Investigation of Temperature Inversion Trend in Boundary Layer in mountainous cities and Their Relation with ENSO, Case study: Shiraz

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Article Type:
Case Study (دارای رتبه معتبر)
Abstract:

The present study aims to investigate the frequency distribution of monthly, seasonal and annual temperature in the boundary layer of Shiraz. For this purpose, radiosonde data downloaded at 3.5 local time during 1394 -1380 (5478 days) from the University of Wyoming web site. Then, the height of the meteorological station of Shiraz (1491 m) was determined as the base level of the inversion of the boundary layer of air, and The Top of the Inversion layer was selected to the geopotential surface of 700 hp (an average of 1.5 km from the lower layer above the surface) as the study space. The results showed that October and November are the highest and July's low frequency of inversion days. On this basis, the autumn, winter, spring and summer seasons were the most days of inversion, respectively. Also, the results on the annual scale showed that the frequency of inversion days was increasing. As the average monthly increase in the frequency of inversion days, the air temperature in the first 5 years (1390 -1394) compared to the first 5 years (1385 -1389) was twice as high as 5 years in comparison with the first 5 years (1380 -1384). The annual average annual average also showed that 73% of the year (267 days) of Shiraz was faced with inversion phenomenon. The most intense inversion of temperature in the air interface have occurred in January, this clearly demonstrates the role of night cooling in the intensification of inertia of the temperature of the boundary layer of the air .

Language:
Persian
Published:
Journal of Geographical Studies of Mountainous Areas, Volume:3 Issue: 12, 2023
Pages:
1 to 18
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