عنوان مقاله [English]
Due to the high heat capacity of the seas, there is a significant effect on land areas climate fluctuations. The impact of sea surface temperature (SST) on the amount of rainfall was not limited to the coasts and also affect regions far from the sea. So recognize the correlation between SST and precipitation will have a significant role in predicting drought and wet areas that are affected by fluctuations in SST.
In this study, Relationship monthly fluctuations Mediterranean sea surface temperature With fluctuations monthly precipitation northwest Iran(Includes six provinces, West Azerbaijan, East Azerbaijan, Kurdistan, Zanjan, Kermanshah, Hamedan) were studied. For this purpose, after determine the Colder and warmer periods Monthly temperature of the water level of the Mediterranean Compared to normal temperature, during the 33-year-old(1982-2014), The correlation coefficient between Monthly temperature water level and monthly precipitation was obtained in each province. In periods when there was a significant relationship between water temperature and precipitation, The rate of increase / decrease in precipitation under the influence of temperature fluctuations were studied. The results showed the effect of water temperature on regional precipitation variation, Is different in time and location and the precipitation spring show the highest correlation with water temperature. In the months of autumn, the sea water temperature was colder than usual and precipitation and water temperature has a significant relationship, precipitation is reduced. But was not observed Significant relationship between warmer than usual water temperatures and fluctuating precipitation. in winter In most cases, the water temperature was colder than usual and Have a high correlation with precipitation, Increased rainfall has caused and In no previous period there was no Significant relationship between the warmer than normal water temperatures and Fluctuation of precipitation this season. Also there is a significant Relationship between cooler than normal water temperatures in the winter months and Reducing precipitation in the spring. In the spring only in april warmer than usual water temperatures
On the whole the sea with a significant level of more than 96%, increased precipitation caused In the entire study area and in other cases, warmer than usual water temperatures with decreasing precipitation and it is colder than usual Has been associated with increased precipitation. it should be noted results of this study show a causal relationship and To justify this relationship need to examine atmosphere is dynamic and synoptic.