1- Department of climatology, Faculty of Geographical Sciences, Kharazmi University, Tehran, Iran.
2- PhD in Climatology, Iran Water Resources Management Company, Iran Water Data and Information Office, Modeling and Innovation Department, Tehran, Iran. ,meysam.toulabi@gmail.com
2- PhD in Climatology, Iran Water Resources Management Company, Iran Water Data and Information Office, Modeling and Innovation Department, Tehran, Iran. ,
Abstract: (32 Views)
| This study was conducted to investigate and forecasting the types of inversions and their intensity in Isfahan city. In this study, radiosonde data from Isfahan station for 00:00 GMT (3.5 local time) during the years 2010 to 2020 were used. The results showed that 46% of Isfahan inversions are radiative, 7% are frontal, and 47% are subsidence. Due to the subsidence of air under the zonal high pressure, the share of subsidence inversions is higher. The average intensity of inversions showed that the most severe inversion with a coefficient of 0.023 is radiative. In terms of intensity rank, moderate inversions with 7% and severe inversions with 64% have the lowest and highest frequency in Isfahan city. The correlation results showed that there is a positive correlation between the intensity of inversion with temperature, pressure and layer thickness with coefficients of 0.910, 0.968 and 0.591, and a negative correlation between the intensity of inversion and height with coefficient -0.967. In fact, with the increase in the temperature of the inversion layer, the thickness of the inversion layer has increased, and as a result, the intensity of inversions in Isfahan has also increased; The results of the regression models showed that the main pattern for the frequency of inversions in Isfahan will continue. According to this analysis, the strong seasonal pattern of inversions in Isfahan will continue at least until 2030. Also, stability in the number is not expected, but the total number of inversions per year will increase or decrease significantly. The fluctuations will be around a constant average (about 110 events per year). The results showed that the winter season will remain critical in terms of inversion frequency. The months of January and February will continue to be the most critical period in terms of the number and intensity of inversions, which has a direct impact on Isfahan air pollution. |
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