MODEL ANALYSIS OF NORTHERN MIDLATITUDE TROPOSPHERIC COMPOSITION CHANGES IN THE 1980s DUE TO VARIATIONS IN THE SOLAR CYCLE AND ANTHROPOGENIC POLLUTION

A. A. Kiselev and I. L. Karol

The response of the tropospheric gas composition in the northern temperate belt to changes in the intensity of anthropogenic pollution of the atmosphere and to variations of solar radiation in the 11-year solar cycle in the period 1980-1991 is under consideration. Complete measurements of concentrations of individual air constituents, total ozone, and solar spectrum are used along with expert estimates of variability and geographical distribution of the strength of atmospheric pollution sources for the given period. The analysis of the estimates obtained has singled out contributions of anthropogenic and natural factors to the evolution of basic tropospheric gas constituents and of gas destruction rates in photolytic reactions. Calculations have been done in a two-dimensional channel (height-longitude) photochemical model of the troposphere for the 30-60°N belt.