Spatial patterns of changes in frequency of occurrence and intensity of pluvial clouds (lower atmosphere) in Iran

Abstract

One of the major crises that affect the communities, climate change is and will exacerbate climate risks. The clouds and climatic parameters associated with them, as well as important input in climate change prediction models, are considered. All clouds have the potential climate change and hydrologic cycle is headed. And any changes in value and their parameters can be the beginning of a chain of reactions and changes in the distribution of weather elements is another time and place. The aim of this study was to investigate changes in cloud abundance of low-level atmosphere in the Iran. To achieve this goal, first low-level clouds atmosphere Iran calculating the frequency of occurrence and when it was provided series Then, using the Mann - Kendall trend was the time of occurrence of low clouds. The spatial pattern of low-level cloud changes was analyzed. The results showed that the highest frequency of occurrence of low-level clouds atmosphere of Iran, in the north and northwest of the country, But each has a different spatial distribution of low-level clouds. The frequency of occurrence of low-level clouds in most provinces has been significant changes. And 23 stations of the 30 study sites have a significant change in the confidence level is 0.05 percent, The changes also showed that most stations (17 stations 30 stations) have incremental changes are. Spatial differences also showed that changes in the North East and the South West to Isfahan and Qom decreasing trend And Trends in other parts of the country there is a significant increase in clouds of the low-level atmosphere. The early 1990s and the late 1980s when point mutations in the series are low-level clouds.

Keywords

• clouds
• climate change
• lower atmosphere
• iran