On the relation between relative vorticity centers of action in the Middle East and air temperature in Iran

Recognizing the interactions of the large-scale components of atmospheric circulation creates an appropriate capacity to examine the regional climate variability and improve description of land-atmosphere connections. Assessment Iran vulnerability to climate fluctuations is very important. Part of this recognition will be achieved by assessing the components of the atmospheric circulation. The relative vorticity distribution is an important index of synoptic motion in mid latitudes. Regions of positive relative vorticity are associated with cyclonic storms in the Northern Hemisphere. Thus the distribution of relative vorticity is an excellent diagnostic for weather analysis. Vorticity, the microscopic measure of rotation in a fluid, is a vector field defined as the curl of velocity. Relative vorticity is a measure of the intensity and direction of spin in a circular movement, which is performed by a unit volume of air around the vertical axis perpendicular to the plane over which this rotation occurs. Relative vorticity is a good quantity for studying atmospheric changes, because it presents the main order of magnitude of daily cyclonicity or anticyclonicity.