Analysis of geopotential altitude trend on Iran under the influence of climate change

Given the importance of climate change in the structure of the Earth is trying to understand more about how climate change events for granted .Trend variations in large-scale atmospheric systems, such as subtropical high pressure, play a significant role in climate change. In this study, to achieve the objectives, mid-level atmospheric geopotential altitudedata were employedbased on the European Center Database of Atmospheric Medium-Term Forecasting. The data have a spatial resolution of 1 * 1 degree of curveand are collected on a daily average. The statistical period of the research ranges from 1980 to 2018 for Iran and included 266 cells. Mann-Kendall trend test was used to investigate the geopotential altitude trend on Iran. The results of the study indicate the height of the subtropical high pressure to the south of the Mediterranean, the Arabian Peninsula, Red Sea and around Iran. The results showed that the atmospheric geopotential altitudeon Iran in June, July and August has an increasing (positive) trend which is at the significant levelof 1.96.Indeed, the decreasing trend of geopotential altitude in the eastern and southeastern regions of Iran is worth considering. Moreover, in all the investigated months, Iranian atmosphere altitude in the central, western and northwestern regions had an upward trend, which is generally influenced by the high-pressure subtropical level. These changes cause anomalies in climatic patterns of regions. The survey also showed that continuing pressure subtropical the stack on top of ever increasing trend in the region is significant. Considering the large-scale atmospheric patterns associated with land surface changes of climate, where can be caused by climate change.