p. 59−76
2383-3076
Vol.4/No.2
p. 77−94
2383-3076
Vol.4/No.2
100) are assumed as polluted day. In conformity with the coherence and continuity of polluted days, among 410 polluted days for particulate matter pollutants, four summer patterns were detected and among 152 polluted days for carbon monoxide pollutants, one winter pattern was detected.
5. Conclusion
The existence of a stack height (anticyclonic) at 500 hPa level was observed in the synoptic maps during the investigation period in all four summer patterns. The anticyclonic position in model (A) includes the extent of the Red Sea, higher than the latitude of 20 degrees north to the center of Iran. The Arabian Peninsula center is the location of Anticyclone center. In model (B), the anticyclone with closed contour of 5875 geopotential meters is located in southeast of Iran and southern coasts of Oman. However in pattern (C) the existence of deep ascending is observed and includes the anticyclone position of the Arabian Peninsula to the west coast of the Red Sea. In model (D), the anticyclonic center with the closed contour of 5910 geopotential is located in Saudi Arabia, on the subtropical high pressure position. Generally, at the level of 500 mg, the variations of the anticyclone position between synoptic patterns in warm period, three models are placed in Saudi Arabia. Therefore, model (B) is the only model which is located on the east of Iran. While with the absence of these conditions in the cold period, the state of full-orbital is predominant. At the level of 850 hPa, the cyclonic conditions are predominant. The organization of pressure patterns in sea level is associated with the predominance of low pressure condition. The contour which is isotherms of 40 ° C is the witness for the thermal nature of this system. Whereas in winter patterns, contrary to the summer patterns, at the level of 850 hPa, the spatial organization of the anticyclonic is predominant. Furthermore, the existence of tab system pressure at sea level is the evidence for the complete coordination of the full height system location at high levels of air-sphere and pressure system at sea level. By shoaling the boundary layer, this factor will cause the confinement of pollutants close to the earth surface and the growth of pollutants concentration, in the anticyclonic conditions during the cool season.]]>
p. 95−115
2383-3076
Vol.4/No.2
p. 117−135
2383-3076
Vol.4/No.2
p. 137−147
2383-3076
Vol.4/No.2
p. 21−34
2383-3076
Vol.4/No.2
p. 35−57
2383-3076
Vol.4/No.2
p. 1−20
2383-3076
Vol.4/No.2