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Daily variations of total ozone and the surface ozone concentration
Figure 3 shows daily variations of total ozone. Change of total
ozone is insignificant during day in a different seasons.
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Figure 3.Daily value of total ozone:a-winter (22.01.1997); b-spring (24.03.1994); c-summer (25.07.1997); d- autumn (21.09.1994). |
Daily variations of the surface ozone concetration were demonstrated
in figure 4. The noticeable noon increase of the surface ozone
concentration is observed in summer and least variations in winter.
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Figure 4.Daily value of the surface ozone concentration:a-winter (05.01.1994); b-spring (11.05.1995); c-summer (06.06.1994); d- autumn (11.10.1994). |
Such behaviour of the surface ozone concentration is able to explain
by variations of the solar flux and photochemical nature of ozone.
In summer the solar flux is increased in noon and conduces the
increase of the surface ozone concentration. In winter the solar
flux is changed less than in summer.
Observations of total ozone and the surface ozone concentration
are interesting in period when city smog comes to the ozone station.
Ozone station is placed in zone with mountain-valley circulation.
In morning the ozone station is in zone of the clean mountain
air. During day the city smog comes to the ozone station. In city
Almaty the photochemistry smog will able to be expected because
of combustion gases and the high solar flux in summer.
City air coming to ozone station leads to significant increase
of the surface ozone concentration. In such periods the measurements
of total ozone, atmospheric pollution and the surface ozone concentration
were carried out at same time. Figure 5 shows the behaviour of
measurement values.
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Figure 5.Variation of total ozone, the surface ozone concentration and aerosol thickness in period when city smog comes in ozone station (1-winter;2- summer):a- the surface ozone concentration; b-aerosol thickness; c-total ozone. |
One can see that value of total ozone is constant during day, atmospheric pollution is increasing and the noon value of the surfase ozone concentration is increased in summer. Such behaviour of the surface ozone concentration confirm the presenting photochemistry smog of Los-Angeles type in city Almaty. In winter the city smog does not lead to the noticeable increase of the surface ozone concentration. Apparently two processes compete in winter: ozone formation as result of photochemistry reaction and ozone destruction on aerosols. Aerosol concentration are sharply increasing in winter.
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