Generation of ozone in the surface air layer versus air temperature
B.D. Belan, D.E. Savkin, G.N. Tolmachev
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
Keywords: атмосфера, воздух, зависимость, озон, приземный слой, температура, atmosphere, air, dependence, ozone, surface air layer, temperature
Abstract
The temperature dependence of the atmospheric ozone generation rate on the air temperature is studied on the basis of measurement data in a background area. The type of this dependence is ascertained by the method based on the comparison of variations in the ozone concentration when waves of heat and cold pass through the measurement site. This approach allowed us to derive the quantitative, but not qualitative, dependence for the first time. The coefficients of the expression depend on both the air temperature and initial ozone concentration. Thus, at a long-term minimum of surface ozone concentration (1999) at a temperature of 30 °C, its change by 1 °C corresponds to the increase in the ozone concentration of 5 μg/m3. At a maximum of concentration (2001) at the same temperature, the increase can make nearly 25 mg/m3 per 1 °C. In the intermediate periods (1997 and 2010), it is about 14 μg/m3 per 1 °C. The analysis shows that this dependence is quadratic due to a nonlinear increase in the constants of reactions and quadratic increase in the hydrocarbon emissions by vegetation with the air temperature.
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