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4. Conclusions

The new background conditions in the stratospheric aerosol layer have been confirmed in the tropical area combining lidar and SAGE II measurements. The IBC mean value during the last two years of record shows the lowest record ever in that area for similar periods of time. Our results agree with former reports from lidar and SAGE II studies.

The decaying trend of the high aerosol content after El Chichón and Pinatubo studied for the period covering two and half and seven years after the eruptions show the same exponential trend. The e-folding decay for that period is around 24 months.

Individual extintion profiles comparisons showed little differece between measurements located near and far of the lidar. The homogeneity of the stratospheric aerosols under background conditions could be consider the reason for such feature.