The Stable Isotope Characteristics of Precipitation in the Middle East Highlighting the Link between the Köppen Climate Classifications and the ?18O and ?2H Values of Precipitation

The Middle East is faced with a water shortage crisis due to its semiarid and arid climate. In this paper, precipitation as an important part of the cycle was evaluated in 43 stations across using stable isotope technique study parameters which influence content precipitation. First, stepwise regression model applied determine main geographical climatological factors affecting isotopes Secondly, also used simulate values Furthermore, notable climatic variations East, sampling were classified into six groups based on Köppen climate zones. Significant observed each zone. Finally, meteoric line developed for dry wet periods average studied stations. lines showed lower slope compared GMWL higher air temperature relative humidity global conditions. To conclude, contents significant temporal spatial East.