Evaluation of Temperature Inversion Indicators in Boundary Layer(Case Study: Tehran, Iran)

• Main Authors: Taghi Tavousi, Nasrin Hossein Abadi
• Format: Article
• Language: fas
• Published: Afarand Scholarly Publishing Institute 2017-09-01
• Series: تحقيقات جغرافيايی
• Subjects: temperature inversion; inversion intensity; inversion depth; tehran.
• Online Access: http://georesearch.ir/article-1-219-en.html
• ISSN: 1019-7052; 2538-4384

Atmospheric stability resulting from temperature inversion is one of the main problems of the metropolises such as Tehran especially in cold periods of the year. This article aims to study the temperature inversion in Tehran from 2010 to 2014 in daily, monthly, and seasonal time scales. Some parameters were studied base height and top height, base and top layer temperature, temperature difference between two mentioned layers, layer depth of inversion, and air pressure in base and top layers. Then the days with dynamic and radiation inversions were studied. Using various indicators, the days were classified according to inversion intensity ranging from weak to very intense. The results showed that the number of days with temperature inversion was 231 (206 days of radiation inversion and 25 days of dynamic inversion).Most temperature inversions occurred in summer while the least happened in spring. Very intense inversions, however, occurred in winter and fall. The results indicate that temperature inversion was observable in most of the days especially in summer. Temperature inversions are less frequent and more intense in winter. Studying inversion days showed which can be highly effective in atmospheric stability in closer layers to the Earth surface especially in cold seasons.