synoptic analysis of the relation between daily precipitation change in southern coasts of iran and variability of sea level pressure

in the current attempt, the relation between precipitation change in southern coasts of iran and sea level pressure data of ncep / ncar database were investigated through correlation method using environment to circulation approach in the period of 1960-2004. after calculating the correlation matrix between the percipitation amount and pressure, the precipitation-pressure correlation map for each station was plotted. comparison and analysis of the resulting maps revealed that regardless of minor differences, this area has a two-modeled nature. results showed that precipitation in southern coasts of iran is more affected by two precipitation- pressure patterns of asian monsoon and sudanese, which is coincided with the location of installation india monsoon circulation and sudanese monsoon regime. on the other hand, the results of this research showed that precipitation change and its occurrence at southern coasts of iran in sea level is affected by predominance of the monsoon regime on southern of asia and sudanese circulation pattern. hence, precipitation change in southern coasts of iran is more related to the decrease and increase of pressure rate in action field of this pattern.