The tenth IMSC, Beijing, China, 2007 - International Meetings on ...

are analyzed. It is shown that these currents are generated predominantly by the zonal
component of wind stress, in which the half-year harmonic dominates. This leads to the fact
that the equatorial surface current also changes its direction with a half-year periodicity almost
in phase with the wind. <strong>The</strong> oppositely directed subsurface compensational countercurrent
changes its direction with a time lag of approximately one month. Gradient currents, which
appear in the Bay of Bengal due to the riverine runoff, make an important contribution to the
circulation. This effect manifests itself especially strongly in the summer during the peak of the
Ganges River runoff, which transports fresh turbid waters. <strong>The</strong> principal features of the
large-scale quasi-stationary gyre structure of the Indian Ocean such as the Great Whirl,
Socotra high, and Laccadive high and low are simulated.
<strong>The</strong> Study of the Impacts of Meteorological Parameters on the Air Quality Index in the Esfahan
City
Victoria Ezzatian
Isfahan Meteorological Office
victoria_ezzatian@yahoo.com
Air is the certain composition of different gases. If the percent of these compositions be
changed which has been harmful effectiveness on human health or alive things,it be called air
pollution. For numerising the quality of air and reporting it to common, Air Quality Indices were
been used thus pollution standard index is one of these indecies. A standard Air Quality Index
changes the density of surface pollutants to a dimentionless number. This index classified by
50 units that each number expresses the especial condition of air quality by Good, Moderate,
Unhealthy and very Unhealthy words. <strong>The</strong> goal of this investigation is stuying the effect of
meteorological parameters on Esfahan Air Quality Index by Isfahan Meteorological Weather
Station, Environmental Organization Stations. So, first of all we calculated air quality index by
special software during 1383-1385. Because of Ozone is very important for determining Air
Quality Index so we studied it during 1995-2005.For determining the effectes of meteorological
parameters on Air Quality Index we used the meteorological data on surface and 13 standard
upper levels. Calculations expressed that Maximum Temperature, Average Temperature,
Total Solar Radiation and surface Pressure have strong effects on Total Ozon measurments.
Dioxside Nitrogene in spring and summer, Dioxside Sulfure in autumn and winter had
maximum values. Dencity of Carbonmonoxide changes with trafic pattrern and man activities
and its values upper than other pollutants. Dencity of Pulb and Cadmium changes with traffic
pattern. Particular Matter in dry days had upper levels in compare of wet days and more than
half of them had about 0.1 micrometere diameter. Normalised Residual Mass Curve of Total
Ozone showed that Ozon fluctuations decreses in recent years. Upper level meteorological
parameters had strong effect on Ozon especially temperature in 50 milibar level. Total ozone
in spring had high valuse and in winter had low values. We calculated the statistical
relationships between Air Quality Index and meteorological parameters on surface and upper
standard levels. Calculations showes that relationships between Total Ozone and Total Sun
Radiation is more than Sunny Hours.Termal Island Effect on Isfahan city due to consuming
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