Precipitation is a climatic elements that have temporal - spatial distribution. In this research database of Global Precipitation Climatology Centre (GPCC) with a resolution 0.5×0.5 degree for 50 year is used, that was constituted with dimensions of 12800*600. Temporal data are on the columns and pixels (spatial data) located on the rows. The results show an increasing trend in spring and fall but in summer and winter precipitation trend has been decreased. The most amount of precipitation is located in the northern parts of the Black Sea and Mediterranean Sea, Southeast Asia, southern coast of the Caspian and Central Zagros Mountains. Most of Middle East (about %95) have not trend and only in some parts of Kazakhstan, Afghanistan, Pakistan ,central Iran, and areas in lower-latitude have positive trend and some East and northwest parts of Iran and some parts of Middle East also have decreasing trend of precipitation. The highest percent of area of precipitation trend gradient is 0 to 0.5.
 

In this study, for statistical studies to determine days whit temperature above 50°c, the reanalyzed data of the nineteenth, twentieth and twenty-first centuries for the West Asia region (12 to 42.5 degrees north latitude and 36 to 63.5 degrees east longitude) have been used. Also, for synoptic analysis of extreme temperatures, HGT, AIR, UWND, VWND and SLP data were used. To conduct this research, first, extreme temperature data above 50° during the last 185 years were extracted for the study area in the hot season (June, July, August and September). After identifying days whit above 50° c, HGT data at the level of 500 hp were extracted and WARD clustering was applied. Finally, after identifying the clusters, the days whit the highest temperature that occurred in each cluster were selected for synoptic analysis. It can be said that all altitude patterns of geopotential meters (HGT) at the level of 500 hp show that the main cause of occurrence and distribution of temperatures above 50°c in West Asia are high-altitude (high-pressure) subtropical West Asia, which due to the location of its high-pressure core on the Zagros and sometimes the Arabian Peninsula, it has been referred to as the Zagros or Saudi high-pressure in terms of interest and taste. What is certain, however, is the high-pressure independent identity of the subtropical Azores, which has been mentioned in numerous articles and is known to be the main cause of the heat in the West Asian region, especially Iran.

 Water is a strategic and rare resource that has been severely limited in recent years due to various national and transnational variables and has severely affected the areas of security, stability, development and prosperity in countries. The high impact of water in the aforementioned areas has placed water at the center of foreign policy and hydropolitical relations of many countries, including South West Asia. In recent years, despite the issue of the water crisis and its role in the relations between Iran and Iraq in scientific, political and media circles, the dimensions of this issue remain unknown and different interpretations have been given. The current research, which is of a research nature and the required inputs were collected in a library method with the aim of obtaining a qualitative understanding of the dimensions and angles of the hydropolitical relations between Iran and Iraq, is based on the fact that, in addition to identifying the content and methodological features, the research gaps To identify the existing in this field with qualitative meta-analysis method. Using the qualitative meta-analysis method, this research has examined 34 researches conducted in the period of 2014-1402 in the form of domestic scientific-research articles, dissertations and articles in prestigious international journals. The results of the research showed that a comprehensive study has not been conducted that has investigated and analyzed the various dimensions of the hydropolitical relations between Iran and Iraq. In this regard, the lack of accurate and real data and the weakness of the theoretical-cognitive foundations of the research are among the shortcomings of the research conducted in the field of relations between the two countries.