Journal of Meteorology and Atmospheric Science

Study of the Atlantic and Mediterranean storm tracks based on Rossby wave activity flux in the dry and wet periods of spring 2018 and 2008 in Iran

Volume 1, Issue 1 - Serial Number 1
Spring 2018
Pages 1-12
Journal of Meteorology and Atmospheric Science

Document Type : Original Article

Authors

F. Bahrami 1
A. Ranjbar Saadatabadi 2
A.H. Meshkatee 1
Gh.A. Kamali 3

1 Science And Research Branch, Islamic Azad University, Tehran, Iran

2 Institute of Meteorology and Scienceو Tehran, Iran

3 science and research branch of Islamic azad university, Tehran, Iran

Abstract
In this study,rossby wave activity flux,in order to investigate budget,direction and intensity of the incoming rossby waves,into the Middle East and Iran and its relation to positive precipitation anomaly in April and October of 2018 were used.dry period(April and May 2008)was selected to compare with the wave flux in the wet period.precipitation data from the Weather station of the country's Meteorological Organization were used to calculate precipitation anomaly,NCAR / NCEP data to compute wave activity flux.Results showed that two factors convergence(divergence)of the wave activity and the sources and sinks of energy,manage the energy budget in the Mediterranean region.In wet period,wave activity is stronger and there is an area of intense wave divergence on the east of the Atlantic ocean.The waves from the Atlantic ocean,by passing the Mediterranean Sea covers Iran.In the dry period,in the west of the Atlantic,the eddy activity is more weaker than the other.So the convergence of wave stream function on the Atlantic Ocean and also the weakness of the rossby on this area,followed by the divergence of wave stream function on the east of the Mediterranean Sea and of course Iran,and also the lack of appropriate eddy activity in this region, has caused drought in this period.

Keywords

Rossby wave activity flux
wave stream function
Mediterranean storm track
precipitation anomaly

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