Journal of Meteorology and Atmospheric Science

Investigating the role of East Asian monsoon upper troposphere circulation and Tibetan Plateau forcing in the formation of the summer anticyclone in the middle troposphere of Iran.

https://doi.org/10.22034/jmas.2023.366974.1189
Volume 5, Issue 2 - Serial Number 2
September 2023
Pages 81-97
Journal of Meteorology and Atmospheric Science

Document Type : Original Article

Author

hassan haji mohamadi
Abstract
The mechanism of anticyclone formation and the role of different forces in their formation are challenging topics in the field of atmospheric sciences. For this purpose, the role of summer monsoon circulation and Tibetan Plateau forcing in the formation of mid-troposphere summer anticyclone over Iran was investigated. In order to obtain the main mechanism of anticyclone in the subtropical region of Iran during a period of 40 years (1981-2020), dynamic quantities of relative Vorticity, relative Vorticity advection, Velocity potential, Stream function and divergent wind were used. The results indicated that with the beginning of summer in the Northern Hemisphere, at the levels of 200 and 100 hpa, the strongest anticyclone in the Northern Hemisphere has spread in the area between the Tibetan Plateau and the Iranian Plateau, and the maximum intensity of this anticyclone is in the months of July and August and in terms of location in these two months, they have a higher extent. With the onset of monsoon activity and the formation of an energy source in East Asia, the mass resulting from deep convection in East Asia flows from East to West in a wide range from West Asia to most parts of Africa and forms an energy sink.

Keywords

summer monsoon
Sink and Source energy
Tibetan Plateau
Iran subtropical anticyclone
Subjects

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