 satellite instrument up to April 1993. Different artificial neural networks (ANNs) were trained to predict the expected unperturbed ozone values in the June 1991-April 1993 period. The predictions of the best performing ANN are then compared with the observed values in this period in order to determine the net Pinatubo effect. This comparison reveals a positive anomaly of (5+-3) % observed in 1991 late spring and 1992 summer and disappears in early 1992 autumn. After this, an ozone loss appears in Southern Hemisphere winter and spring 1992, reaching a maximum of (-12+-3) % on September, that is followed by a steady recovering to unperturbed values on late 1992. The characterized anomalies can be attributed to sulfate aerosol generated by the Pinatubo eruption, as they agreed with the aerosol surface area density measured by the SAGE II satellite in the latitude and period studied in the present work. The predictions of ANNs are in quite good agreement with those of an interactive 2-D radiative-dynamical-chemical model.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0325 Evolution of the atmosphere
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting