tailieunhanh - Advances in Measurement Systems Part 15

Tham khảo tài liệu 'advances in measurement systems part 15', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 556 Advances in Measurement Systems contrary in 2005 and 2006 and in 2009 too data are not presented here the monthly average temperature at both points was below the norm and it was accompanied with the strongly pronounced spring maximum of the surface ozone concentration. Minsk 0 50 too 150 200 250 Julian day 2008 Fig. 7. Comparison of day time ozone concentrations in Minsk and Preila in 2008 Positive deviations of temperature for the Preila station are a bit lower in the most cases than on the average for Belarus and negative deviations are a bit higher on the amplitude. However to directly link this distinction with the difference in monthly average values of the ozone concentration does not seem to be possible. It is also difficult to analyze relation of temperature fluctuations and the surface ozone concentration in winter months when concentration of ozone is minimal and an influence of measurement errors can be quite essential. An actual similarity of seasonal changes of the surface ozone concentration in Minsk and Preila their identical dependence on the temperature for the spring maximum indicate that both stations most of the time are affected by the same field of the tropospheric ozone originated from a global circulation of air masses in the Northern hemisphere. Only local factors specifically modulate this field resulting in differences of daytime results of measurements and a diurnal course. These distinctions disappear after averaging over the time interval exceeding the period of the synoptic phenomena typical for territories of both countries a few days and more . 557 Multi-wave differential optical absorption spectroscopy surface ozone measurement with open path meters Hours starting from 00 00 Fig. 8. Diurnal course of the surface ozone concentration average hour data in Minsk and in Preila during 24-28 July 2008. One can view intensification of exchange with the upper troposphere under the exposition of the growing solar radiation as

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