The Trends in Annual Average Temperatures and Precipitations in Turkey and Relationship with NAO (1975-2009)

The climate is both the most important element, thet determines the creatures living area and properties and self-source thet provides all living needs for human beings. Because of human activities, especially industrial activities, the world have got warmer globally,all components of hydrologic circuit have been effected by this warming. In this situation, called the change of climate, while the danger of drought have been increasing by the decrease in rains in some areas, the increases in rains have been seen in some areas. One of common points declared in the national and international studies is that our country is one of the risky area being affected by the global climate change. In this study, the trends in annual average temperatures and precipitations and relationship with NAO in the period of 1975-2009 were analysed according to data provided by 110 Turkish meteorological stations. The trends in annual average temperatures and precipitations according to the linear trend model were prepared and direction and degree of relationship between them were examined by the Pearsen Correlation analysis. Potential changes of temperature and precipitation in the future were examined with Simple Linear Regression and the maps of trends of annual average temperature and precipitation were prepared according to 110 Turkish meteorological stations. According to the findings, there is an upward trend of 1,01 degrees C in annual average temperatures for the period of 1975-2009 in Turkey. Annual average temperatures will be expected to rise 0,3 degrees C by 2024. There is an upward trend of 0,43 mm in annual average precipitations according to data of 110 Turkish meteorological stations, but this increase is due to the stations having high increasing trend in The Black Sea coasts. There is a downward trend of 21,6 mm in annual average precipitation in Turkey, except for the regions of Black Sea and Marmara, that constitute the 74 percent of the land.