Abstract
We consider the results of long-term remote optical monitoring, obtained at the Siberian Lidar Station of Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences in Tomsk (56.5°N, 85.0°E). The scattering characteristics of stratospheric aerosol layer, obtained according to data of lidar measurements since 1986, are presented. We analyze the trends of changes in the total ozone (TO) content over Tomsk for the period 1996-2013 according to data of spectrophotometric measurements with employment of Total Ozone Mapping Spectrometer (TOMS) data for the period 1979-1994. We determined the periods of elevated content of stratospheric aerosol over Tomsk aftera series of explosive eruptions of volcanoes of Pacific Ring of Fire and Iceland in 2006-2011. Since the second half of 1990s, we record an increasing TO trend, equaling 0.65 DU/yr for the period 1996-2013.
Highlights
We determined the periods of elevated content of stratospheric aerosol over Tomsk after a series of explosive eruptions of volcanoes of Pacific Ring of Fire and Iceland in 2006-2011
Photoelectron recording of lidar signals is performed in photocurrent pulse counting mode
The numerous studies of ozonosphere state after powerful volcanic eruptions such as El Chichon (1982), Pinatubo (1991), and others, performed abroad and at Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences, show the effect of elevated stratospheric aerosol (SA) content on destruction of ozone layer, when total ozone (TO) depletion is observed for a few years after eruption [2,3,4]
Summary
ABSTRACT volcanically quiescent period with minimal content of stratospheric aerosol (SA), which is a. Studies of the physical mechanisms of atmospheric changes rely upon obtaining and subsequent statistical and correlation analysis of time series of long-term regular measurements. This analysis makes it possible to develop empirical models of atmospheric parameters; determine seasonal, quasibiennial, and other periodic cycles of variations; study the mechanisms that determine the dynamics and interrelations of measured parameters; reveal short-term disturbances of the atmosphere and gradually accumulated changes under the impact of natural and anthropogenic factors; and, determine and predict the trends of atmospheric changes, together with providing
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