عنوان مقاله [English]
Precepitable Water (PW) is one of the most important Variables studied in meteorology and cloud physics, which plays an important role in predicting air and rainfall. In this study, AIRS's sensor AQUA satellite Precepitable Water data were used with monthly and spatial time steps of 1° x 1° for the statistical period of 2003-2019. The AIRS sensor is one of six Aqua satellite sensors designed to help researchers change climate and improve air forecasting. The sensor has a very wide range of resolution, which is tens of times more powerful than similar devices before it. The extracted data, after qualitative control and pre-processing, were used by specialized software such as ENVI, ArcGIS and Grads to build raster, vector and information tables based on the geographical boundary of Iran. The data used are numerical and their numerical values are the amount of Precepitable Water in millimeters (mm) per pixel or cell that was estimated for annual, sesonal and monthly observations. The average Precepitable water in the atmosphere of Iran is 12.7 mm, which explains the low amount of Precepitable water in the atmosphere of Iran compared to the average Precepitable water of the global atmosphere (21.6 mm). On the other hand, the amount of Precepitable water in the Iranian atmosphere does not have a time and homogeneous distribution. So that among the studied months, the highest amount is related to July and the lowest amount is related to January. Among the seasons, the highest amount of Precepitable Water was estimated in summer and the lowest in winter. Meanwhile, local factors, such as remoteness and proximity to moisture sources, play an important role in the distribution of Precepitable Water in the atmosphere prevailing in Iran. According to observations, The atmosphere prevails over the heights (especially the Zagros Mountains) has very low Precepitable Water concentration and in contrast to the coastal shores of the Persian Gulf, Oman Sea and Caspian Sea due to having huge sources of moisture nutrition, in the region with the highest rainfall They are located in Iran. However, the amount of Precepitable Water in the Iranian atmosphere is more dependent on topography, distance, and proximity to moisture sources than on latitude (as opposed to global distribution). On the other hand, the Precepitable Water behavior of the Iranian atmosphere over time indicates that its trend is increasing.In addition to being a form of feedback on rising temperatures across Iran, the increasing trend of Precepitable Water is also important in terms of climate change.